The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit and vegetables, and ornamentals.
Lepto leaf spot was diagnosed on alfalfa; Pythium root rot, Rhizoctonia damping-off, Sclerotinia collar rot, and cold injury were diagnosed on tobacco transplants.
On fruit and vegetable samples, we diagnosed common leaf spot on strawberry; Pythium root rot, root knot nematode, Botrytis stem canker, Fusarium wilt, and tobacco mosaic virus on tomato.
On ornamentals, we have seen Pythium root rot and oedema on geranium; fire blight on ornamental pear; Swiss needlecast on Douglasfir; Dothistroma needle blight and Diplodia tip blight on pine; Rhizosphaera needlecast on spruce; Phytophthora root rot on taxus; freeze injury on boxwood; and winter injury/desiccation on English ivy, nandina, arborvitae, juniper, and holly.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians