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.
Recent agronomic samples have included common rust on corn; anthracnose and rust on forage grasses; rough leaf spot (Ascochyta) on sorghum; downy mildew, Cercospora leaf blight, and sudden death syndrome on soybean; black shank, target spot, frogeye leaf spot, angular leaf spot, tobacco mosaic virus, potyvirus complex, and potato virus Y on tobacco.
On fruit and vegetable crops, we have seen downy mildew and Phylloxera galls on grape; common bacterial blight, Fusarium and Rhizoctonia root/stem rots, and Cercospora leaf spot on bean; bacterial spot and anthracnose on pepper; downy mildew and powdery mildew on pumpkin; Septoria leaf spot on tomato; belly rot and flyspeck on watermelon.
On ornamentals, we have diagnosed web blight on chrysanthemum; boxwood blight and Volutella canker on boxwood; tar spot and Phyllosticta leaf spot on maple; bacterial leaf scorch on lilac and oak (pin, red and shingle).
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians