Black root rot

Caused by: Thielaviopsis basicola
Problem Category: Fungal Disease
Symptoms: Elongated red-purple lesions on root tissue which turns dark gray to black; lesions coalesce to form large dark areas on roots and stems; deep lesions can cause stunted growth, wilting leaves, defoliation and plant death.
Comments: Fungus survive in plant debris in soil.
Management: Rotate crops with non-susceptible grasses; avoid excess irrigation or drought stress.
Control: