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Azinphosmethyl and Fenvalerate Runoff Loss from a Sugarcane-Insect IPM System¹

ABSTRACT

Azinphosmethyl {0,0-dimethyl S-[(4-oxo-1,2,3-benzotriazin-3(4H)-yl)methyl] phosphorodithioate} and fenvalerate [(RS)--cyano-3-phenoxybenzyl (RS)-2-(4-chlorophenyl)-3-methylbutyrate] were applied to sugarcane (Saccharum officinarum L.) runoff plots at rates of 0.84 and 0.22 kg/ha, respectively, 4 times each year in 1980 and 1981 as part of an insect integrated pest management (IPM) system research evaluation for season-long control of the primary sugarcane insect pest, the sugarcane borer [Diatraea saccharalis (F.)]. Runoff samples (water + sediment) were collected within 8 h after each storm and analyzed by gas chromatography. In 1980, runoff losses of azinphosmethyl and fenvalerate were 0.08 and 0.02%, respectively, of the amount applied. Runoff in 1981 was about twice that in 1980, partially accounting for larger insecticide runoff losses measured, 0.55 and 0.56% of that applied for azinphosmethyl and fenvalerate, respectively. The larger 1981 losses also were attributed to shorter time intervals between insecticide applications and runoff events. Azinphosmethyl concentrations in runoff do not appear to be harmful to surrounding aquatic habitats, whereas fenvalerate concentrations might present problems, particularly if applied at 0.22 kg/ha rates.

Key Words: Guthion® • Pydrin® • insecticide • Saccharum officinarum L. • "edge-of-field" concentrations • Diatraea saccharalis (F.) • surrounding aquatic habitats

¹ Joint contribution of USDA-ARS, and the Louisiana Agric. Exp. Stn., Baton Rouge, LA 70893.

² Research Chemist, USDA-ARS, Soil & Water Pollut. Res. Lab.; Associate Professor, Entomology Dep., Louisiana Agric. Exp. Stn.; Associate, Entomology Dep., Louisiana Agric. Exp. Stn.; and Soil Scientist, USDA-ARS, Soil & Water Pollut. Res. Lab., Baton Rouge, LA 70893, respectively.

Received for publication October 9, 1982.