The following plant disease highlights from the UK Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
Recent agronomic samples have included bacterial spot on alfalfa; and Pythium root rot on tobacco transplants.
On fruit and vegetable crops, we have seen common leaf spot (Mycosphaerella) on strawberry; fire blight on apple; white leaf spot (Mycosphaerella) on cabbage; Pythium root rot, timber rot, root knot nematode, and tomato spotted wilt virus on tomato.
On ornamentals and turf, we have diagnosed bacterial blight on peony; Pythium root rot on hydrangea; black root rot on holly; powdery mildew on ninebark; anthracnose on ash and maple; Seiridium canker on arborvitae; Rhizosphaera needlecast and Stigmina needle blight on spruce; and Pythium root dysfunction on annual bluegrass.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians