Diseases

Tar Spot Update: First Reports

Ear and Stalk Rots May be an Issue in Corn

Plectosporium blight in many pumpkin fields

Clubroot caused by Plasmodiophora brassicae is a major disease of brassica, i.e., broccoli, cabbage, turnip, rutabaga, and radish. It can also infect weeds in the mustard family as well as some grasses.

Climate Change in the Apple Orchard: Sunburn and Blight

Pierce’s Disease—Background and Management for commercial grapes.

Tough season for blossom end rot for pepper and tomatoes.

A root disease that is most commonly associated with potato has turned up on tomato in a high tunnel last week. This disease goes by the delightful name of black dot root rot. The causal agent is Colletotrichum coccodes, which also causes anthracnose fruit rot on tomato (sunken, water-soaked, circular lesions).

Looking Back at Spring and Ahead to Harvest: Fireblight, Rust and Chemical Thinning