UW/ UWEX Plant Disease Diagnostic Clinic (PDDC) Update, August 10

Brian Hudelson, Sue Lueloff, John Lake 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 29, 2017 through August 4, 2017.

PLANT/SAMPLE TYPE, DISEASE/DISORDER, PATHOGEN, COUNTY

FIELD CROPS

Corn, Northern Corn Leaf Blight, Exserohilum turcicum, Adams

FRUIT CROPS

Apple, Arthracnose, Gloeosporium sp., Bayfield

Blueberry, Gloeosproium Leaf Spot and Stem Canker, Gloeosporium sp., Bayfield, Oneida

Cherry, Anthracnose, Bacterial Canker, Brown Rot, Cherry Leaf Spot, Gloeosporium sp., Pseudomonas syringae, Monilinia sp., Blumeriella jaapii, Sauk, Dane, Dane, Dane

Cranberry, Phyllosticta Leaf Spot, Upright Dieback, Phyllostickta elongata, Phomopsis sp., Vilas, Vilas

Grape, Herbicide Damage, None, Columbia

VEGETABLE CROPS

Cucumber, Anthracnose, Colletotrichum orbiculare, Sauk

Onion, Purple Blotch, Stemphylium Leaf Blight, Alternaria porri, Stemphylium sp., Sauk, Sauk

Pumpkin, Bacterial Wilt, Erwinia tracheiphila, Milwaukee

Squash (Summer), Bacterial Wilt, Erwinia tracheiphila, Milwaukee

Tomato, Bacterial Canker, Bacterial Speck, Septoria Leaf Spot, Clavibacter michiganensis subsp. michiganensis, Pseudomonas syringae pv. tomato, Septoria lycopersici, Douglas, Sauk, La Crosse, Milwaukee

For additional information on plant diseases and their control, visit the PDDC website at pddc.wisc.edu. Follow the clinic on Facebook and Twitter @UWPDDC.

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