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How to Manage Pests

The UC Guide to Healthy Lawns

Take-all patch — Gaeumannomyces graminis var. avenae

Take-all patch in a lawn
Photo by A. H. McCain

Click on image to enlarge.




Take-all patch appears as circular or ring-shaped dead areas that range from a few inches up to 3 feet (90 cm) or more in diameter. Roots are rotted and have dark strands of mycelium visible on the surface. Large, black, globular, fungal fruiting bodies (perithecia) may be visible with the use of a hand lens.

Conditions favoring disease

Take-all patch generally occurs in the late fall and winter when temperatures are 50° to 60°F and soils are wet or moist. However, symptoms may not appear until the turf is exposed to periods of drought or heat stress. Soils light in texture, low in organic matter, or underfertilized also contribute to disease development.

Prevention and management

Improve soil drainage and fertilize at the recommended rate for your turf species. A professional soil analysis can provide you with information on amendments to add to improve the soil.

For more information on lawn diseases, refer to:
Pest Notes: Lawn Diseases: Prevention and Management

Statewide IPM Program, Agriculture and Natural Resources, University of California
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