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.
Recent agronomic samples have included Diplodia ear rot, southern rust, and gray leaf spot on corn; frogeye leaf spot, Cercospora leaf blight, and sudden death syndrome on soybean; black shank and frogeye leaf spot on tobacco.
On fruit and vegetable crops, we have seen thread blight on apple and gooseberry; Cercospora leaf spot on cucumber; bacterial spot on pepper; downy mildew and powdery mildew on pumpkin; early blight, Septoria leaf spot, Fusarium wilt, and Pythium root rot on tomato.
On ornamentals and turf, we have diagnosed Pythium root rot, southern blight, Fusarium wilt, and web blight on chrysanthemum; Rhizoctonia root rot and Cercospora leaf spot on hydrangea; thread blight on viburnum; Guignardia leaf blotch on horsechestnut; anthracnose, Pythium root dysfunction, and Curvularia leaf blight on bentgrass; and brown patch on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians