UW-Madison/Extension Plant Disease Diagnostic Clinic (PDDC) Update August 7, 2020
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 August 1, 2020 through August 7, 2020.
| PLANT/SAMPLE TYPE | DISEASE/DISORDER | PATHOGEN | COUNTY |
| FRUIT CROPS | |||
| Apple | Fire Blight | Erwinia amylovora | Brown |
| Blueberry | Fertility/Soil pH Issues (Suspected) | None | Douglas |
| Cherry | Cherry Leaf Spot (Suspected) | Blumeriella jaapii | Dane |
| Currant (White) | Virus Disease | Unspecified virus | La Crosse |
| Pear | Chemical Burn (Suspected) Fire Blight (Suspected) Pear Scab Transplant Shock | None Erwinia amylovora Venturia pirina None | Dane Chippewa Richland Monroe |
| Plum | Anthracnose | Gloeosporium sp. | Monroe |
| Raspberry | Root/Crown Rot (Suspected) | Unspecified root/crown rot fungi/water molds | Calumet |
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, Berries, Disease and tagged Anthracnose, Apples, Blueberries, chemical burn, Cherry Leaf Spot, Currants, disease, fertility issues, Fire Blight, PDDC, pear, pear scab, Plant Disease Diagnostic Clinic, plums, Raspberries, Root/Crown Rot, Soil pH, transplant shock.