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

Brian Hudelson, Sean Toporek, Ann Joy and Joyce Wu

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 July 11, 2015 through July 17, 2015.

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

Field crops
Corn, Eyespot, Kabatiella zeae, Marinette
Corn, Yellow Leaf Blight, Phyllosticta maydis, Marinette
Soybean, Brown SpotSeptoria glycines, Wood
Soybean, Frogeye Leaf Spot, Cercospora sojina, Waushara
Soybean, Root Rot, Pythium sp., Fusarium sp., Wood
Soybean, Target Spot, Corynespora cassiicola, Waushara
Wheat, Cephalosporium Stripe, Cephalosporium gramineum, Dodge

Fruit crops
Blueberry, Gloeosporium Leaf Spot, Gloeosporium sp., Washburn
Grape, Black Rot, Phyllosticta ampelicida, Green
Pear, Black Rot, Sphaeropsis sp., Dane, Waukesha
Pear, Cytospora Canker, Cytospora sp., Dane
Pear, Frogeye Leaf Spot, Sphaeropsis sp., Waukesha
Pear, Phomopsis Canker, Phomopsis sp., Dane
Strawberry, Angular Leaf Spot, Xanthomonas fragariae, Columbia
Strawberry, Common Leaf Spot, Mycosphaerella fragariae, Columbia

Specialty crops
Ginseng, Disappearing Root Rot, Cylindrocarpon destructans, Portage
Ginseng, Rusty (Rusted) Root, Rhexocercosporidium sp., Portage

Asparagus, Root/Crown RotFusarium oxysporum, Waushara
Cucumber, Angular Leaf Spot, Pseudomonas syringae pv. lachrymans, Portage
Cucumber Mosaic, Cucumber mosaic virus, Waukesha
Garlic, Leek Yellow Strip (Suspected), Leek yellow strip virus, Waukesha
Garlic, Stem and Bulb (Bloat) Nematode, Ditylenchus dipsaci, Waukesha
Garlic, Tobacco Mosaic, Tobacco mosaic virus, Waukesha
Onion, Downy MildewPeronospora destructor, Fillmore (MN)
Onion, Stephylium Leaf Blight, Stemphylium sp., Fillmore (MN)
Pepper, Bacterial Spot, Xanthomonas sp., Washington
Pepper, Syringae Leaf Spot, Pseudomonas syringae, Washington
Pumpkin, Cucumber Mosaic, Cucumber mosaic virus, Jefferson
Squash, Cucumber MosaicCucumber mosaic virus, Jefferson
Tomato, Bacterial Canker, Clavibacter michiganensis subsp. michiganensis, Sheboygan, Waushara
Tomato, Cucumber MosaicCucumber mosaic virus, Green, Oconto, Sheboygan
Tomato, Fusarium Wilt, Fusarium oxysporum, Waushara
Tomato, Root RotPythium sp, Sheboygan
Tomato, Tobacco Mosaic, Tobacco mosaic virus, Green, Oconto, Sheboygan, Walworth
Tomato, Tomato Spotted Wilt, Tomato spotted wilt virus, Iowa, Oconto

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