Abstract
Laboratory and field experiments showed that the wetting agent Aqua-Gro (AG) (polyoxyethylene ester and ether of cyclic acid and alkylated phenols) significantly reduced the adsorption of the fungicide benomyl [methyl 1-(butylcarbamoyl)-2-benzimidazole carbamate] by creeping bentgrass (Agrostis palustris Huds.). With AG, significantly less fungicide was initially adsorbed and significantly more fungicide was desorbed from the thatch layer after 20 mm of water irrigation (P = 0.05). Aqua-Gro increased movement, uptake, and biological availability of the fungicide and resulted in a higher residue level of fungicide in the grass clippings. For dollar spot disease, benomyl applied at 1 kg ha¯¹ with AG gave as good control as the recommended rate of 1.5 kg ha¯¹ without AG.
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