Plant Diseases Management

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).

Tough season for blossom end rot for pepper and tomatoes.

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

Climate Change in the Apple Orchard: Sunburn and Blight

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.

Tar Spot Update: First Reports

Ear and Stalk Rots May be an Issue in Corn

Selected Fungicides and Bactericides Labeled for Greenhouse Use NOTE: Some states define pesticide applications in high tunnels as greenhouse applications, others define them as field applications. Check with your extension educator or state department of agriculture for correct application. If any information in this table is inconsistent with the label, follow the label.

Physiological Tomato Fruit Disorders

I know this seems very obvious to most growers as we have sunscald every year in our vegetable plantings. This year just seems to be especially bad as I have gotten several calls from growers about a strange problem in their peppers that looks like sunscald, but couldn’t be. The reason given that it could not be sunscald is because the plants have thick foliage and the fruit seem well covered.