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 23, 2014 through August 29, 2014.

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


Corn, Common Rust, Puccinia sorghi, Jo Davies (IL)

Corn, Root Rot, Pythium sp., Dane

Corn, Southern Corn Leaf Blight, Bipolaris maydis,Jo Davies (IL)

Soybean, Brown Spot, Septoria glycines, Iowa

Soybean, Downy Mildew, Peronospora manshurica, Dane

Soybean, Phyllosticta Leaf Spot, Phyllosticta sp., Dane

Soybean, Phytophthora Root and Stem Rot,  Phytophthora sp. , Lafayette

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


Apple, Sphaeropsis Canker, Sphaeropsis sp., Lincoln

Blackberry, Septoria Leaf Spot, Septoria rubi, Vernon

Cranberry, Bitter Rot, Colletotrichum acutatum, Colletotrichum gloeosporioides, Jackson

Cranberry, Blotch Rot, Physalospora vaccinii, Jackson

Cranberry, Early Rot, Phyllosticta vacinii, Wood

Cranberry, Tobacco Streak, Tobacco streak virus, Wood

Grape, Downy Mildew, Plasmopara viticola, Milwaukee

Grape, Rupestris Speckle, None, Dane

Pear, Sphaeropsis Canker, Sphaeropsis sp., Racine


Pepper, Tomato Spotted Wilt, Tomato spotted wilt virus, Columbia

Squash (Acorn), Root Rot, Pythium, Monroe

Sweet Corn, Northern Corn Leaf Blight, Exserohilum turcicum, Columbia

Potato, Cercospora Leaf Blotch, Cercospora sp., Columbia

Potato, Early Blight, Alternaria solanit, Columbia

Potato, Late Blight, Phytophthora infestans, Portage

Tomato, Early Blight, Alternaria solanit, Columbia

Tomato, Late Blight, Phytophthora infestans, Marinette, Waukesha

Tomato, Septoria Leaf Spot, Septoria lycopersici, Columbia, Dane

Tomato, Sour Rot, Geotrichum sp., Dane


Alfalfa Soil, Aphanomyces Seedling Blight, Aphanomyces euteiches race 2, Buffalo, Marathon, Scott (MN)

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

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