The most common symptom is damping-off before or after seedlings emerge. Other symptoms include wilting, brown or red-brown lesions on larger seedlings and young plant stems down to the soil line and on the tap root. Infected stems often break in the lesioned area. Roots may die from a firm, dry, brown or red-brown decay. Emerging roots and stems seem to literally rot away.
Good soil conditions that promote rapid seedling development prohibit Rhizoctonia growth, but since soil conditions aren’t easy to control, a systemic seed treatment fungicide helps protect corn, soybeans, wheat, barley and cotton.