Corallomycetella rot

Corallomycetella rot, caused by the fungal pathogen Corallomycetella repens, is a destructive disease affecting various horticultural and agricultural species. As a soil-borne pathogen, it primarily invades the root system and the crown of the plant, compromising the integrity of the vascular system and preventing essential nutrient uptake.

This pathogen is particularly problematic for dense plantings and nursery environments where moisture levels are consistently high. Affected crops often show a general decline in vigor, which is frequently misdiagnosed in the early stages as drought stress or nutrient deficiency, delaying the implementation of necessary phytosanitary measures.

Typical symptoms include progressive wilting, foliage discoloration, and the appearance of characteristic coral-red fungal stromata on the bark near the soil line. As the infection progresses, the tissues become necrotic and soft. The presence of these bright-colored fruiting bodies, especially during humid weather, is a key indicator of Corallomycetella repens activity.

The development of this disease is heavily influenced by environmental conditions, such as poor soil drainage, excessive irrigation, and low light intensity. The fungus survives in infested soil and decaying plant debris, spreading through splashing rain, contaminated irrigation water, and the use of unsterilized tools during cultivation or pruning.

Integrated management is essential for controlling this rot. Preventive strategies include the use of disease-free certified plant material, improving soil aeration, and maintaining proper plant spacing to ensure airflow. If an outbreak occurs, affected plants should be removed immediately, and the remaining area should be treated with appropriate fungicides. Ongoing monitoring of soil health is crucial to minimize the long-term impact of this pathogen.