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Steven Katovich's Images

Title: Forest Entomologist
Organization: USDA Forest Service
Unit: Forest Health Protection
Country: United States

Steve is a Forest Entomologist with the U.S. Forest Service who has worked most of his career in the Great Lakes Region.  His major work interest is in how forest management can influence insect populations.  Steve has a B.S. degree in forest management from the University of Wisconsin - Stevens Point, a M.S. degree in entomology from the University of Wyoming, and a Ph.D. in entomology from the University of Minensota.   
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Image Subject Name Scientific Name Description
1593087 eastern larch beetle Dendroctonus simplex Tamarack infested with eastern larch beetle, bark removal in late winter due to woodpecker probing. 
1593014 pruning (general)
5492769 barred owl Strix varia
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.  
5424277 spotted joe pye weed Eutrochium maculatum Flowering Joe-Pye-weed
1398069 acorn-plum gall Amphibolips quercusjuglans galls
1398218 eastern pine gall rust Cronartium quercuum Branch gall
1398272 forest tent caterpillar Malacosoma disstria Molted skins of early instar forest tent caterpillars
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.
1398253 poplar twiggall fly Hexomyza schineri Twig galls
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
1593092 net-winged beetles Calopteron spp. Adult beetle
5443536 human caused injury names carved in outer bark on paper birch  
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. 
1593000 wind Wind damage in an older red pine plantation, Chequamegon-Nicolet National Forest, WI. 
1593001 porcupine Erethizon dorsatum Porcupine damage to Lodgepole Pine
1593009 wind Wind Damage in an older highd ensity red pine plantation, Chequamegon-Nicolet Nation Forest.
1593027 hail Open wounds caused by an intense hail storm. 
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.   
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. 
1593083 native elm bark beetle Hylurgopinus rufipes
1593007 red pine Pinus resinosa Red pine (Pinus resinosa) regeneration under Diplodia infected overstory
1593074 white spruce Picea glauca Row thinning in white spruce
1593062 eastern white pine Pinus strobus
1593067 Saratoga spittlebug Aphrophora saratogensis Heavily damaged red pine growing in a dense stand of Sweetfern, the nymphal host of the Saratoga spittlebug
1593069 red pine Pinus resinosa Red pine plantation, photo illustrates row thinning. 
1593070 red pine Pinus resinosa Large mature red pine
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.  
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. 
1593030 eastern tent caterpillar Malacosoma americanum Tent formed by eastern tent caterpillar.
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. 
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. 
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
1593048 pine engraver Ips pini Nuptial chamber, egg eniches and egg gallery. 
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
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. 
5468219 green ash Fraxinus pennsylvanica Lower stem girdling caused by a rope.
5468220 green ash Fraxinus pennsylvanica Lower stem girdled by a rope.
5468216 ash borer Podosesia syringae
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
5468254 woodpeckers Woodpecker activity on an American basswood
5468255 woodpeckers Pileated woodpecker excavation
5468256 silver maple Acer saccharinum Mississippi River floodplain
5468262 silver maple Acer saccharinum Tree growing in the Mississippi River floodplain
5468264 silver maple Acer saccharinum Trees growing along a stream
5468268 silver maple Acer saccharinum Floodplain forest
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. 
5468217 ash borer Podosesia syringae
5468275 river birch Betula nigra
5468310 eastern arborvitae Thuja occidentalis
5468236 quaking aspen Populus tremuloides
5468324 smooth patch of oak Aleurodiscus oakesii
5468234 quaking aspen Populus tremuloides
5468235 quaking aspen Populus tremuloides
5468230 quaking aspen Populus tremuloides
5468228 quaking aspen Populus tremuloides
5468218 ash borer Podosesia syringae
5468245 garlic mustard Alliaria petiolata flowering plants
5468243 garlic mustard Alliaria petiolata bolting second year plant
5468276 yellow marsh marigold Caltha palustris group of flowering plants
5468318 red pine Pinus resinosa thinning planned, tree paint
5468321 red pine Pinus resinosa plantation
5468322 red pine Pinus resinosa
5468288 baldfaced hornet Dolichovespula maculata nest
5468280 spotted knapweed Centaurea stoebe single flower
5468247 garlic mustard Alliaria petiolata flowering plant in foreground, background has 1st-year plants
5468257 silver maple Acer saccharinum Large den tree
5468258 black willow Salix nigra Single tree with leaves
5468325 smooth patch of oak Aleurodiscus oakesii single tree
5468301 greater fringed gentian Gentianopsis crinita plant with multiple flowers
5468327 smooth patch of oak Aleurodiscus oakesii
5468316 closed bottle gentian Gentiana andrewsii
5468259 black willow Salix nigra single tree with leaves
5468305 mourning cloak butterfly Nymphalis antiopa
5468326 smooth patch of oak Aleurodiscus oakesii
5468300 greater fringed gentian Gentianopsis crinita
5468313 turk's-cap lily Lilium superbum
5468314 turk's-cap lily Lilium superbum
5468315 closed bottle gentian Gentiana andrewsii
5468224 quaking aspen Populus tremuloides
5468225 quaking aspen Populus tremuloides
5468231 quaking aspen Populus tremuloides
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.
5424273 common milkweed Asclepias syriaca Flowering common milkweed
5369999 great blue heron Ardea herodias Great blue heron and nest
5443527 eastern white pine Pinus strobus Fall needle color on white pine
5443518 red turpentine beetle Dendroctonus valens Pitch tube at tree base
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
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.
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
5443533 eastern white pine Pinus strobus Fall needle color change
5443539 Japanese beetle Popillia japonica Skeletonizing on Buckeye, August 2011
5443544 Japanese beetle Popillia japonica Defoliation on a buckeye. August 2011
5443545 Japanese beetle Popillia japonica Defoliation on a buckeye. 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
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. 
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.
1398189 frost and winter injury (general) Poor quality landscape tree with a frost crack.
1398168 mountain pine beetle Dendroctonus ponderosae Pitch tubes. Medicine Bow Mountains, southeast Wyoming
1398221 pine bark adelgid Pineus strobi White coated bark on a pole-sized white pine. Waushara County, WI
1398188 frost and winter injury (general) severe basal damage
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.
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.
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
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.
1398057 leafhopper Typhlocyba albicans Stippling damage on leaf in early summer. Hiawatha National Forest, MI
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.
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.
1398041 sugar maple borer Glycobius speciosus External damage on live standing tree
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
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
1398223 pine bark adelgid Pineus strobi White cottony masses on the bark
1398191 spruce needleminer Taniva albolineana
1199001 pine root collar weevil Hylobius radicis To base.
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
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
1398273 forest tent caterpillar Malacosoma disstria Late instar larvae massed on a young aspen tree. northwest Wisconsin, 2001.
1398194 spruce budworm Choristoneura fumiferana Dead and declining white spruce in northern MN following a spruce budworm outbreak
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
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.
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
1457009 eastern white pine Pinus strobus Large white pine, northern MN.
1457007 black ash decline Black ash decline symptoms, summer 2004, near Cloquest, MN
1388036 fir broom rust Melampsorella caryophyllacearum Cloquet Forestry Center, Univ. of MN
1398258 leafminer flies
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.
1457027 eastern tent caterpillar Malacosoma americanum Single tent with caterpillars. Photo taken in Jackson, Co., WI.
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
1388007 northern red oak Quercus rubra Menominee Indian Reservation, northern Wisconsin. Tree located in a shelterwood harvest unit.
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
1398228 white pine weevil Pissodes strobi Evidence of an old weevil attack on a 20-25 yr old white pine in Wisconsin.
1199019 white pine cone borer Eucosma tocullionana
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
1398193 spruce gall midge Mayetiola piceae
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
1398242 forest tent caterpillar Malacosoma disstria Multiple late instar larvae feeding on an ash leaf.
1388011 blue spruce Picea pungens Showing classic blue coloration. Inniswood Metro gardens in Westerville, Ohio.
1388024 balsam twig aphid Mindarus abietinus Twisted (distorted) new foliage
1398033 bronze birch borer Agrilus anxius
1398075 butternut woolyworm Eriocampa juglandis
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,
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
1398177 northern hardwoods Fall color in northern Wisconsin, paper birch, and red maple
5424274 common milkweed Asclepias syriaca Flowering common milkweed
5424275 common milkweed Asclepias syriaca flowering common milkweed
1398179 boreal owl Aegolius funereus
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.
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
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
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.
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.
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.
1398186 eastern arborvitae Thuja occidentalis
1398238 bronze poplar borer Agrilus liragus Winding gallery pattern showing on the outer bark
1398053 Dutch elm disease Ophiostoma ulmi Advanced crown symptoms.
1398250 Taphrina flower fungus Taphrina johansonii Infected catkins
1388033 leafhopper Typhlocyba albicans Michigan's Upper Peninsula
1388025 red pine shoot moth Dioryctria resinosella Pitch tube on a shoot infested with a single larva
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.
1388013 eastern arborvitae Thuja occidentalis growing along a trout stream in northern Wisconsin. Nicolet National Forest.
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.
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
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
1457003 forest tent caterpillar Malacosoma disstria NPV Virus killed
1199008 hail
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
5202073 scarlet elfcup Sarcoscypha austriaca Common name of scarlet cup, found in very early spring in a northern hardwood stand, Dunn Co., WI
5424276 redosier dogwood Cornus sericea
5424251 larch sawfly Pristiphora erichsonii Group of larvae
5424252 larch sawfly Pristiphora erichsonii single larva
5424253 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
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
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
5369971 bloodroot Sanguinaria canadensis
5369987 European pine sawfly Neodiprion sertifer clump of feeding larvae
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
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
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
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
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.
1398169 long-horned beetles Evidence of tunneling by Cerambycid larva under the bark of a recently killed white spruce
1398260 birch leafminer Fenusa pusilla
1398262 birch leafminer Fenusa pusilla A heavily infested landscape tree
5202071 round-lobe hepatica Anemone americana Early spring woodland flower, photo taken in Dunn Co. WI
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
5203021 hophornbeam Ostrya virginiana Leaves and fruits (seed pods); Photo taken at the University of Minnesota Arboretum
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
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
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
1484007 fall webworm Hyphantria cunea webbing with defoliation; webbed foliage
1484010 pine webworm Pococera robustella
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
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
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
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
1484008 fall webworm Hyphantria cunea larvae enclosed in webbing on cherry
1484009 fall webworm Hyphantria cunea larvae enclosed in webbing on cherry
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.
1398022 multicolored Asian lady beetle Harmonia axyridis
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
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.
1479018 yellowheaded spruce sawfly Pikonema alaskensis Characteristic feeding damage on a young open-grown white spruce. Photo taken near Park Rapids, Minnesota.
1479021 butternut Juglans cinerea
1479026 pileated woodpecker Dryocopus pileatus
1398175 sulfur shelf Laetiporus sulphureus
1398215 hemlock varnish shelf Ganoderma tsugae
1479001 gypsy moth Lymantria dispar females laying eggs
1479031 bald eagle Haliaeetus leucocephalus perched atop a red pine
1479032 northern hardwoods fall color
1479034 fly agaric Amanita muscaria Photo taken in Waushara County, Wisconsin, red pine stand.
1479036 northern hardwoods Yellow birch growing in northern Wisconsin
1479002 gypsy moth Lymantria dispar larvae emerging from egg mass
1479008 mechanical Damage from a camper at a campground
1199015 hail

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