Violet root rot

Violet root rot is a severe fungal disease caused by the soil-borne pathogen Helicobasidium brebissonii. It affects a wide range of agricultural and horticultural plants, including sugar beet, sweet potato, apple trees, alfalfa, red clover, cocoa, and elm species.

The primary symptom of the infection is the development of a dense, purple-colored fungal mycelial mat on the surface of roots and tubers. As the fungus advances, it colonizes the host tissue, causing decay, softening, and tissue browning, which eventually leads to the death of the root system and plant wilting.

The disease thrives in environments characterized by high soil moisture, poor drainage, and slightly acidic conditions. The fungus persists in the soil for several years through sclerotia and mycelium, making it a persistent challenge for farmers in affected fields.

The economic impact of violet root rot is significant due to severe yield reductions and post-harvest losses. Infected produce is highly susceptible to decay in storage, potentially leading to the loss of entire batches of crops if conditions favor fungal spread in warehouses.

Control strategies focus primarily on prevention through integrated crop management. Key measures include long-term crop rotation avoiding susceptible species, soil liming to adjust pH levels, improving soil drainage, and the removal and destruction of infected plant debris to reduce inoculum load.

• Fodder beet
• Sweet potato
• Apple tree
• Alfalfa
• Red clover
• Cocoa
• Elm