The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit and vegetables, and ornamentals.
Agronomic samples included wheat soilborne mosaic virus on wheat; and Rhizoctonia damping-off on tobacco transplants. On fruit, vegetable and herb samples, we diagnosed anthracnose crown rot on strawberry; Pythium root rot and root knot nematode on tomato (greenhouse production); Pythium root rot on hydroponic basil; and black root rot and fertilizer burn on thyme.
On ornamentals, we have seen Pythium root rot, black root rot, and iron deficiency on calibrachoa; iron toxicity on geranium; Rhizosphaera needlecast on spruce; and winter desiccation injury on boxwood, hemlock, azalea and holly.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians