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 white mold (Sclerotinia) on canola; and wheat soilborne mosaic and wheat spindle streak mosaic viruses on wheat. Greenhouse samples of ornamental and vegetable crops have included black root rot on petunia; ghost spot (Botrytis) on geranium; and Pythium root rot on geranium, gerbera, kale and tomato transplants.
On fruit crops, we have seen Botryosphaeria canker, Phytophthora root rot and Phomopsis twig dieback on blueberry; crown gall on apple and peach; peachtree borer injury with gummosis on nectarine; Leucostoma canker and fungal wood decay (Irpex sp.) on cherry.
On landscape ornamentals and turf, we have diagnosed Swiss needle cast on Douglas fir; Nectria canker on maple; Botryosphaeria canker on plum; black root rot on holly; Dothistroma needle blight on pine; Rhizosphaera needlecast on spruce; winter injury on boxwood, holly, euonymus, and Leyland cypress; and snow mold (Coprinus) and red thread on mixed lawn turfgrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians