Black Root Rot of pansy

Disease Information

Black Root Rot

 Symptoms and damage

This disease is caused by the fungal organism, Thielaviopsisbasicola, which can affect a wide range of ornamental plants. Older plants affected by the disease turn yellow and have small crinkled leaves. Close observation reveals a black discoloration moving up from the tips of the roots. Diagnosis may be difficult without professional help.


Remove and discard any infected plants. Provide good drainage to plants and avoid overwatering. The disease can be suppressed, but not cured, with regular applications of fungicides containing thiophanate-methyl.


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