The following plant disease highlights have been compiled from samples submitted to the University of Kentucky Plant Disease Diagnostic Laboratories since the start of 2019.
Diagnostic samples of agronomic crops have included Sclerotinia crown and stem rot on alfalfa; Pythium root rot, Rhizoctonia stem and root rot, Fusarium root rot, and hemp russet mite infestation on hemp.
On fruit, vegetable, and herb crops, we have diagnosed winter injury on raspberry; Pythium root rot and genetic abnormalities on tomato; injury from high soluble salts on pepper and tomato; and Phytophthora root rot on lavender.
On ornamentals, we have diagnosed cold injury and phosphorus deficiency on lobelia; Florida fern caterpillar on Boston fern; anthracnose and Rhizoctonia root rot on leucanthemum; boxwood blight (Figures 1 & 2), boxwood leaf miner, and Volutella canker on boxwood; Botryosphaeria canker on dogwood; elongate hemlock scale and Phomopsis dieback on hemlock; Dothistroma needle blight on pine and spruce; and Rhizosphaera needle cast on spruce.
Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians