The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
During the first part of 2015, relatively few samples were submitted for diagnosis. Diplodia ear rot on corn and charcoal rot stored on sweetpotato were diagnosed. Greenhouse samples have begun to arrive over the past several weeks, including anthracnose (crown rot phase) on strawberry; tomato spotted wilt virus on tomato; Botrytis stem canker and spider mite injury on industrial hemp; Botrytis blight on petunia; Pythium root rot on Boston fern, pepperomia and petunia; and symptoms of high pH and low fertility on petunia and calibrachoa.
On ornamentals and turf, we have diagnosed Dothistroma needle blight on pine; Rhizosphaera needlecast on spruce; winter injury on boxwood and arborvitae; and pink snow mold on bentgrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians