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 8, 2009:

PLANT/SAMPLE TYPE	DISEASE/DISORDER	PATHOGEN	COUNTY
FORAGE CROPS
Alfalfa	Aphanomyes Seedling Blight/Root Rot Crown Rot	Aphanomyces euteiches   Fusarium sp., Pythium sp.	Washington   Calumet, Washington
FRUIT CROPS
Cherry	Brown Rot Powdery Mildew	Monilia laxa Podosphaera sp.	Dane Dane
Cranberry	Root Rot	Pythium sp.	Wood
Pear	Phomopsis Canker Sphaeropsis Canker	Phomopsis sp. Sphaeropsis sp.	Dane Dane
Plum	Anthracnose	Colletotrichum sp.	Iowas
Strawberry	Root/Crown Rot	Pythium sp., Rhizoctonia sp.	Bayfield
VEGETABLES
Rhubarb	Root/Crown Rot	Colletotrichum sp., Pythium sp.	Waukesha
Tomato	Growth Regulator Herbicide Damage   Walnut Toxicity	None     None	Green Lake     Iowa

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