| 1574390 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
After washing, sclerotia of black scurf remain. February 1998 |
| 1574387 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
After washing, sclerotia of black scurf remain. February 1998 |
| 1574388 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
After washing, sclerotia of black scurf remain. February 1998 |
| 1574389 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
After washing, sclerotia of black scurf remain. February 1998 |
| 1574385 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Dark sclerotia and hyphae of Rhizoctonia cause soil to adhere more tightly to tubers. February 1998 |
| 1574386 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
After washing, sclerotia of black scurf remain. February 1998 |
| 1574355 |
sour rot |
Geotrichum candidum |
Cortical collapse symptoms associated with Geotrichum candidum and sour rot. February 1998 |
| 1574350 |
bacterial soft rot |
Pectobacterium carotovorum ssp. carotovorum |
Bacterial soft rot of cauliflower curd. February 1998 |
| 1573313 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Gummy stem blight typically starts at leaf margins. Note the small black dots (pycnidia of the pathogen) in the tan lesion. June 1997 |
| 5492332 |
Ploioderma fungi |
Ploioderma spp. |
Immature Ploioderma fruiting bodies appearing as thin black lines on the needle surface; as fruiting bodies mature and swell, the needle epidermis will split along these lines. |
| 5492324 |
oak wilt |
Ceratocystis fagacearum |
Dark streaking on wood of oak branch |
| 5492327 |
Phytophthora blight |
Phytophthora capsici |
Phytophthora capsici infection of ripe zucchini fruit |
| 5492318 |
early blight |
Alternaria solani |
External and internal view of Early Blight lesions; note symptoms within this tuber are shallow. |
| 5492319 |
early blight |
Alternaria solani |
Large lesion on tuber infected with Early Blight pathogen Alternaria solani |
| 5492320 |
early blight |
Alternaria solani |
Shallow symptoms in potato tuber flesh where skin cut away from lesion of tuber infected with Alternaria solani |
| 5492304 |
mycelial neck rot |
Botrytis tulipae |
Rough yellow lesions on surface of an infected bulb |
| 5492341 |
white rot |
Stromatinia cepivora |
small dark sclerotia on garlic |
| 5484088 |
Boxwood blight |
Calonectria pseudonaviculata |
Twigs with view of leaf spots. |
| 5484089 |
Boxwood blight |
Calonectria pseudonaviculata |
Small twigs with view of leaf spots from underside of leaves. |
| 5484090 |
late blight |
Phytophthora infestans |
Late blight symptom, leaf spot, view of upper and lower leaf surfaces. |
| 5484091 |
late blight |
Phytophthora infestans |
late blight symptom on green fruit surface |
| 5484092 |
late blight |
Phytophthora infestans |
Late blight internal symptom in green fruit |
| 5486242 |
cedar-apple rust |
Gymnosporangium juniperi-virginianae |
Cedar apple rust disease on apple tree at Cox Arboretum in Dayton OH |
| 5486243 |
apple scab |
Venturia inaequalis |
Apple scab on crabapple |
| 5485610 |
bread mold |
Rhizopus stolonifer |
Sporangiophores with sporangia growing from clove. |
| 5492321 |
late blight |
Phytophthora infestans |
Cut surface exposing internal symptoms of tuber infected with Phytophthora infestans |
| 5485244 |
Phomopsis blight |
Phomopsis juniperivora |
Infected branch tips. |
| 5486077 |
Entomosporium leaf spot |
Diplocarpon mespili |
Infected leaf |
| 5486078 |
Entomosporium leaf spot |
Diplocarpon mespili |
Infected leaf |
| 5487428 |
Ascochyta fungi |
Ascochyta spp. |
Infected leaves and pods |
| 5490429 |
anthracnose |
Colletotrichum spp. |
Acervuli evident on infected pod |
| 5488153 |
Cercospora fungi |
Cercospora spp. |
Symptomatic leaves |
| 5488384 |
Alternaria fungus |
Alternaria papaveris |
Symtomatic infected plant |
| 5488240 |
Ploioderma fungi |
Ploioderma spp. |
Symptomatic infected foliage |
| 5490476 |
white pine blister rust |
Cronartium ribicola |
Infected leaf top side. Odd line pattern may have other abiotic cause. |
| 5490475 |
white pine blister rust |
Cronartium ribicola |
Symptomatic infected leaf underside |
| 5490478 |
black spot |
Diplocarpon rosae |
Symptomatic infected leaf |
| 5490440 |
Cercospora fungus |
Cercospora ligustrina |
Leaf spot upper surface |
| 5490436 |
Cercospora fungus |
Cercospora ligustrina |
Symptomatic infected foliage |
| 5490435 |
Cercospora fungus |
Cercospora ligustrina |
Symptomatic infected leaves |
| 1574191 |
scurf |
Monilochaetes infuscans |
In addition to the more obvious soil stain symptom, scurf will often cause minute cracking of the root surface. November 1997 |
| 1574192 |
scurf |
Monilochaetes infuscans |
In addition to the more obvious soil stain symptom, scurf will often cause minute cracking of the root surface. November 1997 |
| 1574193 |
scurf |
Monilochaetes infuscans |
In addition to the more obvious soil stain symptom, scurf will often cause minute cracking of the root surface. November 1997 |
| 1574189 |
scurf |
Monilochaetes infuscans |
In addition to the more obvious soil stain symptom, scurf will often cause minute cracking of the root surface. In this case, almost the entire surface of the root is covered by the symptom. November 1997 |
| 1574187 |
scurf |
Monilochaetes infuscans |
Scurf will often cause minute cracking of the root surface. November 1997 |
| 1574188 |
scurf |
Monilochaetes infuscans |
In addition to the more obvious soil stain symptom, scurf will often cause minute cracking of the root surface. November 1997 |
| 1574185 |
Rhizopus soft rots |
Rhizopus spp. |
Tufts of sporulation emerge from areas where skin is broken. The entire root is soft rotted. November 1997 |
| 1574184 |
fasciation |
|
Fasiated stems. November 1997 |
| 1574180 |
sour rot |
Geotrichum candidum |
Geotrichum sour rot. White cheesy growth is mycelium and conidia of the pathogen. November 1997
|
| 1574179 |
sour rot |
Geotrichum candidum |
Geotrichum sour rot. White cheesy growth is mycelium and conidia of the pathogen. November 1997
|
| 1574177 |
mosaic viruses (general) |
|
Zucchini Yellow Mosaic Virus and Watermelon Mosaic Virus on slicing cucumber. November 1997
|
| 1574161 |
boron deficiency |
|
Splitting of stem tissue. |
| 1574152 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Gummy stem blight caused the large lesion in the center. Other smaller lesions were caused by target spot. |
| 1574151 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Gummy stem blight caused the large lesion in the center. Other smaller lesions were caused by target spot. |
| 1574150 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Fruiting bodies (pycnidia) of the pathogen are evident in the lesion as tiny black dots. |
| 1574149 |
gummy stem blight (vine decline) |
Didymella bryoniae |
|
| 1574142 |
Watermelon Mosaic Virus |
Potyvirus WMV |
Yellow squash cultivar Meigs. |
| 1574141 |
Pythium diseases |
Pythium spp. |
Fruit rot caused by Pythium sp.
|
| 1574140 |
boron deficiency |
|
Close-up of lesions from 1574138. See 1574140 for cross section through the stem. |
| 1574139 |
boron deficiency |
|
Cross section through a broccoli hollow stem. |
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