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Rhizoctonia is most
aggressive when soybeans are under stress. There are two types of stress
involved in the prevalence of Rhizoctonia root rot. First is moisture
stress. Dry weather can weaken some soybeans, thus creating non-ideal
conditions. These plants may have been lightly infected during seedling stages.
Symptoms worsen when these plants receive excessive stress over a long period of
dry weather, especially if they are planted on a hillside. 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. 
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