Take-All Patch

Gaeumannomyces graminis var. avenae

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  • Take-all patch is a disease caused by the fungus Gaeumannomyces graminis. Newly seeded sites tend to be most vulnerable to this fungus, especially where bentgrass is being established on soil with a high pH. Cool-season turfgrasses, such as bentgrass, are highly susceptible. Symptoms of take-all patch are most likely to appear in late spring as small, sunken, water-soaked patches of turfgrass. Where turfgrass is stressed, the affected grass may initially appear reddish brown before dying and turning a dull brown color. The roots and crown of infected plants become dark brown to black. Small circular areas of dull brown grass continue to expand throughout the growing season, spreading in size up to about 1 meter in diameter. Symptoms begin to show up as the weather becomes warmer and drier.


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