Penetration, Metabolism, and Elimination of Amitraz and N'-(2,4-Dimethylphenyl)-N-methylformamidine in Southwestern Corn Borer Larvae (Lepidoptera: Pyralidae)1

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Abstract
Penetration, metabolism, and elimination of amitraz and its toxic metabolite N'-(2,4-dimethylphenyl)-N-methylformamidine (BTS-27271) were examined in larvae of Diatraea grandiosella (Dyar). Penetration and elimination were faster with BTS-27271 than with amitraz; the reverse relationship existed with regard to metabolism. The major oreganosoluble amitraz metabolite was BTS-27271, whereas the major BTS-27271 metabolites were 2,4-dimethylformanilide and 2,4-dimethylaniline. In addition to 2,4-dimethylformanilide and 2,4-dimethylaniline, other metabolites common to both formamidines included 4-formamino-3-methylbenzoic acid, 4-amino-3-methylbenzoic acid, and 2-amino-5-methylbenzoic acid.

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