Rhizoctonia Canker (Black Scurf) of Potato

Symptoms

Sunken brown cankers on underground stems, stunted or missing sprouts, and black sclerotia ("scurf") stuck to the tuber skin.

Favorable conditions

• •Cool, wet soil at planting
• •Contaminated seed potatoes or infested soil

Management

1. 1Use certified disease-free seed potatoes
2. 2Treat seed with a labeled fungicide
3. 3Rotate crops
4. 4Plant at the proper depth