The following plant disease highlights have been compiled from samples submitted to the University of Kentucky Plant Disease Diagnostic Laboratories from October 1 to October 29, 2019.
Diagnostic samples of agronomic crops have included soybean stem borer on soybean; Pythium root rot, Phomopsis dieback, and charcoal rot on hemp.
On fruit and vegetable crops, we have diagnosed Phytophthora crown rot on blueberry and strawberry; Sphaerulina leaf spot and cane blight raspberry; Phomopsis fruit rot, bitter rot, black rot, and grape berry moth on grape; cedar-apple rust and frogeye leaf spot on apple; thread blight on pear; pecan weevil and scab on pecan; Fusarium stem rot and broad mite injury on pepper; Fusarium fruit rot and bacterial soft rot on pumpkin; leaf mold on tomato; and Plectosporium blight on watermelon.
On ornamentals and turf, we have diagnosed Pythium root rot on cockscomb; Volutella blight on pachysandra; Volutella canker, Macrophoma dieback, and boxwood blight on boxwood; Botryosphaeria dieback on holly; Phytophthora root/crown rot on juniper; Phyllosticta needle blight on arborvitae; Swiss needle cast on Douglas fir; tip blight on pine; anthracnose (Monostichella) on maple; Cercospora leaf spot on persimmon; anthracnose, Actinopelte leaf spot, and bacterial leaf scorch on oak; and anthracnose and Bipolaris leaf spot on bermudagrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians