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

Brian Hudelson, Sean Toporek, Jake Kurczewski and Ann Joy

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 June 25, 2016 through July 1, 2016.

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

Field Crops
Corn, Anthracnose, Colletotrichum graminicola, Calumet, Columbia, Dodge, Waushara
Corn, Northern Corn Leaf Blight, Exserohilum turcicum, Buffalo, Dane, Dodge, Sauk, Jefferson

Forage Crops
Alfalfa, Aphanomyces Root Rot/ Seedling BlightAphanomyces euteiches, Dane

Fruit Crops 
Grape, Anthracnose, Spaceloma ampelinum, Buffalo
Grape, Black Rot, Phyllosticta ampelicida, Wood
Grape, Downy Mildew, Plasmopara viticola, Green Lake
Peach, Peach Leaf CurlTaphrina deformans, Walworth
Peach Prunus Necrotis Ringspot (Suspected), Prunus necrotic ringspot virus, Marquette
Raspberry, Cane Blight, Coniothyrium fuckelii, Winnebago
Raspberry, Root/Crown RotPythium sp., Fusarium sp., Cylindrocarpon sp., Winnebago

Vegetable Crops
Asparagus, Fusarium Root/ Crown Rot, Fusarium oxysporum, Dane
Chard, Altemaria Leaf Spot, Altemaria sp., Vemon
Lettuce, Bacterial Leaf Spot, Xanthomonas sp., Vemon
Potato, Black Leg, Dickeya sp., Portage
Snap Bean, Herbicide Damage, None, Dane
Tomato, Cucumber Mosaic, Cucumber mosaic virus, Ashland
Tomato, Early Blight, Altemaria soloni, Oneida
Tomato, Herbicide Damage, None, Dane
Tomato, Tobacco Mosaic, Tobacco mosaic virus, Ashland

Specialty Crops
Ginseng (American), Phytophthora Root RotPhytophthora cactorum, Delta (MI)
Ginseng (American), Rhizoctonia Root Rot, Rhizoctonia sp., Delta (MI)

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

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