Topdressings formulated with mixtures of sand and various composts or organic fertilizers (70:30, v/v) were applied to putting greens of creeping bentgrass and annual bluegrass and evaluated for their ability to suppress dollar spot disease development. When applied as preventive treatments at monthly intervals, topdressings amended with selected commercial organic fertilizers composed of animal and plant meals were highly suppressive to dollar spot consistently over a 3-yr period. The level of suppression in some experiments did not differ from that of the fungicide propiconazole (.)
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Eric B. Nelson (1992) studied this question.