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 diagnostic samples of agronomic crops have included zinc and magnesium deficiencies, seedcorn maggot injury and hail damage on corn; leaf streak on orchardgrass; powdery mildew, take-all and bacterial mosaic on wheat; Pythium root rot and target spot on tobacco.
On fruit and vegetable crops, we have diagnosed Botryosphaeria canker on grape; plum curculio injury on peach; cedar-apple rust, fire blight and Botryosphaeria canker on apple; phylloxera on pecan; Fusarium crown rot on asparagus; Pythium root rot and bacterial leaf spot on pepper; early blight and timber rot on tomato.
On landscape samples, we have seen anthracnose on liriope; Volutella canker/dieback on boxwood; Coniothyrium canker, powdery mildew, black spot, rose rosette disease and sawfly injury on rose; Cercospora leaf spot on crape myrtle; cottony camellia scale on holly; spot anthracnose on dogwood; Verticillium wilt on maple; anthracnose on oak; Rhizosphaera needle cast, Dothistroma and Stigmina needle blights on spruce.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians