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

Brian Hudelson, Ann Joy, Erin DeWinter and Joyce Wu, Plant Disease Diagnostics Clinic

The PDDC receives samples of many plant and soil samples from around the state.  The following diseases/disorders have been identified at the PDDC from August 24, 2013 through August 30, 2013.

Plant/Sample Type, Disease/Disorder, Pathogen, County

Corn, Common Rust, Puccinia sorghi, Dane

Soybean, Anthracnose, Colletotrichum truncatum, Rock

Soybean, Brown Spot, Septoria glycines, Calumet, Rock

Soybean, Cercospora Leaf Blight, Cercospora kikuchii, Sheboygan

Soybean, Frogeye Leaf Spot, Cercospora sojina, Rock

Soybean, Ozone Injury, None, Calumet

Soybean, Stem Canker, Diaporthe phaseolorum, Rock

Soybean, Target Spot, Corynespora cassiicola, Rock

FRUIT CROPS,

Apple, Brown Rot, Monilinia sp., Columbia

Grape, Berry Rot, Miscellaneous yeasts, Vernon

Grape, Bird’s Eye Rot, Sphaceloma ampelinum, Vernon

Grape, Blue Mold, Penicillium sp., Vernon

Raspberry, Anthracnose, Sphaceloma necator, Pierce

Raspberry, Root/Crown Rot, Phytophthora sp., Pythium sp., Fusarium sp.,Cylindrocarpon sp., Dane, Lincoln

VEGETABLES,

Garlic, Stem and Bulb/Bloat Nematode, Ditylenchus dipsaci, Dane

Melon, Alternaria Leaf Spot, Alternaria sp., Crawford

Melon, Cercospora Leaf Spot, Cercospora sp., Crawford

Melon, Fusarium Wilt, Fusarium oxysporum, Waushara

Parsnip, Pseudocercosporella Leaf Blight, Pseudocercosporella sp., Crawford

Tomato, Septoria Leaf Spot, Septoria lycopersici, La Crosse

Zucchini, Fusarium Wilt, Fusarium oxysporum, Green Lake

SPECIALTY CROPS,  

Hop, Gray Mold, Botrytis sp., Dodge

SOIL,

Alfalfa Soil, Aphanomyces Seedling Blight, Aphanomyces euteiches race 1, Manitowoc

Soybean Soil, Soybean Cyst Nematode, Heterodera glycines, Buffalo, Jefferson, Rock, Walworth, Washington

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