The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit and vegetables, and ornamentals.
During the past week, field crop diagnoses included summer black stem on alfalfa; brown spot and potassium deficiency on soybean; Pythium root rot, transplant shock, temporary phosphorus deficiency, environmental/physiological leaf spotting, frogeye leaf spot, soreshin, black shank, tobacco ringspot virus and tomato spotted wilt virus on tobacco.
On fruit and vegetable samples, diagnoses included Phomopsis twig blight on blueberry; fire blight on apple; bacterial leaf spot on plum; Fusarium root/stem rot and Fusarium wilt on bean; common smut on sweet corn; Alternaria leaf spot on rhubarb; buckeye rot, Septoria leaf spot, leaf mold, early blight, Fusarium wilt, blossom end rot and catfacing on tomato.
On ornamentals, we diagnosed Cryptosporella canker and rose rosette virus on rose; Volutella canker and Macrophoma leaf blight on boxwood; powdery mildew on hydrangea; scab on crabapple; and anthracnose on ash.
by Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians