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GrainGenes Pathology Report: Pythium Root Rot

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Pythium Root Rot
Other Name
Browning Root Rot
Host Species
Triticum aestivum
[ Show all 6 ]
Causal Organism
Pythium debaryanum
[ Show all 14 ]
Caused by numerous Pythium species that can infect wheat at almost any stage of growth. Field symptoms are similar to common root rot, but infections by Pythium is favored by wet soil conditions and usually more uniform on field basis. Infected root tips exhibit a yellowish- brown color and possess few root hairs. Severely infected roots often break when pulling up a plant, leaving a necrotic stub. Maturity of infected plants is often delayed. Wheat straw left on or near the soil surface by minimum or no-till practices favor development of Pythium root rot. Old seed stocks are more vulnerable to infection.
ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
Reference(1987) Compendium of wheat diseases.