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Persistence of deltamethrin and its isomers on pasture forage and litter

Persistence of deltamethrin and its isomers on pasture forage and litter

Journal of Agricultural & Food Chemistry 35(3): 373-378

The deposition, persistence, and isomeric conversion of deltamethrin [(S)-.alpha.-cyano-3-phenoxybenzyl (1R,3R)-cis-2,2-dimethyl-3-(2,2-dibromovinyl)cyclopropanecarboxylate] were measured after a 7.2 g/ha aerial application to control grasshoppers in two pastures. Mean deposition was 75.9% of applied, with initial deltamethrin residues of 2.06 ppmd (d = dry-weight basis) on the forage and 146 .mu.g/m2 on the litter. Deltamethrin dissipation was biphasic, and a two-compartment model was fitted to the residue data. The DT50 was 5.9 days for deltamethrin residues on forage and 17 days on litter. Small amounts of the .alpha.R diastereomer of deltamethrin were detected on the forage (0.06 ppmd) and on the litter (0.65 .mu.g/m2). The concentration of the trans isomers increased exponentially until, within 14 days after application, asymptotic levels of 0.26 ppmd on the forage and 22.7 .mu.g/m2 on the litter were reached.

Accession: 001653039

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DOI: 10.1021/jf00075a023

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