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 July 20, 2013 through July 26, 2013.

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


Soybean, Root Rot, Pythium sp., Fusarium spp., Burnett, Winnebago


Apple, Black Rot, Sphaeropsis sp., Pierce

Raspberry, Raspberry Leaf Spot, Cylindrosporium rubi, Grant

Raspberry, Root Rot, Rhizoctonia sp., Fusarium sp., Bayfield


Horseradish, Root Rot, Fusarium spp., Pythium sp., Dunn

Tomato, Herbicide Damage, None, Barron

Tomato, Septoria Leaf Spot,  Septoria lycopersici,, Dane

Watermelon, Pythium Fruit Rot, Pythium sp., Waushara


Alfalfa Soil, Aphanomyces Root Rot, Aphanomyces euteiches race 2, Dane, Jefferson

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