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 stress from compaction and shallow planting on corn; thrips injury, postassium deficiency, and compaction stress on soybean; Pythium root rot, target spot, blackleg, and black shank on tobacco; and stalk borer injury on hemp.
On fruit and vegetable crops, we have seen black rot on grape; fire blight on apple; bacterial soft rot on cabbage; white rot (Sclerotium) on garlic; Rhizoctonia stem rot on kale; Stemphyllium leaf blight on onion; early blight, Septoria leaf spot, leaf mold, bacterial canker, bacterial pith necrosis, Fusarium wilt, stalk borer injury, and tomato spotted wilt virus on tomato.
On ornamentals and turf, we have diagnosed Rhizoctonia root rot on lavender; leaf/flower gall on azalea; cedar-quince rust on hawthorn; powdery mildew and anthracnose on dogwood; Botryosphaeria canker on maple; and brown patch on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians