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

Brian Hudelson, Ann Joy, Erin DeWinter and Joyce Wu, 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 July 27, 2013 through August 2, 2013.

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

FORAGE CROPS,

Alfalfa, Aphanomyces Root Rot, Aphanomyces euteiches, Dane

Alfalfa, Crown Rot, Fusarium spp., Dane, Grant

Alfalfa, Pythium Root Rot, Pythium sp., Dane, Grant

Alfalfa, Rhizoctonia Root Rot, Rhizoctonia solani, Dane

FRUIT CROPS,

Apple, Root/Crown Rot, Pythium sp., Fusarium sp., Clark

Blueberry, Chlorosis, None, Langlade

Blueberry, Fruit Rot, Colletotrichum gloeosporioides, Langlade

Blueberry, Gray Mold/Botrytis Blight, Botrytis cinerea, Langlade

Blueberry, Phomopsis Canker, Phomopsis sp., Langlade

Blueberry, Sphaeropsis Canker, Sphaeropsis sp., Langlade

Blueberry, Water Stress, None, Langlade

Pear, Anthracnose, Gloeosporium sp., Racine

Pear, Chemical Toxicity, None, Racine

Raspberry, Root/Crown Rot, Phytophthora sp., Pythium sp., Rhizoctonia sp., Fusarium sp., Jefferson, La Crosse, McHenry (IL)

VEGETABLES,

Potato , Late Blight, Phytophthora infestans, Dunn

Pumpkin, Bacterial Leaf Spot, Xanthomonas campestris pv. cucurbitae, Grant

Tomato, Bacterial Speck, Pseudomonas syringae pv. Tomato, Grant

Tomato, Herbicide Damage, None, Brown

Tomato, Septoria Leaf Spot, Septoria lycopersici, Grant, Sauk

SOIL,

Soybean Soil, Soybean Cyst Nematode, Heterodera glycines, Oconto

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