Plant Protection
Soybean Fungus Management
Soybean Rhizoctonia Root Rot

Rhizoctonia root rot is a widespread and common seedling and root-rotting disease of soybean.
Damage prior to emergence is common but difficult to identify.
In seedlings and older plants, a reddish-brown sunken lesion is a characteristic symptom of Rhizoctonia infection.
Fusarium solani, which causes seedling rot, is commonly associated with Rhizoctonia infections. It is not possible to identify dual infections in the field.
The infections can be superficial and cause no noticeable damage to plants, or they can girdle the stem and kill or stunt plants.
Seedlings or older plants may be stunted and may wilt from a firm, dry, brown to reddish brown decay or sunken lesion on the root and stem below or near the soil line.

Pathogen Involved:
Rhizoctonia solani (a soilborne fungus).
It has a wide host range that may include corn, alfalfa, and soybean.

Time of Occurrence:
Primarily in early to mid summer, but can occur all season.

Conditions Favoring Disease:
High soil moisture - but not saturated. Warm soil temperatures. Herbicide injury.
Soil types with high amounts of organic matter. Delayed emergence.

Disease Management:
Crop rotation and some seed treatments can reduce damping-off and root rot.
Tillage may be of value where disease was severe.
Encourage seedling health with good agronomic practices and avoid herbicide stress.

From: Field Crop Diseases.Information and Management for Illinois

Fungicide Control:

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