The following plant disease highlights from the University of Kentucky Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
Diseases diagnosed on agronomic crops during the past week have included Pythium root rot and common rust on corn; brown spot on soybean; anthracnose on cereal rye; head blight on wheat; and Pythium root rot, black shank, and transplant shock on tobacco.
On fruit and vegetable samples, we have diagnosed anthracnose fruit rot, common leaf spot, and Phomopsis leaf blight on strawberry; bacterial spot on apricot; cedar-apple rust, fire blight, frogeye leaf spot, and bitter rot on apple; alfalfa mosaic virus on pepper; blackleg on potato; bacterial spot, early blight, Septoria leaf spot, powdery mildew, timber rot (Sclerotinia), and Pythium root rot on tomato; gummy stem blight, Pythium and Rhizoctonia root rots on watermelon.
Ornamental and turf samples included leaf blotch and powdery mildew on peony; powdery mildew on dogwood; anthracnose on ash, maple, and tuliptree; Rhizosphaera and Stigmina needle diseases on spruce; brown patch on fescue; dollar spot on bentgrass; and summer patch and red thread on bluegrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians