The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
Recent agronomic samples have included target spot, Rhizoctonia damping off, Pythium root rot, and heat injury on tobacco transplants.
On fruit and vegetable crops, we have seen common leaf spot (Mycosphaerella) and bacterial leaf spot on strawberry; cane blight on blackberry; winter injury on raspberry and blackberry; leaf curl on nectarine; Sclerotinia rot on cabbage; and Pythium root rot on tomato.
On ornamentals and turf, we have diagnosed Rhizoctonia root/stem rot on lavender; powdery mildew on petunia; Botrytis blight on vinca; bacterial blight on peony; fire blight on pear; Entomosporium leaf spot on photinia; Seiridium and Botyrosphaeria cankers on Leyland cypress; Dothistroma needle blight on pine and spruce; winter injury on numerous landscape trees and shrubs; take-all and “wet feet” with Pythium infection on bentgrass; and red thread on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians