Nearly all of the processes important for the maintenance of healthy turf take place at the microscopic level, including biological control of pathogen and insects, organic matter degradation, nitrogen fixation, and nutrient cycling and chelating. In healthy soil, beneficial microorganisms usually overcome plant pathogens, resulting in reduced damage from diseases and insects.
Certain composted materials have been shown to limit the injurious effects that some disease causing organisms can have on turf grasses. Sustane fertilizer/soil builders have been compared in various trials to both systemic fungicides and other composted materials. Shown below (and opposite page) are summaries of trial results.
Biological Suppression of Various Turfgrass Diseases with Compost-Amended Topdressings