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.
During the month of October, diagnostic samples of agronomic crops have included Fusarium ear rot, anthracnose stalk rot, Gibberella stalk and ear rot, and charcoal rot on corn; frogeye leaf spot, purple seed stain, and compaction on soybean; frogeye leaf spot, angular leaf spot, potyvirus complex, and barn rot (various fungal and bacterial species) on tobacco.
On fruit and vegetable crops, we have diagnosed the black root rot complex on strawberry; scab on pecan; angular leaf spot on bean; Phytophthora blight on pepper, cucumber, squash, and pumpkin; Microdochium blight, Fusarium crown rot, and Fusarium fruit rot on pumpkin; scurf on sweetpotato; and leaf mold on tomato.
On ornamental and turf samples, we have seen Rhizoctonia root rot on aster; Cercospora leaf spot on zinnia; Pythium root rot and high soluble salts on poinsettia; Marssonina leaf spot on birch; black spot on elm; gloomy scale and Verticillium wilt on maple; bacterial leaf scorch, powdery mildew, anthracnose, and jumping oak gall on oak; white pine root decline on pine; take-all patch on bentgrass; and brown patch on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians