Second, excessive stress from improper herbicide applications, mainly postemergence applications, can promote infections by this fungus. Typical symptoms resulting from this second type of stress are malformed, swollen stems with reddish brown Rhizoctonia lesions at soil lines. Rhizoctonia cannot cause malformation of stems. Unfortunately, there are no effective methods to eliminate this disease if infection has already taken place. If the disease only causes light root rot and reduces plant vigor, using cultivation to mound soil around the base of the plant can promote root growth above the diseased portion.
Soybeans can out-grow the light infections.
If you find severe Rhizoctonia root rot in one of your fields, make a note for your next soybean planting. Seed treatment not only prevents seedling blight but also promotes healthy seedlings tolerant to stress. Robust growth is very important in prevention of Rhizoctonia root rot beyond seedling stages. This information subject to a usage policy .