The following plant disease highlights from the University of Kentucky Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals.
Diseases diagnosed on agronomic crops during the past week have included barley yellow dwarf virus on orchardgrass; speckled leaf blotch, powdery mildew, barley yellow dwarf virus, and wheat streak mosaic virus on wheat; Pythium root rot on hemp; Pythium root rot (Figure 1) and target spot on tobacco transplants.
On fruit and vegetable samples, we have diagnosed anthracnose on strawberry; potyvirus on bean; Pythium root rot on cantaloupe and watermelon; Botrytis leaf blight and fruit decay, Sclerotinia blight, and Pythium root rot on tomato.
Ornamental and turf samples included Pythium root rot on gerbera and ranunculus; anthracnose on ash; spot anthracnose on dogwood; rose rosette on rose; wood decay (Irpex lacteus) on cherry; and dollar spot on bentgrass.
The UK Plant Disease Diagnostic Labs are transitioning to a new database system for tracking plant samples. As a result of this change, the electronic diagnostic reports sent to Extension agents and growers will have a different appearance. This change will take place sometime over the next week or so.
By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians