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 August 13, 2016 through August 19, 2016.

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

Field Crops
Corn, Gibberella Stalk Rot, Fusarium graminearum, Dane
Soybean, Stem Canker, Diaporthe phaseolorum, Rock
Soybean, Sudden Death Syndrome, Fusarium virguliforme, Rock

Fruit Crops
Blueberry, Gloeosporium Leaf Spot and Stem Canker, Gloeosporium sp., Dunn
Blueberry, Phomopsis Twig Blight/ Canker, Phomopsis sp., Clark, Dunn
Blueberry, Ripe Rot, Colletotrichum gloeosporioides, Clark
Cranberry, Upright Dieback, Phomopsis vaccinii, Monroe
Pear, Fire Blight, Erwinia amylovora, Dane

Vegetable Crops
Beet, Bacterial Soft RotPectobacterium sp., Monroe
Eggplant, Root Rot, Pythium sp., Rhizoctonia sp., Dane
Onion, Slippery Skin, Burkholderia gladioli pv. allicola, Dane
Pepper, Sunscald, None, Dane
Potato, Late Blight, Phytophthora infestans, Polk
Tomato, Bacterial Canker, Clavibacter michiganensis subsp. michiganensis, Walworth
Tomato, Ghost Spot, Botrytis cinerea, Dane
Tomato, Late Blight, Phytophthora infestans, Polk
Tomato, Leaf Mold, Passalora fulva, Dane
Tomato, Septoria Leaf Spot, Septoria lycopersici, Dane, Portage

Soybean Soil, Soybean Cyst Nematode, Heterodera glycines, Outagamie, Pepin

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