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

Brian Hudelson, Ann Joy, Amy Gibbs, and Brooke Weber, Plant Disease Diagnostics Clinic

The PDDC receives samples of many plant samples from around the state. The following diseases/disorders have been identified at the PDDC since July 1, 2009:

PLANT/SAMPLE TYPE	DISEASE/DISORDER	PATHOGEN	COUNTY
FIELD CROPS
Corn	Anthracnose Yellow Leaf Blight	Colletotrichum graminicola Phyllosticta maydis	Columbia Columbia
Soybean	Growth Regulator Herbicide Damage	None	Marinette
FORAGE CROPS
Alfalfa	Aphanomyes Seedling Blight/Root Rot	Aphanomyces euteiches	Fond du Lac
FRUIT CROPS
Apple	Black Rot	Sphaeropsis sp.	McHenry (IL)
Grape	Growth Regulator Herbicide Damage	None	Dane
VEGETABLES
Tomato (‘Shanty’)	Bacterial Canker	Clavibacter michiganensis subsp. michiganensis	Green Lake

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