The following plant disease highlights from the University of Kentucky Plant Disease Diagnostic Laboratories represent recent sample submissions from vegetables and ornamentals.
Diseases diagnosed on greenhouse/high tunnel vegetables during February have included Botrytis gray mold on lettuce; white mold (Sclerotinia) on carrot and mustard; tomato spotted wilt virus and Pythium damping off on tomato; Rhizoctonia crown rot (progressing into leaf blight) on spinach.
On greenhouse ornamentals we have diagnosed Pythium root/stem rot on angelonia; Pythium damping-off on creeping thyme; black root rot on calibrachoa; crown gall on lobelia; and blight (Calonectria) on boxwood.
Other ornamental samples included black knot on Prunus; wet feet on holly; and Rhizosphaera needle cast on spruce.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians