UW-Madison/Extension Plant Disease Diagnostic Clinic (PDDC) Update
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 11, 2020 through July 17, 2020.
PLANT/SAMPLE TYPE | DISEASE/DISORDER | PATHOGEN | COUNTY |
FRUIT CROPS | |||
Apple (‘Porter’s Perfection’) | Hardiness Issues (Suspected) Root Rot | None Fusarium sp., Rhizoctonia sp. | Waupaca Waupaca |
Apple (Unspecified) | Apple Scab (Suspected) Fertility Issues (Suspected) Frogeye Leaf Spot (Suspected) Gymnosporangium Rust Honeycrisp Leaf Chlorosis | Venturia inaequalis None Botryosphaera obtusa Gymnosporangium sp. None | St. Croix St. Croix St. Croix St. Croix St. Croix |
Apricot (Chinese) | Hardiness Issues (Suspected) Root Rot | None Fusarium sp. | Waukesha Waukesha |
Cherry | Brown Rot Cherry Leaf Spot (Suspected) | Monilinia fructicola Blumeriella jaapii | Winnebago Rock |
Gooseberry | Gloeosporidiella Leaf Spot | Gloeosporidiella sp. | Lafayette |
Grape | Black Rot Downy Mildew | Guignardia bidwellii Plasmopara viticola | Sheboygan Sheboygan |
Peach | Fertility Issues (Suspected) | None | Vernon |
Raspberry | Anthracnose (Suspected) Fertility Issues (Suspected) Raspberry Leaf Spot (Suspected) Virus Disease (Suspected) | Sphaceloma necator None Cylindrosporium rubi Unspecified virus | Brown Dane Brown Dane |
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, Grapes and tagged Ann Joy, Apples, apricot, Brian Hudelson, Cherry, disease, Gooseberry, Grapes, PDDC, Peach, Plant Disease Diagnostic Clinic, Raspberries, Sue Lueloff.