Plant Disease Diagnostic Lab Highlights

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 tan spot and leaf rust on barley; cereal yellow dwarf virus on oat; Septoria leaf blotch, stripe rust, barley yellow dwarf virus, and wheat streak mosaic virus on wheat; Botrytis gray mold, Pythium root rot, Sclerotinia collar rot (Figure 1), and spiral root problems on tobacco transplants.

Figure 1. Sclerotinia collar rot on tobacco transplants. Note the formation of sclerotia on diseased tissue; they appear white here but will become black and hardened when fully developed. (Photo: Kenny Seebold, UK)

Figure 1. Sclerotinia collar rot on tobacco transplants. Note the formation of sclerotia on diseased tissue; they appear white here but will become black and hardened when fully developed. (Photo: Kenny Seebold, UK)

On fruit and vegetable samples, we have diagnosed Phomopsis leaf blight on strawberry; cane borer on blackberry; white leaf spot on collard; Pythium root rot on pepper; Botrytis leaf blight and fruit decay, tobacco mosaic virus, and Pythium root rot on tomato.

Ornamental samples included Volutella canker and Pythium root rot on boxwood; white peach scale on cherry; and black knot on plum.

 

By Julie Beale and Brenda Kennedy, Plant Disease Diagnosticians

 

 

Posted in Plant Disease Diagnostic Lab