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 July 30, 2016 through Aug 5, 2016.

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

Field Crops
Soybean, Fusarium Root and Stem Rot, Fusraium sp., Buffalo
Soybean, Phytophthora Root and Stem RotPhytophthora sp., Buffalo
Soybean, Rhizoctonia Root and Stem Rot, Rhizoctonia sp.,  Buffalo
Soybean, Sudden Death Syndrome, Fusarium virguliforme, Rock

Fruit Crops
Apple, Cedar-Apple RustGymnosporangium sp., Dane
Apple, Chemical Burn, none, Dane
Apple, Root Rot, Phytophthora sp., Pythium sp., Dane

Pear, Chemical Burn, none, Dane 

Vegetable Crops
Cucumber, Anthracnose, Colletotrichum orbiculare, Dane

Kale, Fusarium Stem Rot, Fusarium sp., Dane

Potato, Rhizoctonia Canker, Rhizoctonia solani, Langlade

Pumpkin, Angular Leaf Spot, Pseudomonas syringae pv. lachrymans, Dane

Tomato, Bacterial Canker/Bird’s-Eye Fruit Spot, Clavibacter michiganensis subsp. michiganensis, Dane
Tomato, Bacterial Speck, Pseudomonas syringae pv. tomato, Fillmore (MN)
Tomato, Blossom End Rot , none, Washington
Tomato, Cucumber Mosaic, Cucumber mosaic virus, Jefferson
Tomato, Cuticle Cracking, none, Crawford
Tomato,  Early BlightAlternaria  solon, Fillmore (MN)
Tomato,  Septoria Leaf SpotSeptoria lycopersici, Grant, Oneida, Fillmore (MN)
Tomato, Tobacco Mosaic, Tobacco mosaic virus, Jefferson

Zucchini, Plectosporium Blight, Plectosporium tabacinum, Dane

Specialty Crops
Hop, Downy MildewPseudoperonospora humble, Wood