| 5454365 |
Asian chestnut gall wasp |
Dryocosmus kuriphilus |
young gall of Dryocosmus kuriphilus |
| 5454366 |
Asian chestnut gall wasp |
Dryocosmus kuriphilus |
old galls of Dryocosmus kuriphilus |
| 5454367 |
Asian chestnut gall wasp |
Dryocosmus kuriphilus |
tree with old galls of Dryocosmus kuriphilus |
| 5472902 |
kermes scales |
Kermes spp. |
Female Lecanium scale opened to reveal many eggs. |
| 5472903 |
kermes scales |
Kermes spp. |
Female Lecanium scale (Lecanium sp.) opened to reveal many eggs. |
| 5472898 |
kermes scales |
Kermes spp. |
Close-up of female Lecanium scales on White oak. |
| 5472899 |
kermes scales |
Kermes spp. |
Close-up of female Lecanium scales on White oak. |
| 5472900 |
kermes scales |
Kermes spp. |
Close-up of 2 female Lecanium scales on White oak. |
| 5472901 |
kermes scales |
Kermes spp. |
Female Lecanium scale opened to reveal many eggs. |
| 5472895 |
kermes scales |
Kermes spp. |
Close-up of eggs of Lecanium scale on White oak. |
| 5472896 |
kermes scales |
Kermes spp. |
White oak with dieback of new terminal growth caused by a Lecanium scale. |
| 5472897 |
kermes scales |
Kermes spp. |
White oak with dieback of new terminal growth caused by a Lecanium scale. |
| 5476037 |
hickory bullet gall midge |
Caryomyia tubicola |
Leaves of a species of Hickory with bullet or tube galls caused by the midge, Caryomyia tubicola. |
| 5476038 |
hickory bullet gall midge |
Caryomyia tubicola |
Leaves of a species of Hickory with bullet or tube galls caused by the midge, Caryomyia tubicola. |
| 5476039 |
hickory bullet gall midge |
Caryomyia tubicola |
Two bullet or tube galls caused by the midge, Caryomyia tubicola protruding from the lower surface of a hickory leaf. One tube has been removed. |
| 5476040 |
hickory bullet gall midge |
Caryomyia tubicola |
View of the top surface of a hickory leaf where three bullet or tube galls caused by the midge, Caryomyia tubicola, are attached. |
| 5476041 |
hickory bullet gall midge |
Caryomyia tubicola |
Areas in the lower leaf surface after three bullet or tube galls caused by the midge, Caryomyia tubicola were removed from the lower surface of a hickory leaf. |
| 5476042 |
hickory bullet gall midge |
Caryomyia tubicola |
Two bullet or tube galls caused by the midge, Caryomyia tubicola, removed from the lower surface of a hickory leaf. |
| 5476044 |
hickory bullet gall midge |
Caryomyia tubicola |
One bullet or tube gall opened to reveal a larvae of the midge, Caryomyia tubicola. |
| 5476043 |
hickory bullet gall midge |
Caryomyia tubicola |
One bullet or tube gall opened to reveal a larvae of the midge, Caryomyia tubicola. |
| 5472894 |
Lecanium scales |
Lecanium spp. |
White oak with dieback of new terminal growth caused by a Lecanium scale. |
| 5388320 |
camellia |
Camellia japonica |
White scales cover this forest tree. |
| 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. |
| 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. |
| 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. |
| 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. |
| 5424434 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5424435 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5424436 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5424437 |
Marssonina leaf spots |
Marssonina spp. |
Spores of a species of the fungus Marssonina. |
| 5405252 |
anthracnose |
Aureobasidium apocryptum |
Upper surface of maple leaf with tan blotches having dark-green halos caused by the fungus Aureobasidium apocryptum. |
| 5405253 |
anthracnose |
Aureobasidium apocryptum |
Upper surface of maple leaf with tan blotches having dark-green halos caused by the fungus Aureobasidium apocryptum. |
| 5405254 |
anthracnose |
Aureobasidium apocryptum |
Close-up of upper surface of maple leaf with tan blotches having dark-green halos caused by the fungus Aureobasidium apocryptum. |
| 5405255 |
anthracnose |
Aureobasidium apocryptum |
Close-up of lower surface of maple leaf with tan blotches having dark-green halos caused by the fungus Aureobasidium apocryptum. |
| 5405256 |
anthracnose |
Aureobasidium apocryptum |
Close-up of lower surface of maple leaf showing one tan blotchy area having a dark-green halo caused by the fungus Aureobasidium apocryptum. |
| 5405257 |
anthracnose |
Aureobasidium apocryptum |
Close-up of lower surface of maple leaf showing tan infected tissue caused by the fungus Aureobasidium apocryptum. Note the lack of any signs of the pathogen. |
| 5405258 |
anthracnose |
Aureobasidium apocryptum |
Lower surface of maple leaf stained to reveal random acervuli of the fungus Aureobasidium apocryptum. |
| 5405259 |
anthracnose |
Aureobasidium apocryptum |
Lower surface of maple leaf stained to reveal a cluster of acervuli of the fungus Aureobasidium apocryptum. |
| 5405260 |
anthracnose |
Aureobasidium apocryptum |
An acervulus with stained conidia of the fungus Aureobasidium apocryptum. |
| 5405261 |
anthracnose |
Aureobasidium apocryptum |
An acervulus with stained conidia of the fungus Aureobasidium apocryptum. |
| 5405262 |
anthracnose |
Aureobasidium apocryptum |
Conidia of the fungus Aureobasidium apocryptum. |
| 5405285 |
anthracnose |
Discula spp. |
Upper surface of several leaves with large tan-brown blotchy areas starting between the major veins but eventually coalescing to blight large areas of the leaves believed to be caused by a species of Discula. |
| 5405286 |
anthracnose |
Discula spp. |
Upper surface of several leaves with large tan-brown blotchy areas starting between the major veins but eventually coalescing to blight large areas of the leaves believed to be caused by a species of Discula. |
| 5405287 |
anthracnose |
Discula spp. |
Upper surface of a single leaf with large tan-brown blotchy areas starting between the major veins but eventually coalescing to blight large areas of the leaves believed to be caused by a species of Discula. |
| 5405288 |
anthracnose |
Discula spp. |
Close-up of the upper surface of a leaf with large tan-brown blotchy area believed to be caused by a species of Discula. |
| 5405289 |
anthracnose |
Discula spp. |
Close-up of the upper surface of a leaf with large tan-brown blotchy area believed to be caused by a species of Discula. |
| 5405290 |
anthracnose |
Discula spp. |
Close-up of the lower surface of a blighted area of a leaf believed to be caused by a species of Discula. |
| 5405291 |
anthracnose |
Discula spp. |
Close-up of the lower surface of a blighted area of a leaf showing black dots ("acervuli") along the major veins believed to be of a species of Discula. |
| 5405292 |
anthracnose |
Discula spp. |
Close-up of the lower surface of a blighted area of a leaf showing black dots ("acervuli") along the major veins believed to be of a species of Discula. |
| 5405293 |
anthracnose |
Discula spp. |
Close-up of the lower surface of a blighted area of a leaf showing black dots ("acervuli") along the major veins believed to be of a species of Discula. |
| 5405294 |
anthracnose |
Discula spp. |
Lower surface of a blighted area of a leaf stained to show mycelium and acervuli along the major veins believed to be of a species of Discula. |
| 5405295 |
anthracnose |
Discula spp. |
Lower surface of a blighted area of a leaf stained to show mycelium and acervuli along the major veins believed to be of a species of Discula. |
| 5405296 |
anthracnose |
Discula spp. |
Close-up of a blighted area of a leaf stained to show an acervulus along a major vein believed to be of a species of Discula. |
| 5405297 |
anthracnose |
Discula spp. |
A single stained acervulus and several conidia believed to be of a species of Discula. |
| 5405298 |
anthracnose |
Discula spp. |
A single stained acervulus and several conidia believed to be of a species of Discula. |
| 5405299 |
downy mildew |
Plasmopara cercidis |
Angular tan to brown blocks of infected tissue mostly along the veins on the upper leaf surface caused by the fungus Plasmopara cercidis. The eight or more larger brown spots that are less angular and surrounded by a yellow halo are infections of Pseudocercospora vitis the cause of Pseudocercospora leaf blight.
|
| 5405300 |
downy mildew |
Plasmopara cercidis |
Angular white to brown blocks of infected tissue mostly along the veins on the lower leaf surface caused by the fungus Plasmopara cercidis. The eight or more larger brown spots that are less angular and surrounded by a yellow halo are infections of Pseudocercospora vitis the cause of Pseudocercospora leaf blight. |
| 5405301 |
downy mildew |
Plasmopara cercidis |
Close-up of the lower surface of a leaf with angular areas of older and younger infections caused by the fungus Plasmopara cercidis. White sporangiaphores and sporangia can be seen coming from the younger infected tissue. |
| 5405302 |
downy mildew |
Plasmopara cercidis |
Close-up of the lower surface of a leaf with angular areas of younger infections caused by the fungus Plasmopara cercidis. White sporangiaphores and sporangia can be seen coming from the younger infected tissue. |
| 5405303 |
downy mildew |
Plasmopara cercidis |
Close-up of one angular area of younger infection caused by the fungus Plasmopara cercidis. White sporangiaphores and sporangia can be seen coming from the infected tissue. |
| 5405304 |
downy mildew |
Plasmopara cercidis |
Characteristic sporangiaphores and sporangia of the fungus Plasmopara cercidis. |
| 5405305 |
downy mildew |
Plasmopara cercidis |
Characteristic sporangiaphores and sporangia of the fungus Plasmopara cercidis. |
| 5405340 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Several leaves with large, brown blotches with yellow halos on the upper leaf surface caused by the fungus Pseudocercospora vitis. Also on the leaves are angular tan to brown blocks of infected tissue mostly along the veins caused by the fungus Plasmopara cercidis. |
| 5405341 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Several leaves with large, brown blotches with yellow halos on the lower leaf surface caused by the fungus Pseudocercospora vitis. Also on the leaves are angular tan to brown blocks of infected tissue mostly along the veins caused by the fungus Plasmopara cercidis. |
| 5405342 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
A single leaf with large, brown blotches with yellow halos on the upper leaf surface caused by the fungus Pseudocercospora vitis. Also on the leaves are angular tan to brown blocks of infected tissue mostly along the veins caused by the fungus Plasmopara cercidis. |
| 5405343 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
A single leaf with large, brown blotches with yellow halos on the lower leaf surface caused by the fungus Pseudocercospora vitis. Also on the leaves are white to gray-brown blocks of infected tissue mostly along the veins caused by the fungus Plasmopara |
| 5405344 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Close-up of a large, brown blotch on the upper leaf surface caused by the fungus Pseudocercospora vitis. |
| 5405345 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Light shown at a steep angle to the upper leaf surface surface illuminating random tufts which are "synnemata", the spore-producing bodies of the fungus Pseudocercospora vitis. |
| 5405346 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
View across single spot with dark green-black "synnemata" of Pseudocercospora vitis, which are clusters of conidiophores and conidia, coming up from infected tissue. |
| 5405347 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Close-up view across single spot with dark green-black "synnemata" of Pseudocercospora vitis, which are clusters of conidiophores and conidia, coming up from infected tissue. |
| 5405348 |
Pseudocercospora leaf spot |
Pseudocercospora vitis |
Close-up of single dark green-black "synnema" of Pseudocercospora vitis, which are clusters of conidiophores and conidia, coming up from infected tissue. |
| 5405359 |
leaf spot |
Tubakia dryina |
Pycnothyria and conidia of Tubakia dryina. |
| 5405360 |
leaf spot |
Tubakia dryina |
Pycnothyrium and conidia of Tubakia dryina. |
| 5405361 |
leaf spot |
Tubakia dryina |
Pycnothyrium and conidia of Tubakia dryina. |
| 5405362 |
leaf spot |
Tubakia dryina |
Conidia of Tubakia dryina. |
| 5405363 |
leaf spot |
Tubakia dryina |
Upper surface of red oak leaves with spots infected with the fungus Tubakia dryina. |
| 5405364 |
leaf spot |
Tubakia dryina |
Lower surface of red oak leaves with spots infected with the fungus Tubakia dryina. |
| 5405365 |
leaf spot |
Tubakia dryina |
Close up of upper surface of red oak leaves with spots infected with the fungus Tubakia dryina. |
| 5368464 |
Cryptocline fungus |
Cryptocline betularum |
Conidia of the fungus Cryptocline betularum. |
| 5368447 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of two spots on underside of the leaf where spore-producing bodies ("pycnidia") are not distinguishable. |
| 5385787 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5385788 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5385789 |
Marssonina leaf spots |
Marssonina spp. |
Close-up of one spot on lower surface of leaf with a single spore-producing body ("acervulus"). |
| 5385790 |
Marssonina leaf spots |
Marssonina spp. |
Spores of a species of the fungus Marssonina. |
| 5368683 |
Verticillium wilts |
Verticillium spp. |
Culture of a species of the fungus Verticillium taken from discolored xylem tissue on Acid potato dextrose agar (APDA). Isolated from red maple (Acer rubrum). |
| 5368586 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368587 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368588 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368589 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368649 |
leaf spot |
Tubakia dryina |
One spore-producing body ("acervulus"). |
| 5368648 |
leaf spot |
Tubakia dryina |
Close-up of one spot on upperside of leaf with raised, dark, spore-producing bodies ("acervuli"). |
| 5368650 |
leaf spot |
Tubakia dryina |
|
| 5368427 |
powdery mildew |
Phyllactinia spp. |
Negative image of the sexual reproductive body of the fungus (“cleistothecium”) with characteristic bulbous base of appendages. |
| 5368428 |
powdery mildew |
Phyllactinia spp. |
Sexual reproductive body of the fungus (“cleistothecium”) with characteristic bulbous base of appendages. |
| 5368429 |
powdery mildew |
Phyllactinia spp. |
Underside of infected leaves showing white fungal mycelium and many, black, sexual reproductive bodies of the fungus (“cleistothecia”). |
| 5368430 |
powdery mildew |
Phyllactinia spp. |
Close-up of the underside of infected leaf showing white fungal mycelium and many, black, sexual reproductive bodies of the fungus (“cleistothecia”). |
| 5368445 |
Marssonina leaf spots |
Marssonina spp. |
Upper surface of leaf with gray/white spots and thin brown borders. |
| 5368446 |
Marssonina leaf spots |
Marssonina spp. |
Lower surface of leaf shows leaf spots are darker brown than upper surface appearance. |
| 5368461 |
Cryptocline fungus |
Cryptocline betularum |
Leaves with spots starting out tan and turning gray then white. |
| 5368462 |
Cryptocline fungus |
Cryptocline betularum |
Close-up of leaf spots where in some spots the missing tissue in the center was where the spore-producing body of the fungus was located. |
| 5368463 |
Cryptocline fungus |
Cryptocline betularum |
Close-up of one spore-producing body ("acervulus") is seen in dark-field observation. |
| 5368647 |
leaf spot |
Tubakia dryina |
Tan/brown spots with broad, darker brown border. |
| 5368678 |
Verticillium wilts |
Verticillium spp. |
Shortly after transplanting, potted trees showed poor growth. |
| 5368679 |
Verticillium wilts |
Verticillium spp. |
Top dieback at junction between tissue infected by a secondary fungus and healthy tissue. |
| 5368680 |
Verticillium wilts |
Verticillium spp. |
Bark stripped off top portion of trunk and branches to show dead vascular tissue. |
| 5368681 |
Verticillium wilts |
Verticillium spp. |
Lower portion of trunk with outer tissue stripped off to reveal discolored xylem tissue. |
| 5368682 |
Verticillium wilts |
Verticillium spp. |
Trunk portion near ground level with outer tissue cut away to reveal discolored xylem tissue. |
| 5368684 |
Verticillium wilts |
Verticillium spp. |
Cross and tangential sections of the lower trunk of one of the nursery trees showing characteristic olive green color of Verticillium-infected xylem. |
| 5368685 |
Verticillium wilts |
Verticillium spp. |
Trunk section with outer tissue cut away to reveal characteristic olive green color of Verticillium-infected xylem. |
| 5368707 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores with clusters of colorless conidia at the top. |
| 5368708 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores with clusters of colorless conidia at the top. |
| 5368709 |
Dutch elm disease |
Ophiostoma ulmi |
Incubation of symptomatic pieces of elm branches, surface sterilized and placed in an incubation chamber. |
| 5368710 |
Dutch elm disease |
Ophiostoma ulmi |
Tree limbs and leaves shown symptoms of dieback. |
| 5368713 |
downy spot |
Microstroma juglandis |
Upper surface of infected leaves with light green colored bumps. |
| 5368714 |
downy spot |
Microstroma juglandis |
Lower surface of infected leaves showing white mold directly opposite the bumps on upper surface. |
| 5368715 |
downy spot |
Microstroma juglandis |
Close-up of white spore-producing bodies ("conidiophores") and spores. |
| 5368716 |
downy spot |
Microstroma juglandis |
Close-up of light green colored bumps on upper surface of leaf. |
| 5368742 |
vein pocket gall |
Macrodiplosis erubescens |
Branch with severely symptomatic leaves. |
| 5368743 |
vein pocket gall |
Macrodiplosis erubescens |
Close-up of galling along the midrib and major veins. |
| 5368744 |
vein pocket gall |
Macrodiplosis erubescens |
View of upper leaf surface symptoms. |
| 5368745 |
vein pocket gall |
Macrodiplosis erubescens |
View of lower leaf surface symptoms. |
| 5368937 |
black spot of elm |
Stegophora ulmea |
Leaves with small, raised black spots with a fine area of white tissue surrounding them, found mostly between the major veins. |
| 5368938 |
black spot of elm |
Stegophora ulmea |
Close-up of infected spots with blister-like, brown spore-producing bodies ("acervuli") within the spots. |
| 5368939 |
black spot of elm |
Stegophora ulmea |
Close-up of infected spots with blister-like, brown spore-producing bodies ("acervuli") within the spots. |
| 5368940 |
black spot of elm |
Stegophora ulmea |
Close-up of one infected spot with blister-like, brown spore-producing bodies ("acervuli") seen under dark-field observation. |
| 5369056 |
Septoria leaf spot and cankers |
Septoria spp. |
Dark brown, angular spots with gray flecks. |
| 5369057 |
Septoria leaf spot and cankers |
Septoria spp. |
Close-up of the underside of the leaf showing dark brown, angular spots with gray flecks. |
| 5369058 |
Septoria leaf spot and cankers |
Septoria spp. |
One infected area of leaf where dark brown, spore-producing bodies ("pycnidia") can be seen within the spots. |
| 5369059 |
Septoria leaf spot and cankers |
Septoria spp. |
Close-up of infected area with dark brown, spore-producing bodies ("pycnidia"). |
| 5369060 |
Septoria leaf spot and cankers |
Septoria spp. |
Dark-field observation of long, thin spores of a species of the fungus Septoria. |
| 5369061 |
Septoria leaf spot and cankers |
Septoria spp. |
Long, thin spores of a species of the fungus Septoria. |
