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

Brian Hudelson, Ann Joy, Joyce Wu, Tom Hinsenkamp, and Catherine Wendt,
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 16, 2014 through August 22, 2014.

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


Corn, Goss’ Wilt, Clavibacter michiganensis subsp. michiganensis, Lafayette

Soybean, Pod and Stem Blight, Phomopsis sp., Buffalo

Soybean, Root Rot, Rhizoctonia solani, Pythium sp., Fusarium spp., Green Lake, Sheboygan


Apple, Cytospora Canker, Cytospora sp., Florence

Cranberry, Early Rot, Phyllosticta vacinii, Wood

Raspberry, Cane Blight, Coniothyrium fuckelii, Racine

Strawberry, Root Rot, Rhizoctonia solani, Pythium sp., Fusarium spp., Waupaca


Basil, Downy Mildew, Peronospora belbahrii, Washington

Dill, Cercosporoid Leaf Blight, Passalora punctum, Barron

Pepper, Bacterial Spot, Xanthomonas sp., Shawano

Squash (Winter), Phytophthora Crown and Root Rot, Phytophthora capsici, Racine

Tomato, Black Dot Root Rot, Colletotrichum sp., Dane

Tomato, Bacterial Canker, Clavibacter michiganensis ps. Michiganensis, Racine

Tomato, Dagger Nematode*, Xiphinema sp., Dane

Tomato, Septoria Leaf Spot, Septoria lycopersici, Portage, Racine, Shawano


Ginseng, Rusty Root, Rhexocercosporidium sp., Delta (MI)

Tobacco, Barn Rot, Rhizopus sp., Rock

*Diagnosis performed by the UW-Madison Nematode Diagnostic Lab

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