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 Rhizoctonia damping off, Pythium root rot, and injuries from heat, cold, and chemical exposure on tobacco transplants; and black rot on rapeseed.
On fruit and vegetable crops, we have seen common leaf spot (Mycosphaerella) and anthracnose on strawberry; winter injury on raspberry and blackberry; leaf curl on peach; Sclerotinia rot and tipburn on cabbage; Pythium root rot, timber rot, and Botrytis fruit rot on tomato; and black spot (Alternaria) on watermelon.
On ornamentals and turf, we have diagnosed Rhizoctonia root/stem rot on sedum; Botrytis blight on calibrachoa and petunia; Sclerotinia stem rot on lobelia; anthracnose on ash; Rhizosphaera needlecast and Stigmina needle blight on spruce; and take-all on bentgrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians