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

Brian Hudelson, Ann Joy, Joyce Wu, Tom Hinsenkamp, and Catherine Wendt, Plant Disease Diagnostics Clinic

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 August 9, 2014 through August 15, 2014.

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


Corn, Northern Corn Leaf Blight, Exserohilum turcicum, Sauk

Soybean, Charcoal Rot, Macrophomina phaseolina, Adams

Soybean, Soybean Cyst Nematode, Heterodera glycines, Adams


Apple, Frogeye Leaf Spot, Botryosphaeria obtuse, Columbia, La Crosse

Apple, Phomopsis Canker, Phomopsis sp., Columbia

Apple, Winter Injury, None, Buffalo, Columbia

Cranberry, Bitter Rot, Colletotrichum acutatum, Wood

Cranberry, Early Rot, Phyllosticta vacinii, Wood


Basil, Downy Mildew, Peronospora belbahrii, Kenosha

Melon, Cercospora Leaf Spot, Cercospora sp., Green

Onion, Downy Mildew, Peronospora destructor, Jefferson

Onion, Stemphylium Leaf Blight, Stemphylium sp., Jefferson

Potato, Late Blight, Phytophthora infestans, Portage

Pumpkin, Phytophthora Root and Crown Rot, Phytophthora sp., Rock

Squash, Angular Leaf Spot, Pseudomonas syringae pv. lachrymans, Sauk

Tomato, Bacterial Canker, Clavibacter michiganensis ps. Michiganensis, Wood

Tomato, Late Blight, Phytophthora infestans, Racine

Tomato, Yellow Top, None, Dodge


Soybean Soil, Soybean Cyst Nematode, Heterodera glycines, Fond du Lac, Iowa, Juneau

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


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