UW-Madison/Extension Plant Disease Diagnostic Clinic (PDDC) Update

Brian Hudelson, Sean Toporek, Jake Kurczewski and Ann Joy

The PDDC receives samples of many plant and soil samples from around the state. The following diseases/disorders have been identified at the PDDC from September 24, 2016 through September 30, 2016.

Plant/Sample Type, Disease/Disorder, Pathogen, County

Field Crops
Corn, Anthracnose Stalk Rot, Colletotrichum graminicola, Portage
Corn, Common Rust, Puccinia sorghi, Rock
Corn, Diplodia (Stenocarpella) Ear Rot, Stenocarpella sp., Grant
Corn, Eyespot, Kabatiella zeae, Rock
Corn, Fusarium Ear Rot, Fusarium sp., Grant
Corn, Fusarium Root Rot, Fusarium sp., Rock
Corn, Gray Leaf Spot, Cercospora sp., Rock
Corn, Helminthosporium Root Rot, Exserohilum pedicellatum, Rock
Corn, Northern Corn Leaf Blight, Exserohilum turcicum, Rock
Corn, Penicillium Ear rot, Penicillium sp., Grant
Corn, Pythium Root Rot, Pythium sp., Rock
Corn, Pythium Stalk Rot, Phythium sp., Portage
Corn, Rhizoctonia Stalk Rot, Rhizoctonia sp., Portage
Sorghum, Grain Weathering, Alternaria sp., Calumet

Fruit Crops
Apple (‘Gala’), Necrotic Leaf Blotch, None, Outagamie
Apple (‘Honeycrisp’), Honeycrisp Leaf Necrosis, None, Outagamie
Apple (Unspecified), Apple Scab, Ventura inaequalis, Portage
Apple (Unspecified), Bitter Pit, None, Jefferson
Apple (Unspecified), Bitter Rot, Collectotrichum gloeosporioides, Langlade
Apple (Unspecified), Black Rot (Canker), Sphaeropsis sp., Clark
Apple (Unspecified), Flyspeck, Schizothyrium pomi, Green, Langlade
Apple (Unspecified), Phomopsis Fruit Rot, Phomopsis sp., Langlade
Apple (Unspecified), Phytophthora Root Rot, Phytophthora sp., Outagamie
Apple (Unspecified), Sooty Blotch, Miscellaneous sooty blotch fungi, Green, Langlade
Cherry, Cherry Leaf Spot, Blumeriella jaapii, Racine
Raspberry, Spur Blight, Didymella applanata, Marathon

Vegetable Crops
Garlic, Embellisia Skin Blotch and Bulb Canker, Embellisia allii, Dane
Garlic, Fusarium Bulb Rot, Fusarium sp., Dane
Potato, Bacterial Soft Rot, Pectobacterium sp., Portage
Potato, Black Heart, None, Portage
Potato, Heat Necrosis, None, Portage
Potato, Internal Browning, None, Portage
Squash (Spaghetti), Black Rot/ Gummy Stem Blight, Didymella bryoniae, Monroe
Squash (Winter), Sour Rot, Geotrichum sp., Dane
Pepper, Unidentified Viral Disease, Unidentified virus, Dane
Tomato, Late Blight, Phytophthora infestans, Juneau
Tomato, Septoria Leaf Spot, Septoria lycopersici, Dane
Tomato, Tobacco Mosaic, Tobacco mosaic virus, Walworth


For additional information on plant diseases and their control, visit the PDDC website at pddc.wisc.edu.

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