Southern Blight (Sclerotium Root Rot): Identification and Management

This soil-borne fungal disease thrives in warm, wet conditions of the Southeast, sometimes called mustard seed fungus for its small yellow resting bodies. It infects many vegetables, flowers, some shrubs, and occasionally lawns. White, cottony growth appears on stems near soil level, spreading to surrounding soil. As the fungus blocks water flow, the plant rots at the base, turns yellow, and dies.

Control Strategies

Control is difficult because the fungus survives years without a host. Soil solarization helps; long (4-year) crop rotation is crucial. Avoid cultivating between plants after planting to minimize spread. In fall, clean up all debris and destroy infected plants, including root balls. Till soil in winter to bury resting bodies.

For chemical control on ornamentals, consult your Cooperative Extension Office. There is no chemical control for edible plants.