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 anthracnose, common leaf spot, Lepto leaf spot, and summer black stem on alfalfa; common rust and gray leaf spot on corn; Rhizoctonia root rot, anthracnose, soybean cyst nematode, and pod/stem blight on soybean; Pythium root/stem rot on hemp; head blight on wheat; black shank, tomato spotted wilt, Fusarium wilt, target spot, manganese toxicity, and transplant shock on tobacco.
On fruit and vegetable samples, we have diagnosed anthracnose fruit rot on strawberry; black rot on grape; white drupelet disorder and cane blight on blackberry; anthracnose fruit rot on apricot; bacterial spot on peach; angular leaf spot and Pythium root/stem rot on bean; Rhizoctonia root/stem rot on cabbage; bacterial wilt and anthracnose on cucumber; Alternaria leaf blight and anthracnose on cantaloupe; bacterial spot on pepper; bacterial spot, early blight, Septoria leaf spot, leaf mold, Pythium, and Rhizoctonia root/stem rots, southern blight, and blossom end rot on tomato.
Ornamental and turf samples included rust on hollyhock; Pythium root rot on phlox; powdery mildew on bee balm; Phomopsis dieback on holly; Volutella canker and Macrophoma leaf blight on boxwood; Rhizosphaera needlecast on spruce; and brown patch on fescue.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians