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Quantifying Disease Suppression Activity of Organic Fertilizers / Biostimulants on Golf Course Turfgrass in the Capital District of New York State 1999

Project Leader: David Chinery


1. Quantify any suppression capabilities of five organic-based biostimulants for fungal infections on golf course turfgrass.

2. Evaluate turfgrass quality differences among five organic-based biostimulants.


It is difficult to draw strong conclusions about the efficacy of the products examined in this study, since the data show no statistically significant differences among the treatments for either the number of dollar spots or the percentage of turfgrass damaged. Since Daconil is a fungicide that is widely known to be quite effective in suppressing turfgrass pathogens, it is surprising that the Daconil treatments did not have significantly less disease (statistically) than some of the other treatments, especially the untreated check plots.

Although the differences were not statistically significant, there were differences among the treatments when the raw data were examined. Roots Experimental T, Roots 1-2-3 plus Standup, and Roots Experimental B appear to have some ability to suppress dollar spot, while the Bio F, Roots Experimental B, and Bio B treatments showed less damage by other turfgrass pathogens. These differences were also apparent when the plots were examined visually.

These trends in the data indicate that there may be some pathogen suppression occurring with some of the treatments, although the level of suppression remains unclear. Differences among the treatments may have been clearer if overall pathogen development had been stronger. The 1998 growing season was good for turfgrass but not generally favorable to disease development.