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

Brian Hudelson, Ann Joy, Erin DeWinter and Joyce Wu, 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 17, 2013 through August 23, 2013.

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


Corn, Common Rust, Puccinia sorghi, Dane

Soybean, Dicamba Injury, None, Waupaca

Soybean, Root Rot,  Pythium sp., Fusarium spp., Dodge, Fond du Lac, Lafayette, Marathon, St. Croix

Soybean, Sudden Death Syndrome, Fusarium solani, Dodge

Soybean, Target Spot, Corynespora cassiicola, Fond du Lac


Alfalfa, Aphanomyces Root Rot, Aphanomyces euteiches, Dane

Alfalfa, Crown Rot,  Fusarium spp., Dane

Alfalfa, Phytophthora Root Rot, Phytophthora sp., Dane

Alfalfa, Pythium Root Rot, Pythium sp., Dane


Apple, Root/Crown Rot, Fusarium sp., Waukesha

Apple, Sphaeropsis Canker, Sphaeropsis sp., Waukesha

Cherry, Cherry Leaf Spot, Blumeriella jaapii, Shawano

Cherry, Powdery Mildew, Podosphaera clandestina, Shawano

Raspberry, Root/Crown Rot, Phytophthora sp., Dane


Sweet Corn, Eyespot, Aureobasidium zeae, Green Lake

Tomato, Fusarium Wilt, Fusarium oxysporum, Will (IL)

Tomato, Late Blight, Phytophthora infestans, Sauk

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