The following plant disease highlights from the University of Kentucky Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
Diseases diagnosed on agronomic crops during the past week have included barley yellow dwarf virus (BYDV) and wheat spindle streak mosaic virus (WSSMV) on spelt; stripe rust, speckled leaf blotch (Septoria), and BYDV on wheat; Pythium root rot and Rhizoctonia damping-off on tobacco transplants.
On fruit and vegetable samples, we have diagnosed gray mold on strawberry; blister mite on pear; black dot on potato; Pythium root rot, thrips and aphid infestation, and chemical injury on tomato.
Ornamental and turf samples included Phoma dieback on vinca; oedema and spider mite injury on geranium; powdery mildew on photinia; Stigmina needle blight and Rhizosphaera needle cast on spruce; and powdery mildew on bluegrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians