TAKE-ALL ROOT ROT

Gaeumannomyces graminis

TAKE-ALL ROOT ROT IN THE TURF

Primarily, St. Augustine, Bermudagrass, and Centipedegrass are susceptible to Take-all root rot.  The fungus causes wilted, circular patches that are brown or bronze-colored and can measure up to several feet in diameter.

Take-all root rot typically occurs in wet conditions and in areas with high soil pH.  It is most severe at a pH of 6.5 or above.  Less fertile and sandy soils also favor this disease.

Roots are short and rotted. Infected plants have dark brown roots, and if examined under a microscope, strands of darkly pigmented runner hyphae (fine tubular threads of fungus mycelium) can be seen on roots, stolons and rhizomes.

The following measures will help control this fungus:

·           Use acidifying fertilizers (ammonium sources of nitrogen)

·           Apply moderate to high levels of phosphorous, potash and minor elements where these nutrients are depleted from the soil.  A soil test will provide an accurate analysis of soil condition and nutrient recommendations.

·           Improve the drainage of the turf.

·           Reduce thatch.

·           Apply fungicides in fall, prior to dormancy, and early spring.

·           Avoid excessive irrigation and nitrogen fertilizers.

·           Aerate soil.