The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
During the past week, agronomic crop diagnoses included Rhizoctonia stem blight on alfalfa; brown stripe and anthracnose on orchardgrass; frogeye, brown spot, charcoal rot, sudden death syndrome, soybean cyst nematode, and compaction on soybean; black shank, Fusarium wilt, manganese toxicity, potassium deficiency, and weather fleck on tobacco.
On fruit and vegetable samples, diagnoses included cane blight on blackberry; anthracnose on bean; bacterial spot on pepper; Septoria leaf spot, early blight, leaf mold, and Fusarium wilt on tomato.
On ornamentals and turf, we diagnosed Pythium root rot, Rhizoctonia web blight, Fusarium wilt and bacterial spot on chrysanthemum; Volutella blight on pachysandra; white smut on gaillardia; powdery mildew and spot anthracnose on dogwood; Armillaria root rot on cherrylaurel; Volutella canker on boxwood; anthracnose and Phyllosticta leaf spot on maple; Rhizosphaera needlecast on spruce; and brown patch on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians