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Root Rot (Thielaviopsis)

Root Rot (Thielaviopsis)
Root Rot (Thielaviopsis)

Thielaviopsis root and stem rot, often called Black rot, is caused by Thielaviopsis basicola. Practice good sanitation beginning with clean growing media, pots, flats and plant material. Avoid overwatering and overfertilizing. Thielaviopsis is favored by alkaline pH and can be managed by keeping the pH of the media at 5.5. Fungicide applications will not cure infected plants, but will prevent infection of healthy plants. Discard infected plants and remove plant debris and infested soil. See the current greenhouse recommendation guide for information on fungicides.