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Rhizoctonia root rot


© Iowa State University

Pathogen(s) causing disease:

Rhizoctonia solani

Symptoms:

Produces a sunken, reddish-brown to dark brown decay of the outer layer of the main root and stem at the soil line and below. In contrast with Pythium root rot, Rhizoctonia-infected stems remain firm and dry. Phytophthora-infected roots are a dull, dark brown; those infected with Rhizoctonia are usually reddish brown.

Conditions:

Rainfall followed by cool and then warm, humid weather is most favorable for disease development. Growth of the Rhizoctonia fungus in soil depends on nutrient supply; soil moisture, temperature and pH; and competition from other soil microorganisms. Stress conditions - soil compaction, planting too deep, chemical damage.

Management:

Use a fungicide seed treatment. Promote good soil conditions that favor rapid seedling development. Avoid herbicide or other chemical damage. Avoid planting too deeply and compacting soil.

Sources:

U of IL
ISU
Purdue

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