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

Brian Hudelson, Sean Toporek, Catherine Wendt, Claire Wisniewski, 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 October 17, 2015 through October 23, 2015.

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

Field Crops
Anthracnose Stalk Rot, Colletotrichum graminicola, Lafayette
Corn, Gibberella Stalk Rot, Gibberella zeae, Lafayette
Soybean, Root Rot, Rhizoctonia sp., Pythium sp., Fusarium sp, Monroe

Forage Crops
Alfalfa, Crown Rot, Fusarium sp., Columbia

Fruit Crops
Apple, Cedar-Apple Rust, Gymnosporangium sp, Portage
Apple, Root/Crown Rot, Pythium sp., Fond du Lac
Plum, Anthracnose, Gloeosporium sp, Portage
Plum, Bacterial Canker, Pseudomonas syringae, Portage

Tomato, Late Blight, Phytophthora infestans,Waukesha
Tomato, Septoria Leaf Spot, Septoria lycopersici, Jefferson, Juneau

Soybean Soil, Soybean Cyst Nematode, Heterodera glycines, Dane, Green, Rock

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