The PDDC is now once again accepting physical samples for diagnosis, but due to COVID-19, only with limited hours and limited sample processing capacity.  Click here for the current submission policy.  The PDDC is continuing to provide diagnoses through examination of digital photographs.  Digital diagnoses have not traditionally been included in the Wisconsin Disease Almanac, because such diagnoses are not verified through lab testing (critical in most situations for a diagnosis to be accurate).  However, in an attempt to keep clients as informed as possible, digital diagnoses will be included in the Almanac until normal PDDC operations resume.  For Almanac entries below, when a digital diagnosis would normally require a lab confirmation, the disease/disorder will be labeled as “suspected”.  The following diseases/disorders have been identified at the PDDC from July 18, 2020 through July 24, 2020.

PLANT/SAMPLE TYPE	DISEASE/DISORDER	PATHOGEN	COUNTY
FRUIT CROPS
Apple (Unspecified)	Cedar-Apple Rust Fire Blight Frogeye Leaf Spot Nectria Canker Russetting Water Stress (Suspected)	Gymnosporangium juniperi-virginianae Erwinia amylovora Botryosphaeria obtusa Tubercularia sp./ Nectria sp. None None	Lafayette Pierce Ozaukee Pierce Waushara McHenry (IL)
Apricot	Prunus Necrotic Ringspot (Suspected)	Prunus necrotic ringspot virus	Dane
Cherry	Bacterial Canker (Suspected)	Pseudomonas syringae	Milwaukee

To learn more about plant diseases and their control, as well as PDDC educational resources and activities, visit the PDDC website at pddc.wisc.edu, follow the clinic on Facebook and Twitter @UWPDDC or email pddc@wisc.edu to subscribe to the PDDC listserv “UWPDDCLearn”.

This article was posted in Apples, Disease and tagged Apples, apricot, Cherry, disease, PDDC, Plant Disease Diagnostic Clinic.