| 5427715 |
bacterial leaf spot |
Pseudomonas cichorii |
Symptoms of bacterial leaf spot on mum plants |
| 5427744 |
slime mold |
Stemonitis spp. |
Slime mold fruiting on chrysanthemum leaves |
| 5407846 |
leaf spot |
Ceratobasidium stevensii |
Rhizomorphs and sclerotia of Corticium stevensii on apple fruit |
| 5407847 |
leaf spot |
Ceratobasidium stevensii |
Mid-branch blighting of apples leaves due to thread blight |
| 5407848 |
leaf spot |
Ceratobasidium stevensii |
Blighting of leaves on several apple branches due to Corticium stevensii (thread blight) |
| 5407849 |
leaf spot |
Ceratobasidium stevensii |
Close-up of rhizomorphs and sclerotia of Corticium stevensii on apple branch |
| 5427716 |
Marssonina leaf spots |
Marssonina spp. |
Marssonina leaf spot symptoms on bittersweet leaf |
| 5407845 |
sooty blotch |
Gloeodes pomigena |
Sooty blotch (Gloeodes promigena) and flyspeck (Schizothirium pomi) on unsprayed fruit |
| 5427709 |
Alternaria blight |
Alternaria zinniae |
Small reddish brown spots with grayish centers typical of Alternaria leaf blight on zinnia |
| 5427711 |
bitter rot and anthracnose |
Colletotrichum gloeosporioides |
Close-up of a large anthracnose lesion on a dumbcane (Dieffenbachia) leaf |
| 5430469 |
Pseudomonas bacterium |
Pseudomonas savastanoi |
Olive knot cankers on a European ash branch. |
| 5430471 |
ash anthracnose |
Gnomoniella fraxini |
Close-up of ash foliage showing necrosis due to anthracnose. |
| 5430477 |
Phytophthora root rot |
Phytophthora cactorum |
Close-up of bleeding canker on a beech trunk. |
| 5424386 |
leaf and flower gall |
Exobasidium vaccinii |
Leaf or flower parts become infected and galls form. |
| 5424387 |
leaf and flower gall |
Exobasidium vaccinii |
Leaf or flower parts become infected and galls form. |
| 5424388 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of boxelder with marginal leaf scorch caused by the bacterium, Xylella fastidiosa. |
| 5424394 |
Dutch elm disease |
Ophiostoma ulmi |
Single, infected tree showing "flagging" symptom of individual branches dying back. |
| 5424396 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of common mulberry showing marginal leaf scorch with yellow border caused by the bacterium, Xylella fastidiosa. |
| 5424397 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of common mulberry showing marginal leaf scorch with dark brown and yellow banded border between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424398 |
bacterial leaf scorch |
Xylella fastidiosa |
Single leaf of common mulberry showing marginal leaf scorch with dark brown and yellow banded border between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424399 |
snow and ice damage (snow load) |
|
Dogwood buds encapsulated in ice in 2003. |
| 5424400 |
snow and ice damage (snow load) |
|
Dogwood buds encapsulated in ice in 2003. |
| 5430479 |
dogwood anthracnose |
Discula destructiva |
Foliar symptoms of dogwood anthracnose. |
| 5430482 |
powdery mildew |
Erysiphe pulchra |
Powdery mildew fungal growth on the foliage of dogwood leaves and shoot. |
| 5430486 |
American hawthorn rust |
Gymnosporangium globosum |
Yellow spotting on the upper side of hawthorn leaves infected by the cedar-hawthorn rust fungus, Gymnosporangium globosum. |
| 5427720 |
leaf spot |
Ceratobasidium stevensii |
Rhizomorphs and sclerotia of the thread blight organism on a cotoneaster branch. |
| 5424401 |
snow and ice damage (snow load) |
|
Dogwood trees bent over due to accumulated ice in 2003. |
| 5424402 |
snow and ice damage (snow load) |
|
Holly leaves coated with ice in 2003. |
| 5424403 |
snow and ice damage (snow load) |
|
A large bur oak toppled due to weight of ice in 2003. |
| 5424404 |
snow and ice damage (snow load) |
|
A line of willow oaks coated with ice in 2003. |
| 5424405 |
snow and ice damage (snow load) |
|
A line of willow oaks coated with ice showing extensive limb breakage in 2003. |
| 5424406 |
snow and ice damage (snow load) |
|
A large silver maple toppled onto a house for sale in 2003. |
| 5424407 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of red maple showing marginal leaf scorch with diffuse yellow border between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424408 |
bacterial leaf scorch |
Xylella fastidiosa |
Single leaf of red maple showing marginal leaf scorch with diffuse yellow border between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424409 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of red maple showing marginal leaf scorch with distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424411 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaf of a maple species showing marginal leaf scorch with broad, distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424412 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of common mulberry with early symptoms of bacterial leaf scorch caused by the bacterium, Xylella fastidiosa. |
| 5424413 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaf of bur oak showing non-continuous band of colors caused by the bacterium, Xylella fastidiosa. |
| 5424414 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of English oak show distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424415 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaf of pin oak showing distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424416 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaf of pin oak showing mostly scorched tissue but for a small area near the base where there are distinct bands of discolored tissue caused by the bacterium, Xylella fastidiosa. |
| 5424417 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of pin oak showing varying degrees of scorched and banded tissue caused by the bacterium, Xylella fastidiosa. |
| 5424418 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of pin oak showing varying degrees of scorched and bands of colors caused by the bacterium, Xylella fastidiosa. |
| 5424419 |
bacterial leaf scorch |
Xylella fastidiosa |
Entire tree showing leaf scorch symptoms due to the bacterium, Xylella fastidiosa. |
| 5424420 |
bacterial leaf scorch |
Xylella fastidiosa |
Tree showing dieback due to the bacterium, Xylella fastidiosa. |
| 5424421 |
bacterial leaf scorch |
Xylella fastidiosa |
Red oak tree showing scorching of leaves on random branches caused by the bacterium, Xylella fastidiosa. |
| 5430490 |
Nectria canker |
Nectria spp. |
Nectria canker fungal fruiting bodies on silver maple |
| 5430495 |
Verticillium wilt |
Verticillium dahliae |
Vascular streaking in a maple branch infected with Verticillium dahliae. |
| 5430498 |
quince rust |
Gymnosporangium clavipes |
Telial stage of cedar-quince rust on eastern redcedar. |
| 5427735 |
Pyracantha scab |
Spilocaea pyracanthae |
Symptoms and signs of scab on pyracantha fruit
|
| 5427738 |
black spot |
Diplocarpon rosae |
Circular black spots with feathery margins and yellowing typical of black spot of rose |
| 5427741 |
rose rosette disease |
Uncharacterised agent RRD |
Symptoms in this image are suspected to be caused by a virus.
Excessive thorn formation symptoms associated with rose rosette. The disease is believed to be due to a mite-transmitted virus. |
| 5424444 |
black spot |
Diplocarpon rosae |
Leaves with feathery black spots of similar size with surrounding tissue turning yellow/brown. |
| 5424445 |
black spot |
Diplocarpon rosae |
Leaves with feathery black spots of varying size, some with surrounding tissue turning yellow others not. |
| 5424422 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of red oak showing scorching and bands of colors caused by the bacterium, Xylella fastidiosa. |
| 5424423 |
bacterial leaf scorch |
Xylella fastidiosa |
2 leaves of scarlet oak with distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424424 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaf of scarlet oak with some banding of colors between scorched and symptomless tissue but barely any yellow band. |
| 5424425 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of shingle oak with distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424452 |
bacterial leaf scorch |
Xylella fastidiosa |
Single leaf of sweetgum showing distinct bands of discoloration between scorched and symptomless tissue caused by the bacterium, Xylella fastidiosa. |
| 5424453 |
bacterial leaf scorch |
Xylella fastidiosa |
Leaves of sycamore with scorch symptoms caused by the bacterium, Xylella fastidiosa. banding of color is not nearly as distinct as with other tree types. |
| 5427743 |
scab of poinsettia |
Sphaceloma poinsettiae |
Poinsettia stem with scab lesions |
| 5407866 |
bitter rot and anthracnose |
Colletotrichum gloeosporioides |
Brown, circular, sunken lesion on peach fruit due to the anthracnose fungus |
| 5424433 |
bacterial leaf scorch |
Xylella fastidiosa |
Large oak tree with decline symptoms in the form of branch dieback and browned leaves. |
| 5407853 |
orange rust |
Gymnoconia nitens |
Blackberry shoots infected with orange rust (right) compared to healthy shoots (left). |
| 5407854 |
iron deficiency |
|
Close-up of interveinal chlorosis due to iron deficiency |
| 5407856 |
2,4-D |
|
Foliar distortion due to growth regulator herbide injury |
| 5407858 |
gray mold |
Botrytis cinerea |
Bunch rot; Berries in grape cluster covered with Botrytis cinerea |
| 5407859 |
crown gall |
Rhizobium vitis |
Crown gall on grape vine |
| 5407861 |
downy mildew |
Plasmopara viticola |
Downy fungal growth on the underside of grape leaves infected with Plasmopara viticoloa |
| 5407870 |
fire blight |
Erwinia amylovora |
Bacteria (Erwinia amylovora) oozing from infected pear leaf |
| 5407871 |
gummosis |
|
Gummy exuduate (gummosis) of unknown cause on plum |
| 5407873 |
anthracnose |
Elsinoe veneta |
Small roundish anthracnose lesions on young raspberry cane |
| 5407875 |
yellow rust |
Phragmidium rubi-idaei |
Pustules of yellow rust (Phragmidium rubi-idaei) on the upperside of raspberry leaves |
| 5407876 |
anthracnose |
Colletotrichum acutatum |
Ripening strawberry fruit showing the firm, sunken lesions typical of anthracnose fruit rot disease caused by Colletotrichum acutatum |
| 5407877 |
red stele |
Phytophthora fragariae |
Strawberry roots showing the reddish brown stele associated with Phytophthora fragariae (red stele disease) |
| 5407833 |
blister spot |
Pseudomonas syringae pv. papulans |
cv Mutsu
Mutsu apple fruit with the small, irregular brown spots typical of blister spot |
| 5407834 |
blister spot |
Pseudomonas syringae pv. papulans |
Close-up of Mutsu apple fruit with the small, irregular brown spots typical of blister spot
cv Mutsu |
| 5407836 |
cedar-apple rust |
Gymnosporangium juniperi-virginianae |
Cedar gall with emerging telial horns |
| 5407839 |
fire blight |
Erwinia amylovora |
Flower spur blighted by Erwinia amylovora (fire blight) |
| 5407840 |
fire blight |
Erwinia amylovora |
Widespread fire blight dieback symptoms throughout an apple orchard |
| 5407852 |
Xylaria root rots |
Xylaria spp. |
Fruiting bodies of Xylaria sp. at the base of a tree |
| 5407863 |
bacterial leaf scorch |
Xylella fastidiosa |
Brown, irregular "islands" of necrosis on young grape vines infected with Xylella fastidiosa (Pierce's disease) |
