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 and other problems diagnosed on agronomic crops during the past week have included gray leaf spot and stinkbug injury on corn; common leaf spot on alfalfa; black shank, Fusarium wilt, frogeye leaf spot, bacterial soft rot, scald (from saturated soils), low pH symptoms, and potassium deficiency on tobacco.
On fruit and vegetable samples, we have diagnosed black rot on grape; cane blight on blackberry; brown rot, scab and bacterial spot on peach; Pythium blight, Rhizoctonia root/stem rot, and ashy stem blight on bean; Cercospora leaf spot and Alternaria leaf blight on melon; bacterial spot and Rhizoctonia stem rot on pepper; bacterial soft rot and poor pollination on squash; bacterial spot, bacteria speck, early blight, Septoria leaf spot, southern blight, ripe rot, and blossom end rot on tomato.
Ornamental and turf samples included anthracnose on liriope; cedar-quince rust on hawthorn; filbert blight on contorted filbert; Botryosphaeria canker on maple; anthracnose and powdery mildew on oak; tip blight on pine; Seiridium canker on Leyland cypress; Cercospora leaf spot and Venturia leaf blight on willow; and slime mold on turf.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians