The following plant disease highlights have been compiled from samples submitted to the University of Kentucky Plant Disease Diagnostic Laboratories from February 1 to February 25, 2020.
Diagnostic samples of agronomic crops have included russet mite on hemp.
On fruit, vegetable, and herb crops, we have diagnosed black rot (overwintering cankers) on grapevine; Phytophthora collar rot on apple; Pythium root rot on tomato; and thrips injury on basil.
On ornamentals and turf, we have diagnosed greenhouse whitefly on geranium; thrips injury on petunia; Volutella blight on pachysandra; Volutella canker, Macrophoma dieback, leaf miner injury, and oedema on boxwood; Seiridium canker on Leyland cypress; Botryosphaeria dieback, Cytospora canker, Rhizosphaera needlecast, and bagworm infestation on spruce; Phytophthora root/crown rot on juniper, chamaecyparis, and cherry laurel; winter injury and spider mite injury on arborvitae; and Pythium root dysfunction on turfgrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians