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Image Subject Name Scientific Name Description
1593081 twolined chestnut borer Agrilus bilineatus Recently thinned oak stand.  thinning corresponded with an intense summer drought and forest tent caterpillar defoliation resulting in extensive tree mortality. 
1593087 eastern larch beetle Dendroctonus simplex Tamarack infested with eastern larch beetle, bark removal in late winter due to woodpecker probing. 
5492745 Diplodia tip blights Diplodia spp. grazing, red pine growing along the edges of the pasture are being impacted by Diplodia.   
5492746 Diplodia tip blights Diplodia spp. Red pine growing along the edges of the pasture are being impacted by Diplodia.
5492761 fire Damaged red pine, Pagami Creek fire
5492762 fire Pagami Creek fire, damaged jack and red pine
5492765 garlic mustard Alliaria petiolata
5492763 fire Pagami Creek fire, damaged red pine
5492747 quaking aspen Populus tremuloides
5492740 red maple Acer rubrum early spring
5492741 red maple Acer rubrum early spring
5492742 quaking aspen Populus tremuloides early spring
5492749 paper birch Betula papyrifera
5492750 white pine weevil Pissodes strobi
5492751 white pine weevil Pissodes strobi
5492753 balsam fir Abies balsamea
5492752 balsam fir Abies balsamea
5492743 quaking aspen Populus tremuloides early spring
5492744 quaking aspen Populus tremuloides early spring
5492748 quaking aspen Populus tremuloides
5492728 American basswood Tilia americana Buds
5492729 American basswood Tilia americana Bud
5492726 ash flower gall mite Eriophyes fraxiniflora Ash flower galls on black ash, late winter.
5492727 ash flower gall mite Eriophyes fraxiniflora Ash flwower galls scattered in the crowns of black ash trees.
5492739 burl and decay
5492736 lakes and ponds spring ephemeral pond
5492738 burl and decay
5492734 lakes and ponds spring ephemeral pond
5492735 lakes and ponds spring ephemeral pond
5492733 yellow marsh marigold Caltha palustris
5492768 black root rot Xylaria polymorpha
5492757 red pine Pinus resinosa
5492755 jack pine Pinus banksiana
5492756 jack pine Pinus banksiana
5492737 burl and decay
1593014 pruning (general)
5492722 illegal dumping Garbage dumps in woods.
5492723 illegal dumping Garbage dump in woods
5492724 eastern white pine Pinus strobus Large dominant white pine growing with paper birch and treambling aspen. 
5492725 eastern white pine Pinus strobus Large dominant white pine growing with paper birch and trembling aspen.
5492769 barred owl Strix varia
5492767 black root rot Xylaria polymorpha
5492766 black root rot Xylaria polymorpha
5492760 garlic mustard Alliaria petiolata
5492764 garlic mustard Alliaria petiolata
5492758 garlic mustard Alliaria petiolata
5492759 garlic mustard Alliaria petiolata
5492732 yellow marsh marigold Caltha palustris
5492730 partridgeberry Mitchella repens
5492731 partridgeberry Mitchella repens
5443519 prescribed fire Fire char on Pinus strobus Sawdust accumulating at the tree base from unknown woodborer attack high in the tree
1593024 fire Red pine plantation that had recently burned.  
5486528 May-June beetles Phyllophaga spp. white grub feeding damage, removal of fine roots on a red pine seedling.
5486516 May-June beetles Phyllophaga spp. Red pine root damage
5486518 May-June beetles Phyllophaga spp. Dead seedlings growing in dense grass, killed by white grub feeding on root system
5486524 May-June beetles Phyllophaga spp. white grub feeding damage, removal of fine roots on a pine seedling.
5486525 May-June beetles Phyllophaga spp. white grub feeding damage, removal of fine roots on a pine seedling.
5486526 May-June beetles Phyllophaga spp. white grub feeding damage, removal of fine roots on a pine seedling.
5486519 May-June beetles Phyllophaga spp. White grubs, different age and size classes.
5486520 May-June beetles Phyllophaga spp. Single larva
5486521 May-June beetles Phyllophaga spp. Single larva
5486522 May-June beetles Phyllophaga spp. Seedlings with damaged root systems
5486523 May-June beetles Phyllophaga spp. root feeding on pine seedling
5486517 May-June beetles Phyllophaga spp. red pine seedling root damage
5486527 May-June beetles Phyllophaga spp. white grub feeding damage, removal of fine roots on a red pine seedling.
1593052 white pine blister rust Cronartium ribicola Branch flag
5424277 spotted joe pye weed Eutrochium maculatum Flowering Joe-Pye-weed
5483249 yellow-bellied sapsucker Sphyrapicus varius
5483248 yellow-bellied sapsucker Sphyrapicus varius
5468304 mourning cloak butterfly Nymphalis antiopa
1484011 oak bullet gall Disholcaspis quercusglobulus galls
1398069 acorn-plum gall Amphibolips quercusjuglans galls
1398218 eastern pine gall rust Cronartium quercuum Branch gall
1593002 rodents Winter rodent feeding at the base of young sugar Maple trees
1398272 forest tent caterpillar Malacosoma disstria Molted skins of early instar forest tent caterpillars
1457017 oak bullet gall Disholcaspis quercusglobulus Bullet galls formed on the twigs of a young white oak. Also found on neighboring burr oak. Galls secrete a honeydew substance that attracts insects such as wasps, bees and flies.
1398082 Eriophyid mite leaf gall
1593011 white pine weevil Pissodes strobi Older weevil attack that killed the existing terminal when the tree was at the height of damaged whorl.  The dead terminal was replaced by severl competing laterals that created a dense cluster of branches at the whorl. 
1593026 pileated woodpecker Dryocopus pileatus Large holes excavated by a pileated woodpecker in a jack pine.
1593057 eastern dwarf mistletoe Arceuthobium pusillum witches' brooms inblack spruce trees along the edge of a dwarf misteltoe "pocket".
1398065 galls Leaf galls. Collected in Ramsey Co., MN.
1398253 poplar twiggall fly Hexomyza schineri Twig galls
1593020 white pine weevil Pissodes strobi Boards freshly cut from a eastern white pine log.  The distorted wood grain and embedded knots illustrate damage caused by an older weevil attack that killed the existing terminal at that whorl. Logs originated on the Menominee Indian Reservation, logs were cut at the Forest Products Lab, Madison, WI.     
1593058 eastern dwarf mistletoe Arceuthobium pusillum Dwarf mistletoe infected black spruce stand, northern MN
1593060 snow and ice damage (snow load) snow pull, damage to branches on a young tree.
1593073 snow and ice damage (snow load)
1593080 eastern dwarf mistletoe Arceuthobium pusillum Witches' brooms
1593082 post oak grasshopper Dendrotettix quercus Photo taken on an aspen leaf but, feeding damage was mostly observed on neighboring black and northern pin oak
1593085 eastern larch beetle Dendroctonus simplex Gallery pattern of the eastern larch beetle under the bark of an infested tamarack. 
1593090 robber flies Robber fly adult with captured prey item (smaller fly).  Robber fly had landed on a Forest Service map. 
1593091 robber flies Natural enemy, predatory fly, adult robber fly with prey item, another fly species.  Robber fly had landed on a Forest Service map.
1593092 net-winged beetles Calopteron spp. Adult beetle
5443536 human caused injury names carved in outer bark on paper birch  
1398264 forest tent caterpillar Malacosoma disstria Pupal cases attached to a cabin in northern MN
1593031 black pineleaf scale Dynaspidiotus californica Scale infestation on needles
1593040 black pineleaf scale Dynaspidiotus californica Scale infestation on needles
1593044 flower spider Misumena vatia Natural enemy
1593088 red pine Pinus resinosa Large red pine stems, northern MN.
1593089 pine tip root weevil Hylobius rhizophagus Branch flagging on a root tip weevil infested tree. 
1479027 eastern white pine Pinus strobus Mature white pines growing on a richer northern hardwood site in northern lower Michigan
1479023 canker rot Phellinus everhartii
1593000 wind Wind damage in an older red pine plantation, Chequamegon-Nicolet National Forest, WI. 
1593001 porcupine Erethizon dorsatum Porcupine damage to Lodgepole Pine
1593003 perennial lupine Lupinus perennis Photo shows a small patch of flowering lupine growing in Jackson, Co. WI. 
1593009 wind Wind Damage in an older highd ensity red pine plantation, Chequamegon-Nicolet Nation Forest.
1593013 hail Hail wounds that were exposed by removing bark of a damaged trembling aspen stem.
1593027 hail Open wounds caused by an intense hail storm. 
1593032 carpenter ants Camponotus spp. Honeycomb type damage characteristic of carpenter ants. 
1593046 gilled polypore Lenzites betulina top view of sporocarp
1593056 black spruce Picea mariana Photo shows a grouping of black spruce in the foreground with tamarack, a common associate, in the background.  The clumped growth on some of the black spruce is not uncommon.   
1593004 cooley spruce gall adelgid Adelges cooleyi Wool-covered adelgids on their alternate host, Douglas-fir. 
1593036 metalic wood-boring beetless Chalcophora spp. Larvae found in a dead red pine log
1593037 metalic wood-boring beetless Chalcophora spp. Larvae found in a dead red pine
1593016 redheaded pine sawfly Neodiprion lecontei Feeding damage on a red pine sapling
1593053 white pine weevil Pissodes strobi Classic early attack symptoms in the terminal of an infested eastern white pine. 
1593055 eastern spruce gall adelgid Adelges abietis Older galls
1593083 native elm bark beetle Hylurgopinus rufipes
1593079 pine engraver Ips pini boring dust
1593007 red pine Pinus resinosa Red pine (Pinus resinosa) regeneration under Diplodia infected overstory
1593066 European pine sawfly Neodiprion sertifer Early spring defoliation of older needles on an ornamental Mugo pine.
1593074 white spruce Picea glauca Row thinning in white spruce
1593006 spruce bud scale Physokermes piceae
1593067 Saratoga spittlebug Aphrophora saratogensis Heavily damaged red pine growing in a dense stand of Sweetfern, the nymphal host of the Saratoga spittlebug
1593062 eastern white pine Pinus strobus
1593069 red pine Pinus resinosa Red pine plantation, photo illustrates row thinning. 
1593070 red pine Pinus resinosa Large mature red pine
1593075 redheaded pine sawfly Neodiprion lecontei
1593076 redheaded pine sawfly Neodiprion lecontei Group of sawfly larvae
1593077 redheaded pine sawfly Neodiprion lecontei
1593078 redheaded pine sawfly Neodiprion lecontei
1593084 American basswood Tilia americana Newly emerging leaves, late May.
1593063 eastern white pine Pinus strobus Young eastern white pine, northern Minnesota. This White Pine plot was established by Forest Service Research and S&PF to look at whote pine weevil and blister rust impacts.
1593008 red pine Pinus resinosa red pine plantation
1593005 eastern spruce gall adelgid Adelges abietis Odler galls caused by eastern spruce gall adelgid
1593010 jack pine budworm Choristoneura pinus pinus Jack Pine budworm on understory white pine, Chippewa County, Michigan. 
1593012 white pine weevil Pissodes strobi Terminal and laterals beging to wilt (die) due to an active infestation of white pine weevil.  
1593015 Ips engraver beetles Ips spp. Pockets of Ips beetle attacks in a small 30-year-old red pine plantation, Eau Claire Co., WI.  Photo taken during an intense summer drought in July 1998.   
1593018 eastern white pine Pinus strobus Photo of the crown on a larger tree
1593023 red pine Pinus resinosa Older red pine plantation with a balsam fir understory.  Photo also shows a woods road. 
1593025 sweetfern Comptonia peregrina Alternate host for Saratoga spittlebug. 
1593028 purple loosestrife Lythrum salicaria Landscape planting with purple loosestrife.
1593030 eastern tent caterpillar Malacosoma americanum Tent formed by eastern tent caterpillar.
1593039 sunrise
1593035 pine engraver Ips pini Pine engraver mortality showing up as a pocket of recently killed red pine trees. 
1593041 sunsets Dead Birch in Silhouette at sunset
1593034 sunsets Sunset on a northern WI lake. 
1593045 red turpentine beetle Dendroctonus valens Turpentine beetle attack on a fire damaged stem of red pine.
1593049 pine bark adelgid Pineus strobi Main stem coated with cottony-like pine bark adelgids.
1593072 drought Scots pine Christmas wilting due to drought and intense summer heat.  Tree also had signs of poor planting (J-root).  Summer 1998. 
1593017 perennial lupine Lupinus perennis Host plant for the engangered Karner blue butterfly
1593019 eastern white pine Pinus strobus Large mature eastern white pine
1593022 red pine Pinus resinosa Large mature red pine, Itasca State Park, MN
1593065 eastern white pine Pinus strobus Big eastern white pine, Itasca State Park, Minnesota
5424264 nuclear polyhedrosis virus Nucleopolyhedrovirus N/A Group of sawfly larvae killed by polyhesdrosis virus; larvae were on Red pine, Pinus resinosa  
1593059 snow and ice damage (snow load) snow pull caused by heavy wet snow
5202074 scarlet elfcup Sarcoscypha austriaca Common name of scarlet cup, found in April, northern Hardwood site, Dunn Co., WI
1593048 pine engraver Ips pini Nuptial chamber, egg eniches and egg gallery. 
1479011 Noctuid moth Acronicta lanceolaria Caterpillar photo
1479010 Noctuid moth Acronicta lanceolaria caterpillar
5424265 nuclear polyhedrosis virus Nucleopolyhedrovirus N/A Virus killed larvae
5424266 Giant ichneumon wasp Megarhyssa spp. Adult Megarhyssa with ovipositor extended
5424267 Giant ichneumon wasp Megarhyssa spp. Female with ovipositor inserted through the bark of an American elm
5468289 red admiral Vanessa atalanta Adult nectaring on a purple coneflower
5468291 European buckthorn Rhamnus cathartica Fruit in winter
5468299 Hericium fungus Hericium coralloides Large fruiting bodies at the base of a sugar maple in northern Wisconsin. 
5468221 eastern ash bark beetle Hylesinus aculeatus exit holes
5468222 eastern ash bark beetle Hylesinus aculeatus exit holes
5468223 eastern ash bark beetle Hylesinus aculeatus exit holes
5468233 quaking aspen Populus tremuloides Young, high density aspen stand.  This type of density is common following a commercial clearcut in northern WI.
5468238 quaking aspen Populus tremuloides Older quaking aspen with a conifer understory of balsam fir and white cedar.  Photo was taken in northeast Minnesota. 
5468272 bottomland hardwoods Swamp hardwoods, Mississippi River floodplain.  River birch and silver maple.
1398059 post oak grasshopper Dendrotettix quercus Jackson County, Wisconsin
5468219 green ash Fraxinus pennsylvanica Lower stem girdling caused by a rope.
5468220 green ash Fraxinus pennsylvanica Lower stem girdled by a rope.
5443556 entomophagus fungi Entomophaga maimaiga dead gypsy moth larvae killed by E. maimaiga
5468281 spotted knapweed Centaurea stoebe un-opened flower-head
5468319 eastern white pine Pinus strobus young eastern white pine invading a red pine plantation
5468216 ash borer Podosesia syringae
5468232 quaking aspen Populus tremuloides young sucker stand of quaking aspen
5468308 European buckthorn Rhamnus cathartica Late October, buckthorn stays green late into the fall. 
5468309 European buckthorn Rhamnus cathartica Understory buckthorn infestation, buckthorn stays green late into the fall
5468240 quaking aspen Populus tremuloides Mature aspen stand, northern Minnesota
5468253 silver maple Acer saccharinum Lowland hardwood forest, Mississippi River floodplain
5468254 woodpeckers Woodpecker activity on an American basswood
5468255 woodpeckers Pileated woodpecker excavation
5468256 silver maple Acer saccharinum Mississippi River floodplain
5468260 rivers and streams Silver maple growing along a stream
5468261 silver maple Acer saccharinum Silver maple growing along a stream in a floodplain forest
5468262 silver maple Acer saccharinum Tree growing in the Mississippi River floodplain
5468263 silver maple Acer saccharinum Silver maple growing along a stream, shore erosion
5468264 silver maple Acer saccharinum Trees growing along a stream
5468265 silver maple Acer saccharinum Silver maple dominated floodplain forest along the Mississippi River
5468266 silver maple Acer saccharinum Silver maple dominated floodplain forest along the Mississippi River
5468267 silver maple Acer saccharinum Silver maple dominated floodplain forest, Mississippi River floodplain
5468268 silver maple Acer saccharinum Floodplain forest
5468269 wind Wind damage, floodplain forest, shallow root system
5468271 silver maple Acer saccharinum Mississippi River flood plain
5468273 river birch Betula nigra Mississippi River flood plain
5468274 river birch Betula nigra Mississippi River flood plain
5468270 silver maple Acer saccharinum floodplain tree
5468317 red pine Pinus resinosa plantation
5468229 quaking aspen Populus tremuloides
5468239 quaking aspen Populus tremuloides mature aspen
5424281 eastern gray squirrel Sciurus carolinensis Sugar maple bark chewed off by gray squirrels, northern WI site, late winter. 
5424283 eastern gray squirrel Sciurus carolinensis Early spring/late winter in Wisconsin.  Squirrels have chewed the bark off branches of sugar maple. 
5468294 boxelder bug Boisea trivittata Adults and nymphs
5468295 boxelder bug Boisea trivittata Adults and nymphs
5468296 boxelder bug Boisea trivittata Adults and nymphs
5468297 boxelder bug Boisea trivittata Adults and nymphs
5468217 ash borer Podosesia syringae
5468282 spotted knapweed Centaurea stoebe un-opened flower head
5468298 Hericium fungus Hericium coralloides
5468275 river birch Betula nigra
5468310 eastern arborvitae Thuja occidentalis
5468237 quaking aspen Populus tremuloides
5468236 quaking aspen Populus tremuloides
5468324 smooth patch of oak Aleurodiscus oakesii
5468307 pine gall weevil Podapion gallicola
5468306 pine gall weevil Podapion gallicola
5468234 quaking aspen Populus tremuloides
5468235 quaking aspen Populus tremuloides
5468230 quaking aspen Populus tremuloides
5468228 quaking aspen Populus tremuloides
5468226 quaking aspen Populus tremuloides
5468227 quaking aspen Populus tremuloides
5468218 ash borer Podosesia syringae
5468290 European buckthorn Rhamnus cathartica
5468292 pine false webworm Acantholyda erythrocephala
5468293 pine false webworm Acantholyda erythrocephala
5468244 garlic mustard Alliaria petiolata large patch of flowering garlic mustard
5468245 garlic mustard Alliaria petiolata flowering plants
5468246 garlic mustard Alliaria petiolata
5468252 garlic mustard Alliaria petiolata
5468249 garlic mustard Alliaria petiolata Large patch of flowering garlic mustard
5468250 garlic mustard Alliaria petiolata Large patch of flowering garlic mustard
5468251 garlic mustard Alliaria petiolata
5468248 garlic mustard Alliaria petiolata large patch of flowering garlic mustard
5468276 yellow marsh marigold Caltha palustris group of flowering plants
5468277 yellow marsh marigold Caltha palustris flowering plant
5468278 yellow marsh marigold Caltha palustris group of flowering plants
5468279 yellow marsh marigold Caltha palustris flowering plant
5468241 garlic mustard Alliaria petiolata carpet of seedling garlic mustard plants
5468242 garlic mustard Alliaria petiolata carpet of seedling garlic mustard plants
5468243 garlic mustard Alliaria petiolata bolting second year plant
5468318 red pine Pinus resinosa thinning planned, tree paint
5468320 red pine Pinus resinosa plantation
5468321 red pine Pinus resinosa plantation
5468322 red pine Pinus resinosa
5468323 red pine Pinus resinosa plantation
5468288 baldfaced hornet Dolichovespula maculata nest
5468280 spotted knapweed Centaurea stoebe single flower
5468283 Scots pine Pinus sylvestris field of sheared trees
5468284 Scots pine Pinus sylvestris field of sheared trees
5468285 ink spot leaf blight Ciborinia whetzelii
5468286 ink spot leaf blight Ciborinia whetzelii
5468257 silver maple Acer saccharinum Large den tree
5468258 black willow Salix nigra Single tree with leaves
5468247 garlic mustard Alliaria petiolata flowering plant in foreground, background has 1st-year plants
5468301 greater fringed gentian Gentianopsis crinita plant with multiple flowers
5468325 smooth patch of oak Aleurodiscus oakesii single tree
5468327 smooth patch of oak Aleurodiscus oakesii
5468328 smooth patch of oak Aleurodiscus oakesii multiple trees
5468316 closed bottle gentian Gentiana andrewsii
5468259 black willow Salix nigra single tree with leaves
5468231 quaking aspen Populus tremuloides
5468224 quaking aspen Populus tremuloides
5468225 quaking aspen Populus tremuloides
5468302 western conifer-seed bug Leptoglossus occidentalis
5468303 western conifer-seed bug Leptoglossus occidentalis
5468305 mourning cloak butterfly Nymphalis antiopa
5468326 smooth patch of oak Aleurodiscus oakesii
5468300 greater fringed gentian Gentianopsis crinita
5468311 butterfly milkweed Asclepias tuberosa
5468312 butterfly milkweed Asclepias tuberosa
5468313 turk's-cap lily Lilium superbum
5468314 turk's-cap lily Lilium superbum
5468315 closed bottle gentian Gentiana andrewsii
5468287 ink spot leaf blight Ciborinia whetzelii
1457008 black ash decline General decline in wetland black ash, regionally widespread in northern MN, WI and MI in 2003-2005. The cause is undetermined though drought is likely in this instance. Tree mortality did occur, crown dieback and decline was common. Photo taken near Cloquet, MN, 2005.
1398058 galls caused by mites
5443558 entomophagus fungi Entomophaga maimaiga Dead gypsy moth caterpillar, killed by Entomophaga maimaga (fungal pathogen).    
5443559 entomophagus fungi Entomophaga maimaiga Dead gypsy moth caterpillar killed by Entomophaga maimaiga (fungal pathogen).
5443560 entomophagus fungi Entomophaga maimaiga Dead gypsy moth caterpillar killed by Entomophaga maimaiga (fungal pathogen).   
5443561 entomophagus fungi Entomophaga maimaiga ??Dead gypsy moth caterpillar killed by Entomophaga maimaigo (fungal pathogen)
5443562 entomophagus fungi Entomophaga maimaiga Dead gypsy moth caterpillar killed by Entomophaga maimaiga (fungal pathogn). 
5443563 entomophagus fungi Entomophaga maimaiga Dead gypsy moth caterpillar killed by Entomophaga maimaga (fungal pathogen). 
5424273 common milkweed Asclepias syriaca Flowering common milkweed
5369999 great blue heron Ardea herodias Great blue heron and nest
5370013 metalic wood-boring beetles Dicerca spp. Mating pair of adults on the bark of a red pine
5443527 eastern white pine Pinus strobus Fall needle color on white pine
5443518 red turpentine beetle Dendroctonus valens Pitch tube at tree base
5443566 Japanese beetle Popillia japonica
5443567 Japanese beetle Popillia japonica
5443520 ash heart rot Perenniporia fraxinophila
5443521 ash heart rot Perenniporia fraxinophila
5443522 ash heart rot Perenniporia fraxinophila
5443523 ash heart rot Perenniporia fraxinophila
5443524 ash heart rot Perenniporia fraxinophila
5443525 ash heart rot Perenniporia fraxinophila
5443526 ash heart rot Perenniporia fraxinophila
5443550 larch sawfly Pristiphora erichsonii Characteristic curved twig caused by damage from egg laying
5443551 larch sawfly Pristiphora erichsonii Characteristic curved twig caused by damage from egg laying  
5443552 aspen blotchminer Phyllonorycter apparella Leaf mining
5443553 aspen blotchminer Phyllonorycter apparella Leaf mining
5443554 aspen blotchminer Phyllonorycter apparella
5443555 aspen blotchminer Phyllonorycter apparella Leaf mining
5443574 eastern cottontail Sylvilagus floridanus Rabbit feeding damage, late winter, on a crab apple
5443575 eastern cottontail Sylvilagus floridanus Rabbit feeding damage, late winter, on a crab apple.
5443576 eastern cottontail Sylvilagus floridanus Rabbit feeding damage, late winter, on a crab apple.
1457023 drought Dead paper birch, northern Wisconsin, 1990. Birch mortality was widespread following a regional drought in the late 1980's.
1388008 tamarack Larix laricina Fall colors. In landscape setting. Blaine, MN 1996.
5443538 eastern hemlock Tsuga canadensis Young hemlock regeneration under a northern hardwood stand
5443528 introduced pine sawfly Diprion similis
5443529 introduced pine sawfly Diprion similis
5443530 introduced pine sawfly Diprion similis
5443531 introduced pine sawfly Diprion similis
5443532 introduced pine sawfly Diprion similis
5443533 eastern white pine Pinus strobus Fall needle color change
5443534 eastern white pine Pinus strobus Fall needle color change
5443539 Japanese beetle Popillia japonica Skeletonizing on Buckeye, August 2011
5443540 Japanese beetle Popillia japonica Skeletonizing on European linden, August 2011
5443541 Japanese beetle Popillia japonica Skeletonizing on European linden, August 2011
5443542 Japanese beetle Popillia japonica Skeletonizing on European linden . August 2011
5443543 Japanese beetle Popillia japonica Skeletonizing on European linden. August 2011
5443544 Japanese beetle Popillia japonica Defoliation on a buckeye. August 2011
5443545 Japanese beetle Popillia japonica Defoliation on a buckeye. August 2011
5443546 Japanese beetle Popillia japonica Defoliation on European linden. August 2011
5443547 Japanese beetle Popillia japonica Defoliation on European linden. August 2011
5443548 common hackberry Celtis occidentalis Open grown hackberry in a highway rest area
5443549 common hackberry Celtis occidentalis Open grown hackberry in a highway rest area
5443564 Japanese beetle Popillia japonica
5443565 Japanese beetle Popillia japonica
5443557 eastern chipmunk Tamias striatus
5443570 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5443571 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5443572 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5443573 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5443568 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5443569 eastern gray squirrel Sciurus carolinensis Late winter feeding damage on sugar maple by eastern gray squirrels. March 2010
5424280 eastern gray squirrel Sciurus carolinensis Late winter bark stripping by grey squirrels, northern WI site. 
5424282 eastern gray squirrel Sciurus carolinensis Bark chewed off, sugar maple was the only tree damaged in a mixed hardwood stand.  March 2010, late winter, in northern WI. 
5424285 hemlock borer Phaenops fulvoguttata Overwintering larva within the bark of an infested hemlock trees
1457044 eastern pine seedworm Cydia toreuta Overwintering larva found in a dissected red pine cone. Larvae feed on maturing seed.
1388006 wind Straight line wind damage in quaking aspen, northern Wisconsin, Chequamegon National Forest near the town of Drummond, July 1999.
1457040 red pine cone beetle Conophthorus resinosae Egg gallery in a red pine cone.
1457006 black ash decline General decline in wetland black ash stands. Cause undetermined, though regional drought conditions are the most likely cause. Widespread tree mortality as well as branch dieback. Common across northern MN and WI in 2003-2005. Photo taken near Cloquet, MN, 2005.
1398140 eastern pine seedworm Cydia toreuta
1398189 frost and winter injury (general) Poor quality landscape tree with a frost crack.
1398013 two-spotted lady beetle Adalia bipunctata Photo taken in early spring, Minnesota, balsam fir was infested with balsam twig aphid, Mindarus abietinus
1398118 red pine cone beetle Conophthorus resinosae Bisected cone with an adult female in her egg gallery
1398122 webbing coneworm Dioryctria disclusa Single larva inside of a bisected cone. Larva removes frass and keeps the cavity in the cone clean
1398124 cone midge Resseliella spp. feeding on the inside of cone scale. Grant Co. WI.
1398145 red pine cone borer Eucosma monitorana Pinned adult
1398168 mountain pine beetle Dendroctonus ponderosae Pitch tubes. Medicine Bow Mountains, southeast Wyoming
1398245 forest tent caterpillar Malacosoma disstria
1398221 pine bark adelgid Pineus strobi White coated bark on a pole-sized white pine. Waushara County, WI
1398246 forest tent caterpillar Malacosoma disstria Aspen defoliation along a lakeshore, northern MN.
1398244 forest tent caterpillar Malacosoma disstria Pupal case tied into foliage, northern MN.
1398137 cone midge Resseliella spp. Larvae found beneath the savcle of an infested cone. Grant Co. WI.
1398188 frost and winter injury (general) severe basal damage
1457028 eastern tent caterpillar Malacosoma americanum Multiple tents. Photo taken in Jackson Co., WI.
1398120 leaffooted pine seed bug Leptoglossus corculus
1398012 multicolored Asian lady beetle Harmonia axyridis Anoka Co., MN
1388028 polyphemus moth Antheraea polyphemus
1388023 pecan leaf casebearer Acrobasis juglandis Silk tube with embedded frass produced by the larval stage.
1398009 pine root collar weevil Hylobius radicis Scots and red pine showing various stages of damage from the pine root collar weevil. Damage is often heaviest along plantation edges where grass competition is intense. Photo taken in Jackson Co. Wisconsin
1398170 tamarack Larix laricina Fall color. Itasca State Park, MN.
2121086 conifer sawfly Gilpinia frutetorum Photo taken on the Sand Dunes State Forest, Sherburne County, MN 2005
1457010 eastern white pine Pinus strobus Photo taken in northern MN
1457024 bronze birch borer Agrilus anxius Callus tissue formed by the larval feeding gallery, visible on the main stem. Photo taken in Moundsview, MN.
1398136 cone midge Resseliella spp. Two cone midge larvae found beneath the savcle of an infested cone. Grant Co. WI.
1199034 white pine weevil Pissodes strobi Emergence hole
1199003 eastern pine gall rust Cronartium quercuum Globose galls in central Wisconsin
1199006 large aspen tortrix Choristoneura conflictana
1398201 Armillaria root rots Armillaria spp. 40 year old recently killed white spruce with bark removed at the tree base. Chequamegon National Forest, 2004
1398203 spruce decline Recently killed white spruce on the Chequamegon national Forest, Wisconsin. Mortality agent apparently a combination of drought, spruce budworm and armillaria root disease.
1398090 emerald ash borer Agrilus planipennis Dead trees in a landscape setting. Ann Arbor, MI, June 2005
1199030 pine bark adelgid Pineus strobi
1199029 pine bark adelgid Pineus strobi Pine bark adelgid infestation on the bark of an eastern white pine
1199031 beech scale Cryptococcus fagisuga
1199023 spruce bud scale Physokermes piceae Mature scales on a branch
1398275 aspen blotchminer Phyllonorycter apparella Blotch mines. This leaf miner is common in northern MN, WI and MI.
1398234 poplar borer Saperda calcarata Young aspen stem with a sap bleeding wound caused by larval tunneling activity. Chippewa Co, WI 2005
1398166 hummingbird clearwing Hemaris thysbe Adult moth at rest, photo taken at Willow River State Park, St. Croix Co., WI
1398159 elm sawfly Cimbex americana Pink coloration is not common, most larvae are green to yellow in color.
1398117 pine webworm Pococera robustella web nest
1398057 leafhopper Typhlocyba albicans Stippling damage on leaf in early summer. Hiawatha National Forest, MI
1398040 sugar maple borer Glycobius speciosus Characteristic larval gallery pattern on an open wound site, main stem. Photo taken in northern Wisconsin
1398034 cecropia moth Hyalophora cecropia Photo taken in Anoka County, Minnesota.
1398036 forest tent caterpillar Malacosoma disstria Late instar larval mass on the stem of an aspen tree. Northern Minnesota.
1398029 red pine shoot moth Dioryctria resinosella
1457022 white pine blister rust Cronartium ribicola Aecial spore stage of white pine blister rust on main stem of a young tree.
1398091 emerald ash borer Agrilus planipennis
1398093 emerald ash borer Agrilus planipennis Boulevard tree with heavy woodpecker activity. Ann Arbor, MI, 2004.
1398028 red pine shoot moth Dioryctria resinosella Characteristic pitch tube on a red pine shoot.
1398041 sugar maple borer Glycobius speciosus External damage on live standing tree
1398084 leafcurl ash aphid Meliarhizophagus fraxinifolii Distorted foliage due to an aphid infestation on green ash. Photo taken in Minnesota.
1398085 ash plant bug Tropidosteptes amoenus Stippling damage on ash leaflet
1398095 oak webworm Archips fervidana Webbed leaves
1398071 walnut shoot moth Acrobasis demotella
1398038 elm sawfly Cimbex americana Pink coloration
1398016 balsam twig aphid Mindarus abietinus Twisted needles on new growth, early spring. Photo taken in Anoka County, MN
1398224 pine bark adelgid Pineus strobi Whitewashed appearance on a heavily infested stem. Waushara County, Wisconsin
1398031 locust leafminer Odontota dorsalis Leaf mines
1398032 bronze birch borer Agrilus anxius Adult beetle and D-shaped exit holes
1398042 cherry scallop shell moth Rheumaptera prunivorata tied foliage
1398230 white pine weevil Pissodes strobi Board showing internal damage due to an old white pine weevil attack, large knots and twisted wood grain.
1398202 spruce decline White spruce in northern Wisconsin dying of a general stand decline, cause apparently drought related, 2004, Chequamegon National Forest
1398191 spruce needleminer Taniva albolineana
1398223 pine bark adelgid Pineus strobi White cottony masses on the bark
1398255 large aspen tortrix Choristoneura conflictana Empty pupal case protruding from a silk-teid aspen leaf.
1398116 cone midge Resseliella spp. Larvae feeding inside of a red pine cone scale. Grant Co., WI
1199001 pine root collar weevil Hylobius radicis To base.
1199022 spruce needleminer Taniva albolineana
1199004 eastern pine gall rust Cronartium quercuum Globose galls typical of the pine-oak and pine-pine gall rusts on jack pine.
1388002 cecropia moth Hyalophora cecropia on the stem of a river birch, Betula nigra. Blaine, MN (Anoka County)
1398160 eastern tiger swallowtail Papilio glaucus
1398158 monarch butterfly Danaus plexippus on purple cone flower
1398233 white pine weevil Pissodes strobi twisted, old white pine
1398167 pine engraver Ips pini Pocket of recently killed older red pine. Superior National Forest, MN
1398192 spruce needleminer Taniva albolineana Hollowed-out dead needles webbed onto a white spruce branch. St. Paul, MN
1398256 large aspen tortrix Choristoneura conflictana
1398198 white-lined sphinx Hyles lineata Late instar caterpillar
1398152 dragonflies and damselflies mating. Wyoming
1398121 webbing coneworm Dioryctria disclusa Round entrance hole in a developing red pine cone
1398247 forest tent caterpillar Malacosoma disstria Late-instar caterpillar
1398273 forest tent caterpillar Malacosoma disstria Late instar larvae massed on a young aspen tree. northwest Wisconsin, 2001.
1398139 white pine cone borer Eucosma tocullionana Frass extruding from infested cone. Early August at Oconto River seed orchard, Nicolet National Forest in northern Wisconsin
1398194 spruce budworm Choristoneura fumiferana Dead and declining white spruce in northern MN following a spruce budworm outbreak
1398274 aspen leafminer Phyllocnistis populiella small track mines. Central Minnesota
1398254 large aspen tortrix Choristoneura conflictana Upper Peninsula of Michigan
1398265 birch leafminer Fenusa pusilla Brown blistered leaves on a paper birch, late spring in northern Minnesota
1199032 elm sawfly Cimbex americana Pink coloration is uncommon. Most larvae are yellow or green.
2121084 conifer sawfly Gilpinia frutetorum Photo taken on the Sand Dunes State Forest, Sherburne County, MN.
2121090 red-belted fungus Fomitopsis pinicola Red belted fungus, conk on a dead black spruce stem, photo taken in northern MN, St. Louis Co.
2121088 red-belted fungus Fomitopsis pinicola External conk on a dead black spruce stem. Photo taken in St. Louis County, Mn, 2005
1457015 sugar maple borer Glycobius speciosus Open-faced canker at an old attack site. Larval gallery is visible etched on the sapwood.
1457009 eastern white pine Pinus strobus Large white pine, northern MN.
1457007 black ash decline Black ash decline symptoms, summer 2004, near Cloquest, MN
1457031 blackheaded ash sawfly Tethida barda Group of larvae on the under-side of an ash leaflet.
1388036 fir broom rust Melampsorella caryophyllacearum Cloquet Forestry Center, Univ. of MN
2121089 red-belted fungus Fomitopsis pinicola Red velvet fungus, conk on a dead black spruce stem, photo taken in northern MN, St. Louis Co.
2121085 conifer sawfly Gilpinia frutetorum Photo taken on the Sand Dunes State Forest, Sherburne County, MN 2005
1398258 leafminer flies
1457041 red pine cone beetle Conophthorus resinosae Adult female in an egg gallery, developing red pine seed can be seen at the bottom of the image.
2121094 introduced pine sawfly Diprion similis Photo taken in Sept, 2005, Ramsey Co., MN
1457021 white pine blister rust Cronartium ribicola Main stem canker girdling the main stem of a young tree.
1457042 webbing coneworm Dioryctria disclusa Infested red pine cone. Granular frass visible at the base of the cone. A large entry hole can be found near the cone base.
1398055 greenstriped mapleworm Dryocampa rubicunda Single late-instar caterpillar
1457027 eastern tent caterpillar Malacosoma americanum Single tent with caterpillars. Photo taken in Jackson, Co., WI.
2121093 introduced pine sawfly Diprion similis In a defensive posture. Photo taken in Sept. 2005 in Ramsey Co., MN.
1457020 white pine blister rust Cronartium ribicola Fading eastern white pine with a main stem rust canker at the tree base.
1398094 emerald ash borer Agrilus planipennis
1199021 spruce needleminer Taniva albolineana
1388007 northern red oak Quercus rubra Menominee Indian Reservation, northern Wisconsin. Tree located in a shelterwood harvest unit.
1457001 aspen blotchminer Phyllonorycter apparella Blotch mines on aspen leaves in northern Minnesota
1398027 locust leafminer Odontota dorsalis Individual leaf mine
1457026 monarch butterfly Danaus plexippus Single caterpillar on a common milkweed leaf. Milkweed flower is visible.
1398047 dogwood sawfly Macremphytus tarsatus Typical resting posture
1398037 twolined chestnut borer Agrilus bilineatus Dead and dying branches in the upper crown of a white oak, early evidence of two-lined chestnut borer attack. Photo taken in St. Paul, MN
1457013 red pine Pinus resinosa Male strobili prior to pollen release
1398228 white pine weevil Pissodes strobi Evidence of an old weevil attack on a 20-25 yr old white pine in Wisconsin.
1457011 currant Ribes spp.
1398231 shelterwood Shelterwood in eastern white pine, Menominee Indian Reservation, WI
1199019 white pine cone borer Eucosma tocullionana
1457034 red pine Pinus resinosa Developing cones in late spring.
1457002 Eutypella canker Eutypella parasitica Large main stem canker on a northern Wisconsin sugar maple.
1398063 blackheaded ash sawfly Tethida barda Group of later instar larvae on an ash leaflet
1398026 aspen blotchminer Phyllonorycter apparella Common in the northern parts of MN, WI and MI
1398096 oak webworm Archips fervidana Two larvae in a frass filled nest
1398193 spruce gall midge Mayetiola piceae
1398030 red pine shoot moth Dioryctria resinosella
1457032 forest tent caterpillar Malacosoma disstria Group of late-instar larvae on the main stem of an aspen tree, northern Wisconsin, summer 2003.
1199035 white pine weevil Pissodes strobi
1398043 mountain-ash sawfly Pristiphora geniculata
1388015 hemlock borer Phaenops fulvoguttata Single larva located under the bark of a mature, recently killed eastern hemlock. Brunet Island State Park, Chippewa County, Wisconsin.
1398242 forest tent caterpillar Malacosoma disstria Multiple late instar larvae feeding on an ash leaf.
1388018 eastern tiger swallowtail Papilio glaucus Nectaring on a blazing star.
1388011 blue spruce Picea pungens Showing classic blue coloration. Inniswood Metro gardens in Westerville, Ohio.
1388034 basswood thrips Neohydatothrips tiliae
1388027 pine spittlebug Aphrophora cribrata Spittle
1388017 syrphid or flower flies
1388024 balsam twig aphid Mindarus abietinus Twisted (distorted) new foliage
1398081 oak apple gall Amphibolips spp. developing gall.
1398266 bronze birch borer Agrilus anxius Adult and a D-shaped emergence hole.
1398033 bronze birch borer Agrilus anxius
1398075 butternut woolyworm Eriocampa juglandis
1398011 balsam gall midge Paradiplosis tumifex needle galls
1398219 eastern pine gall rust Cronartium quercuum Globose gall typical of the pine-oak and pine-pine gall rusts on jack pine. Black River State Forest, Jackson Co., WI.
1398064 Eutypella canker Eutypella parasitica Classic "cobra head" shaped stem
1398232 pine engraver Ips pini Pocket of dead older red pine killed by Ips pini,
1398206 larch sawfly Pristiphora erichsonii Small group of larvae
1398128 red pine shoot moth Dioryctria resinosella
1199018 red pine cone borer Eucosma monitorana Oval entrance holes on the face of a developing cone.
1398080 ash and privet borer Tylonotus bimaculatus Single larva and cross-section of a larval gallery in ash. Adults reared to confirm identification. Material collected in Hennepin Co., MN in a dying ash tree.
1398017 syrphid or flower flies Adult syrphid ovipositing on a balsam fir twig infested with balsam woolly adelgid. Anoka Co., MN, late May.
1398181 boreal owl Aegolius funereus Winter
1398101 gypsy moth Lymantria dispar First instar larvae
1398079 ash and privet borer Tylonotus bimaculatus Single larva and the cross-section of a larval gallery. Adults were reared to confirm identification. Larvae collected from a dying ash tree on the Minneapolis (MN) campus of the University of Minnesota (Hennepin Co., MN).
1398150 baldfaced hornet Dolichovespula maculata
1398211 red pine cone beetle Conophthorus resinosae Pitch tube on twig
1398173 pink lady's-slipper Cypripedium acaule
1398180 common snapping turtle Chelydra serpentina
1199017 webbing coneworm Dioryctria disclusa
1398021 frost and winter injury (general) Balsam fir Christmas trees damaged in early spring. Plantation was in a cold air pocket and winter injury was the likely culprit. Photo taken near Antigo, Wisconsin (NE Wisconsin).
1398177 northern hardwoods Fall color in northern Wisconsin, paper birch, and red maple
5424270 oak apple gall Amphibolips spp. Two galls, one with a exit hole. 
5424271 oak apple gall Amphibolips spp. Two galls, one with an exit hole.
5424272 oak apple gall Amphibolips spp. Two galls, one with an exit hole
5424274 common milkweed Asclepias syriaca Flowering common milkweed
5424275 common milkweed Asclepias syriaca flowering common milkweed
1398179 boreal owl Aegolius funereus
1398210 red pine cone beetle Conophthorus resinosae
1398018 syrphid or flower flies
1398178 perennial lupine Lupinus perennis Flowering wild lupine, the larval host plant for the endangered Karner blue butterfly. Photo taken in Jackson County Wisconsin in late May.
1398184 American robin Turdus migratorius feeding nestlings
1398114 white pine cone beetle Conophthorus coniperda Dead cones hanging on tree
1398269 river birch Betula nigra Blaine, MN
1398271 forest tent caterpillar Malacosoma disstria Various caterpillar instars and molted skins on the stem of a young aspen tree, northern MN
1398130 red pine Pinus resinosa Male strobili prior to pollen release
1398127 webbing coneworm Dioryctria disclusa Attack site at the base of a red pine cone.
1199012 Zimmerman pine moth Dioryctria zimmermani Pitch masses are generally concentrated at the branch whorl.
1199007 large aspen tortrix Choristoneura conflictana
1199009 bronze birch borer Agrilus anxius Adult bronze birch borer and D-shaped emergence holes
1199010 bronze birch borer Agrilus anxius
1398115 white pine cone beetle Conophthorus coniperda Infested cones of various size. Oconto River Seed Orchard, Nicolet National Forest, Wisconsin
1199011 birch leafminer Fenusa pusilla Leaf mines
1398100 gypsy moth Lymantria dispar First instar larvae on an egg mass. Photo taken on the Nicolet National Forest, Wisconsin, 2002.
1199036 white pine weevil Pissodes strobi Stem deformity caused by an earlier attack
1398002 desication (wind burn) Drying injury evident above the snow-line on a Scots pine Christmas tree, Phot taken in Minnesota.
1457036 red pine cone borer Eucosma monitorana Infested cone, small oval entrance holes with fine frass are visible on the face of this cone.
1398217 black pineleaf scale Dynaspidiotus californica Mugo pine needles infested with black pineleaf scales. Photo taken in Moundsview MN, stressed ornamental mugo pine.
1398102 gypsy moth Lymantria dispar Female with egg mass
1398103 gypsy moth Lymantria dispar Female with egg mass.
1199025 Scleroderris canker of pine and spruce Gremmeniella abietina Death of lower branches.
1398251 American aspen beetle Gonioctena americana Small group of larvae feeding on the underside of an aspen leaf.
1199024 spruce gall midge Mayetiola piceae
1199016 pine engraver Ips pini Exit holes
1398112 white pine cone borer Eucosma tocullionana Attacked mature cones, early August. Oconto River Seed orchard, Nicolet National Forest, WI
1398182 bald eagle Haliaeetus leucocephalus Immature perched on a dead snag.
1398237 forest tent caterpillar Malacosoma disstria Egg mass
1398186 eastern arborvitae Thuja occidentalis
1398238 bronze poplar borer Agrilus liragus Winding gallery pattern showing on the outer bark
1398214 jack pine budworm Choristoneura pinus pinus late-instar larvae
1398066 woolly elm aphid Eriosoma americanum Leaf gall
1398053 Dutch elm disease Ophiostoma ulmi Advanced crown symptoms.
1398250 Taphrina flower fungus Taphrina johansonii Infected catkins
1398157 eastern tiger swallowtail Papilio glaucus Nectaring at a blazing star
1388033 leafhopper Typhlocyba albicans Michigan's Upper Peninsula
1388030 chainspotted geometer Cingilia catenaria
1388025 red pine shoot moth Dioryctria resinosella Pitch tube on a shoot infested with a single larva
1388022 oak shothole leafminer Agromyza viridula Shot hole pattern in leaf. Central lower Michigan
1398154 monarch butterfly Danaus plexippus
1388026 fall webworm Hyphantria cunea Web. Web formed by fall webworm on cherry, central Minnesota, and larvae, August.
1388012 eastern arborvitae Thuja occidentalis Larger, open-grown tree. Michigan's Upper peninsula.
1388009 white trillium Trillium grandiflorum In northern Wisconsin hardwood stand.
1388010 blue spruce Picea pungens With "classic: blue coloration.2003.
1388032 Dutch elm disease Ophiostoma ulmi Flagging branches throughout the crown.
1388021 twolined chestnut borer Agrilus bilineatus Early signs of attack. Dead and dying branches in the upper crown.
1199002 pine root collar weevil Hylobius radicis Various stages of damage in a mixed red and Scots pine stand. Damage concentrated along stand edge where grass is competing with the trees.
1388013 eastern arborvitae Thuja occidentalis growing along a trout stream in northern Wisconsin. Nicolet National Forest.
1388005 wind Straight line wind damage in older red and white pine, northern Wisconsin, Chequamegon National Forest near Drummond, Wisconsin, July 1999.
1457018 white pine blister rust Cronartium ribicola Branch flag (infected branch that has died) high in the crown of a large eastern white pine. Rust infections in the upper crowns of trees generally indicate a high local risk for infection.
1398098 oak tatters
1398051 beech scale Cryptococcus fagisuga Trunk covered with scale. Michigan's upper peninsula, 2004.
1398227 white pine weevil Pissodes strobi Newly emerged adult white pine weevil and exit holes on a red pine terminal. Red pine attack is rare.
1398171 gray tree frog Hyla versicolor
1388003 gypsy moth Lymantria dispar NPV infected larva
1398049 beech scale Cryptococcus fagisuga Beech scale covering the bark of a larger American beech. Upper Peninsula of Michigan, 2002
1388004 snow and ice damage (snow load) Snapped following an ice storm and subsequent wind. Chequamegon National Forest, Wisconsin, 1991
1388020 boreal owl Aegolius funereus
2121099 red pine shoot moth Dioryctria resinosella Infested shoot that has died, characteristic damage in late summer. Photo taken in July 2005
1388031 basswood leafroller Pantographa limata rolled leaf
1398267 bronze birch borer Agrilus anxius D-shaped exit holes
1398270 river birch Betula nigra Peeling bark on a 8-10 year old tree
2121098 white pine weevil Pissodes strobi Terminal portion of a Jack pine killed by white pine weevil larval feeding. This is relatively common in Michigan and Wisconsin. Photo taken  July 2005
1484021 stink bugs stink bug nymph feeding on sawfly larvae
1388035 introduced basswood thrips Thrips calcaratus Characteristic early spring damage on trees attacked. Damaged buds may abort or produce distorted, shredded leaves. Introduced basswood thrips is a common basswood defoliator in northern Wisconsin, northern Michigan and Minnesota. Tree mortality is rare but growth loss does occur.
1457003 forest tent caterpillar Malacosoma disstria NPV Virus killed
1398259 birch leafminer Fenusa pusilla Early leaf mines
1199008 hail
5370012 gypsy moth Lymantria dispar Caterpillar
5424284 hemlock borer Phaenops fulvoguttata Single larva of hemlock borer.March, 2010
5424286 hemlock borer Phaenops fulvoguttata Single larva of the hemlock borer.March 2010
5424287 hemlock borer Phaenops fulvoguttata Close-up of a larva, late winter, under the bark of eastern hemlock.March, 2010
5424288 hemlock borer Phaenops fulvoguttata Infested hemlock.  Woodpecker probing has stripped the outer bark off of this infested tree.  The red under-bark is very visible against snow in late winter. March 2010
5424289 hemlock borer Phaenops fulvoguttata Infested tree.  Woodpecker probing has stripped the bark off this infested tree.  The reddish inner-bark is very visible against a snowy background. March 2010
5202072 scarlet elfcup Sarcoscypha austriaca Common name of scarlet cup, found in April, northern hardwood site, Dunn Co., WI
5202073 scarlet elfcup Sarcoscypha austriaca Common name of scarlet cup, found in very early spring in a northern hardwood stand, Dunn Co., WI
5424245 Eriophyid mites Eriophyes spp. Felt-like leaf gall on river birch caused by an eriophyid mite in the genus Eriophyes. 
5424276 redosier dogwood Cornus sericea
5424241 emerald ash borer Agrilus planipennis Early-stage emerald ash borer gallery
5424251 larch sawfly Pristiphora erichsonii Group of larvae
5424252 larch sawfly Pristiphora erichsonii single larva
5424253 larch sawfly Pristiphora erichsonii single larva
5424254 larch sawfly Pristiphora erichsonii single larva
5424278 sweet joepyeweed Eupatorium purpureum Flowering joe pye weed, late-summer flower most often in wet meadows and riparian corridors. 
5424242 green ash Fraxinus pennsylvanica Landscape green ash, front yard of a home in St. Paul, MN
5424243 elm leafminer Kaliofenusa ulmi Leafminer larvae inside leaf mines
5424244 elm leafminer Kaliofenusa ulmi Blister like leaf mine, larvae can be seen inside the mines.  
5424246 Eriophyid mites Eriophyes spp. Felt-like leaf gall on river birch caused by a eriophyid mite, genus Eriophyes. 
5424247 spiny looper Phigalia titea Larva
5424248 spiny looper Phigalia titea caterpillar
5424249 fletcher scale Parthenolecanium fletcheri Scale bodies on white-cedar foliage, mid-summer
5424250 fletcher scale Parthenolecanium fletcheri Scale bodies on foliage of northern white-cedar
5424261 European pine sawfly Neodiprion sertifer Feeding damage to red pine by European pine sawfly, older needles are consumed, new-foliage is not eaten. 
5424255 European pine sawfly Neodiprion sertifer Classic old-foliage defolaition event by European pine sawfly.  New year foliage is undamaged. 
5424256 European pine sawfly Neodiprion sertifer European pine sawfly defoliation, early spring feeding on previous years needles.
5424257 European pine sawfly Neodiprion sertifer Cluster of larvae
5424258 European pine sawfly Neodiprion sertifer cluster of larvae
5424259 European pine sawfly Neodiprion sertifer Early season defoliation by European pine sawfly on a red pine.  Larvae eat only previous-years needles. 
5424260 European pine sawfly Neodiprion sertifer cluster of larvae
5424279 eastern chipmunk Tamias striatus adult close-up
5202063 green ash Fraxinus pennsylvanica Fall color, street tree. Photo taken in the city.
1479029 red pine Pinus resinosa Bald eagle perched atop an old red pine, Seney National Wildlife Refuge, Michigan
5369967 bloodroot Sanguinaria canadensis
5369968 bloodroot Sanguinaria canadensis
5369970 bloodroot Sanguinaria canadensis multiple flowering plants
5369996 star-flower Trientalis borealis leaves and flower in a northern hardwood stand
5369997 star-flower Trientalis borealis leaves and flower in a northern hardwood stand
5370016 sawflies Caliroa spp. larvae feeding on the lower surface of a bur oak leaf
5369985 forest tent caterpillar Malacosoma disstria Cluster of larvae on the stem of a crab apple tree, 2007
5370006 pig (domestic) Sus scrofa (domestic type) Content pigs in a mud bath.  Wisconsin woodlot damaged by livestock
5369971 bloodroot Sanguinaria canadensis
5203001 woolly apple aphid Eriosoma lanigerum Distorted leaf; photo taken in early June.
5369986 European pine sawfly Neodiprion sertifer Colony of larvae
5369987 European pine sawfly Neodiprion sertifer clump of feeding larvae
5369988 balsam twig aphid Mindarus abietinus Damage, twisted foliage in early spring
5369989 balsam twig aphid Mindarus abietinus Damage, twisted needles in early spring
5369990 balsam twig aphid Mindarus abietinus Damage, twisted needles in early spring
5369992 star-flower Trientalis borealis
5369993 bluebead-lily Clintonia borealis Photo taken in a northern hardwood stand
5369995 bluebead-lily Clintonia borealis photo taken in a northern hardwood stand
5369998 great blue heron Ardea herodias Adult and nest, 2007
5370001 great blue heron Ardea herodias Adult and nest, 2007
5370002 great blue heron Ardea herodias Adult and nest, 2007
5370004 great blue heron Ardea herodias Nest and adults, 2007
5370005 pig (domestic) Sus scrofa (domestic type) Content pigs in a mud bath.  Wisconsin woodlot damaged by livestock
5370007 pig (domestic) Sus scrofa (domestic type) Content pigs in a mud bath.  Wisconsin woodlot damaged by livestock
5370015 sawflies Caliroa spp. Group of larvae feeding on the undersurface of a bur oak leaf
5370017 sawflies Caliroa spp. feeding larvae, lower surface of a bur oak leaf
5370018 sawflies Caliroa spp. Larvae feeding on the lower surface of a bur oak leaf
5370019 sawflies Caliroa spp. Larvae feeding on the lower surface of a bur oak leaf
5370020 sawflies Caliroa spp. Larvae feeding on the lower surface of a bur oak leaf
5370021 sawflies Caliroa spp. feeding injury as it appears on the uppper surface of the leaf
5370023 black swallowtail Papilio polyxenes
5203016 clinker polypore Inonotus obliquus Photo taken in banning State park, Pine Co., MN
5369963 bloodroot Sanguinaria canadensis flower and leaf; early spring in northern WI
5369964 bloodroot Sanguinaria canadensis Flower and leaf
5369969 bloodroot Sanguinaria canadensis early spring in northern WI
5369973 garlic mustard Alliaria petiolata leaves and small flowers; Invasive plant, photo taken in Ramsey Co., MN
5369974 garlic mustard Alliaria petiolata single plant, flower; Invasive plant, photo taken in Ramsey Co., MN
5369975 garlic mustard Alliaria petiolata Invasive plant, photo taken in Ramsey Co., MN
5369976 garlic mustard Alliaria petiolata Invasive plant, photo taken in Ramsey Co., MN
5369977 garlic mustard Alliaria petiolata flower stage; Invasive plant, photo taken in Ramsey Co., MN
5369978 pink lady's-slipper Cypripedium acaule photo taken in a red pine plantation, Eau Claire Co., WI
5369979 tamarack Larix laricina
5369980 tamarack Larix laricina Cone - early development
5370008 gypsy moth Lymantria dispar Caterpillar, late instar
5370009 gypsy moth Lymantria dispar Caterpillar, late instar
5370010 gypsy moth Lymantria dispar caterpillar, late instar
1398123 cone resin midge Asynapta hopkinsi Midge larvae found inside a ddamaged red pine cone
5202099 poplar rust Melampsora medusae The causal agent of poplar leaf rust (also called conifer-aspen rust) fruiting on tamarack.
1398169 long-horned beetles Evidence of tunneling by Cerambycid larva under the bark of a recently killed white spruce
1398220 eastern pine gall rust Cronartium quercuum Globose gall typical of the pine-oak and pine-pine gall rusts on jack pine. Black River State Forest, Jackson Co., WI.
1398222 white pine weevil Pissodes strobi
1398260 birch leafminer Fenusa pusilla
1398262 birch leafminer Fenusa pusilla A heavily infested landscape tree
1398054 elm sawfly Cimbex americana
2121087 conifer sawfly Gilpinia frutetorum
2121091 snout beetles or weevils Acorn weevil larva that emerged from an infested northern pin oak acorn. The exit hole is visible as is internal damage to the acorn. The genus is either Curculio or Conotrachelus. Collected in Ramsey Co., MN, Sept. 2005
5202042 Diplodia tip blights Diplodia spp. diplodia in red pine understory
5202043 white pine weevil Pissodes strobi
5202044 quaking aspen Populus tremuloides Dense young aspen stand in northern Wisconsin
5202045 quaking aspen Populus tremuloides Group of mid-sized quaking aspen
5202046 quaking aspen Populus tremuloides Mature aspen stems, photo taken in northern Wisconsin
5202047 American beaver Castor canadensis cut stem, stump, and wood chips; Photo taken in Banning State Park, MN
5202048 American beaver Castor canadensis Partially chewed-through paper birch stem; Photo taken in Banning State park, MN
5202049 American beaver Castor canadensis Cut stem, stump and wood chips; Photo taken in Banning state Park, MN
5202051 American beaver Castor canadensis Paper birch cut down by beaver chewing; Photo taken in Banning State park, MN
5202052 red pine Pinus resinosa 35 year-old plantation in central Wisconsin; Plantation lacks understory; dense needle layer and heavy shade. Photo taken on the Black River State Forest, Wisconsin.
5202053 white pine weevil Pissodes strobi Terminal attack on a jack pine by the white pine weevil; Photo taken in Eau Claire County, Wisconsin
5202054 red pine Pinus resinosa Young 5-7 yr-old red pine; Photo taken in Eau Claire Co., WI
5202055 red pine Pinus resinosa Young 5-7 yr-old red pine in a plantation; Photo taken in Eau Claire Co., WI
5202057 oak wilt Ceratocystis fagacearum Active oak wilt pocket, early July, Eau Claire Co., WI
5202058 red pine shoot moth Dioryctria resinosella dead red pine shoot killed by a tunneling red pine shoot moth caterpillar.
5202059 red pine shoot moth Dioryctria resinosella Pitch tube
5202060 red pine shoot moth Dioryctria resinosella Dead shoots in mid-August; Photo taken in central Wisconsin, Jackson Co., WI
5202061 red pine shoot moth Dioryctria resinosella Dead shoot on red pine, mid-August, central WI; Photo taken in Jackson Co., WI
5202062 fall webworm Hyphantria cunea Tent on cherry in mid-September; Dunn Co., WI
5203002 mourning cloak butterfly Nymphalis antiopa Photo taken in Ramsey Co., MN, June 2006
5203003 woolly elm aphid Eriosoma americanum American elm leaf distorted by woolly elm aphid; Photo taken in Ramsey Co., MN, June 2006
5203004 woolly elm aphid Eriosoma americanum American elm leaf distorted by woolly elm aphid; photo taken in ramsey Co., MN, June 2006
5203005 woolly elm aphid Eriosoma americanum Elm leaf distorted by woolly elm aphids; Photo taken in Ramsey Co., MN, June 2006
5203006 mourning cloak butterfly Nymphalis antiopa photo taken in Ramsey Co., MN
5203007 mourning cloak butterfly Nymphalis antiopa Photo taken in Ramsey Co, MN, June 2006
5203008 weevil Polydrusus spp. photo taken in Ramsey Co., MN
5203009 weevil Polydrusus spp. Photo taken in Ramsey Co., MN.
5203010 weevil Polydrusus spp. Photo taken in Ramsey Co., MN
5203011 goldsmith beetle Cotalpa lanigera
5203012 goldsmith beetle Cotalpa lanigera Specimen from northeast Iowa
5203013 linden looper Erannis tiliaria
5203014 linden looper Erannis tiliaria
5203015 linden looper Erannis tiliaria
5202064 introduced pine sawfly Diprion similis
5202065 introduced pine sawfly Diprion similis
5202066 introduced pine sawfly Diprion similis
5202067 introduced pine sawfly Diprion similis
5202068 tar spot Rhytisma americanum Raised spots of leaf; Photo taken in August in Ramsey Co., MN
5202069 tar spot Rhytisma americanum Raised spots on leaf; Photo taken in August in Ramsey Co., MN
5202070 round-lobe hepatica Anemone americana Early spring woodland flower, photo taken in Dunn Co., WI
5202071 round-lobe hepatica Anemone americana Early spring woodland flower, photo taken in Dunn Co. WI
5202075 round-lobe hepatica Anemone americana photographed in early spring; Photo taken in Dunn Co., WI
5202076 yellow trout lily Erythronium americanum Flower and distinctive leaves
5202077 yellow trout lily Erythronium americanum Flowers and characteristic leaves of trout-lily; Photo taken in Clark Co., WI, in a northern hardwood forest.
5202079 white trillium Trillium grandiflorum Photo taken in a mesic, nutrient rich woodlot in Clark Co., WI
5202080 white trillium Trillium grandiflorum Spring woodland flower, photo taken in Clark Co., WI
5202081 yellow trout lily Erythronium americanum Flower and distinctive leaves; photo taken in Clark Co. WI
5202082 bloodroot Sanguinaria canadensis Flower, early May, Clark Co. WI in a nutrient rich woodlot
5202083 bloodroot Sanguinaria canadensis Group of bloodroot plants with flowers, early May, Clark Co. WI, nutrient rich, northern hardwood site; Trout lily leaves also visible
5202084 yellow trout lily Erythronium americanum Flower, partially open, northern hardwood site in Clark Co., WI. Early May
5202085 white trout lily Erythronium albidum Flowers and distinctive leaves, early May in a rich northern hardwood forest, Clark Co., WI
5202086 white trout lily Erythronium albidum Single flower and distinctive leaves, early May in a northern hardwood site in Clark Co., WI
5202087 yellow trout lily Erythronium americanum partially open flower, nutrient rich northern hardwood site, Clark Co., WI
5202088 European pine sawfly Neodiprion sertifer Photo taken in late May, Ramsey Co., MN
5202089 European pine sawfly Neodiprion sertifer photo taken in late May, Ramsey Co., WI
5202090 European pine sawfly Neodiprion sertifer Photo taken in May, Ramsey Co., MN
5202091 European pine sawfly Neodiprion sertifer Group of feeding larvae; Photo taken in Ramsey Co., MN
5202092 alternateleaf dogwood Cornus alternifolia flowering in a landscape setting
5202093 alternateleaf dogwood Cornus alternifolia Landscape specimen, flowers in late May in MN
5202094 linden looper Erannis tiliaria
5202095 linden looper Erannis tiliaria
5202096 linden looper Erannis tiliaria
5202097 ash flower gall mite Eriophyes fraxiniflora Distorted staminate flowers on ash, early season; Infested flowers turn dark brown to black and persist through the winter.
5202098 ash flower gall mite Eriophyes fraxiniflora
5203017 clinker polypore Inonotus obliquus Photo taken in Banning State Park, Pine Co., MN
5203018 yellow birch Betula alleghaniensis Photo taken in Banning State park, MN
5203019 elder borer Desmocerus palliatus Adult photographed in Pine Co., MN
5203020 meadowhawks Sympetrum spp. Photo taken at the University of Minnesota Landscape Arboretum
5203021 hophornbeam Ostrya virginiana Leaves and fruits (seed pods); Photo taken at the University of Minnesota Arboretum
5203022 hackberry nipplegall maker Pachypsylla celtidismamma Galls caused by the hackberry nipple gall maker on the underside of a hackberry leaf; Photo taken in Ramsey Co., MN
5203023 hackberry nipplegall maker Pachypsylla celtidismamma galls caused by the hackberry nipple gall maker on the underside of a hackberry leaf; Photo taken in Ramsey Co., MN
5203024 hackberry nipplegall maker Pachypsylla celtidismamma Single gall
1484007 fall webworm Hyphantria cunea webbing with defoliation; webbed foliage
1484010 pine webworm Pococera robustella
1484012 polyphemus moth Antheraea polyphemus
1484014 io moth Automeris io io
1484015 io moth Automeris io io
1484016 eastern tiger swallowtail Papilio glaucus
1484008 fall webworm Hyphantria cunea larvae enclosed in webbing on cherry
1484009 fall webworm Hyphantria cunea larvae enclosed in webbing on cherry
1484001 eastern tiger swallowtail Papilio glaucus
1484002 eastern tiger swallowtail Papilio glaucus
1484003 emerald ash borer Agrilus planipennis Photo taken in August 2002 in Livonia, MI.
1484004 emerald ash borer Agrilus planipennis infested tree showing water sprouts or adventitious shoots
1484005 yellow birch Betula alleghaniensis Mesic northern hardwood site in northern WI
1484017 yellow cap fungi Pholiota spp.
1484018 yellow cap fungi Pholiota spp.
1484019 yellow cap fungi Pholiota spp.
1484020 yellow cap fungi Pholiota spp.
1484013 blackheaded ash sawfly Tethida barda
1484022 red pine shoot moth Dioryctria resinosella pupae in shoot
1398022 multicolored Asian lady beetle Harmonia axyridis
1199020 cone beetles Conophthorus spp. Conoph
1199013 eastern pine seedworm Cydia toreuta Cydia torenta
1199014 eastern pine seedworm Cydia toreuta Cydia torenta, larva
1398175 sulfur shelf Laetiporus sulphureus
1398215 hemlock varnish shelf Ganoderma tsugae
1479028 gray tree frog Hyla versicolor Adult frog siiting on a fern. Photo taken in northern Minnesota
1479030 gray tree frog Hyla versicolor
1479031 bald eagle Haliaeetus leucocephalus perched atop a red pine
1479032 northern hardwoods fall color
1479033 black spruce Picea mariana black spruce bog; Spring 1989
1479034 fly agaric Amanita muscaria Photo taken in Waushara County, Wisconsin, red pine stand.
1479035 perennial lupine Lupinus perennis Wild lupine, flowering along a woodland road in central Wisconsin. This plant is the larval host for the federally endangered Karner blue butterfly. Photo taken in late May on the Jackson County Forest, Wisconsin.
1479036 northern hardwoods Yellow birch growing in northern Wisconsin
1479001 gypsy moth Lymantria dispar females laying eggs
1479003 Sirococcus blight of conifers Sirococcus conigenus
1479004 Sirococcus blight of conifers Sirococcus conigenus Needle droop, one of the symptoms that can indicate sirococcus blight on red pine. Photo taken on the Chequamegon National Forest in northern Wisconsin.
1479005 Allegheny mound ant Formica exsectoides mound in field
1479006 Allegheny mound ant Formica exsectoides mound in field
1479007 jack pine budworm Choristoneura pinus pinus Characteristic top-kill and mortality in jack pine following a jack pine budworm outbreak. Photo taken on the Chequamegon National Forest, northwest Wisconsin.
1479009 white heartwood rot Phellinus tremulae
1479012 tamarack Larix laricina fall color
1479024 Saratoga spittlebug Aphrophora saratogensis Branch mortality caused by adult Saratoga spittlebug feeding damage on young red pine. Similar damage can be caused by Sirococcus shoot blight. Photo taken on the Ottawa National Forest, Michigan.
1479025 red pine Pinus resinosa Dense plantation with no understory development. Photo taken on the Huron-Manistee National Forest, Michigan.
1479026 pileated woodpecker Dryocopus pileatus
1479014 northern hardwoods northern hardwoods; old-age sugar maple-beech-hemlock; Snag and large size downy woody debris
1479015 Armillaria root rots Armillaria spp. Dead young red pine killed by armillaria infection. Removing the bark at the base of the tree would reveal white mycelial mats.
1479016 northeastern sawyer Monochamus notatus
1479017 Scleroderris canker of pine and spruce Gremmeniella abietina Classic symptom of lower branch mortality due to the Lake States strain of scleroderris canker. Photo taken in a landscape depression on the Ottawa National Forest, Michigan. Lower branches were below snow line at this site.
1479018 yellowheaded spruce sawfly Pikonema alaskensis Characteristic feeding damage on a young open-grown white spruce. Photo taken near Park Rapids, Minnesota.
1479019 butternut Juglans cinerea
1479020 butternut Juglans cinerea
1479021 butternut Juglans cinerea
1479022 butternut Juglans cinerea
2121092 acorn and nut weevils Curculio spp. Acorn weevil larva that emerged from an infested northern pin oak acorn. The exit hole is visible as is internal damage to the acorn. The genus is either Curculio or Conotrachelus. Collected in Ramsey Co., MN, Sept. 2005
1479013 orangestriped oakworm Anisota senatoria
1479008 mechanical Damage from a camper at a campground
1479002 gypsy moth Lymantria dispar larvae emerging from egg mass
1199015 hail
1457004 pigeon tremex Tremex columba
1457005 eastern dwarf mistletoe Arceuthobium pusillum Witches' broom. Photo taken near Cloquet, MN
1457012 forest tent caterpillar Malacosoma disstria
1457019 white pine blister rust Cronartium ribicola Aecial spore stage of white pine blister rust on main stem of a small tree.
1457014 red pine Pinus resinosa Male flower at the time of pollen release.
1457016 emerald ash borer Agrilus planipennis Emerald ash borer infested ash trees along a street in Novi, MI. Photo taken in August 2002.
1457029 poplar-and-willow borer Cryptorhynchus lapathi
1457030 emerald ash borer Agrilus planipennis Bark removed by woodpeckers searching for emerald ash borer larvae and pupae in late winter, early spring. Photo taken in Ann Arbor, MI, 2004.
1457025 bronze birch borer Agrilus anxius External view of callus tissue formed over a larval gallery. Photo taken in Moundsview, MN, 2005
1457039 fire Prescribed fire in a white pine seed orchard. Oconto River Seed Orchard, Nicolet National Forest, Wisconsin.
1457033 forest tent caterpillar Malacosoma disstria
1457035 jack pine budworm Choristoneura pinus pinus Pupal case, found in silk webbing that ties the foliage and twigs together. Photo taken in northwestern, WI
1457043 red pine cone borer Eucosma monitorana Infested red pine cone that has been dissected. The cone is packed with frass.
2121083 May-June beetles Phyllophaga spp. Pine County, MN 2005.
2121100 May-June beetles Phyllophaga spp. Single white grub found in association with root damaged red pine seedlings in east central Minnesota. Seedlings had been planted into an old alfalfa field with lots of grass also present. Photo taken in Pine Co., MN
2121095 May-June beetles Phyllophaga spp. Larva found feeding on the fine roots of a red pine seedling. Photo taken in Pine Co., MN, September, 2005.
2121096 May-June beetles Phyllophaga spp. Single white grub found in association with root damaged red pine seedlings in east central Minnesota. Seedlings planted into an old alfalfa field with lots of grass present. Photo taken in Pine Co., MN.
2121097 May-June beetles Phyllophaga spp. White grubs found in association with root damaged red pine seedlings in east central Minnesota. The planting site was an old alfalfa field with lots of grass present. Photo taken in Pine Co., MN
1398239 forest tent caterpillar Malacosoma disstria Late instar larvae on the bark of a tree with virus killed caterpillars (hanging in an inverted V-position) present.
1398240 forest tent caterpillar Malacosoma disstria Two virus killed late-instar caterpillars (inverted V-shape)along with two healthy catrpillars.
1398241 forest tent caterpillar Malacosoma disstria Caterpillar in the center infected with Entomophaga, a fungal pathogen
1398196 northeastern sawyer Monochamus notatus On the bark of a basswood tree
1398197 white-lined sphinx Hyles lineata Single late-instar. Ramsey Co. MN
1398199 woodpeckers
1398187 carpenter ants Camponotus spp.
1398151 Pandora sphinx Eumorpha pandorus Single large caterpillar feeding on grape.
1398161 pigeon tremex Tremex columba
1398056 ocellate gall midge Acericecis ocellaris Eyespot galls.
1398060 post oak grasshopper Dendrotettix quercus
1398068 acorn-plum gall Amphibolips quercusjuglans Two plum galls formed on the outside of an acorn cup, photo taken in Sawyer Co., WI.
1398105 Asian longhorned beetle Anoplophora glabripennis tunneling under bark
1398135 eastern pine seedworm Cydia toreuta Pinned adult. Moth reared from red pine cone
1398125 webbing coneworm Dioryctria disclusa Pinned adult
1398144 red pine cone borer Eucosma monitorana
1398243 forest tent caterpillar Malacosoma disstria Pupal case wrapped in an understory fern leaf.
1398248 forest tent caterpillar Malacosoma disstria Two late instar caterpillars. Kennebac Co., MN 2001
1398097 oak tatters
1398106 Asian longhorned beetle Anoplophora glabripennis compared to Siricid wood wasp (bottom).
1398107 Asian longhorned beetle Anoplophora glabripennis
1398108 Asian longhorned beetle Anoplophora glabripennis
1398111 Asian longhorned beetle Anoplophora glabripennis in gallery
1398088 pale green weevil Polydrusus impressifrons mating
1398014 two-spotted lady beetle Adalia bipunctata Mating pair on balsam fir. Biological control, North American native, This pair was feeding on balsam twig aphid, Mindarus abietinus. Photo taken in Anoka County, MN
1398035 carpenter ants Camponotus spp. Holes from pileated woodpeckers preying on ants.
1398039 white-horned horntail Urocerus albicornis Photo taken in Mounds View MN June 2005
1388001 white pine blister rust Cronartium ribicola Pathological pruning. Northern Minnesota
1388019 Asian longhorned beetle Anoplophora glabripennis Assorted larval sizes of ALB removed from an infested hardwood stem found in the Chicago area, 1998.
1388016 stink bugs Biological control, stink bug nymph feeding on an ash sawfly larva
1388014 hemlock borer Phaenops fulvoguttata Late winter woodpecker activity probing for larvae. Woodpecker attacked trees have a characteristic red appearance as the outer bark is removed.
1199033 white pine weevil Pissodes strobi Board showing old weevil damage
1199026 forest tent caterpillar Malacosoma disstria Inverted V-shaped forest tent caterpillars infected with Polyhedrosis virus
1199027 forest tent caterpillar Malacosoma disstria Entomophaga (fungal) infection on the larger caterpillar in the center of the photograph.
1199028 forest tent caterpillar Malacosoma disstria Polyhedrosis virus infected forest tent caterpillar
1199005 large aspen tortrix Choristoneura conflictana Rolled leaf

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