Fate of Carbendazim Fungicide in Bulb Mite (Acari: Acaridae)

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The fate of carbendazim fungicide was examined in bulb mites, Rhizoglyphus echniopus (Fumouze and Robin), at various intervals after exposure to 4.75 /lg per vial or 19.0/lg per vial for 1 h and after continuous exposure to 19.0 Ilg per vial for various intervals up to 96 h. Amounts of radiocarbon transferred from the vials to the mites were 13.0 /lg/g in the 4.75 /lg per vial for 1 h; 25.8 Ilg/g in the 19.0 /lg per vial for 1 h; and >60.1/lg/g in the 19.0 /lg per vial for continuous-exposure treatments. Internal (internal mite extract plus mite residue) carbendazim-14C-equivalents (ng/50 mg mites) reached apparent peak levels of 102 at 48 h in the 4.75 /lg per vial for 1 h, 314 at 72 h in the 19.0 /lg per vial for 1 h, and 751 at 96 h in the 19.0 /lg/vial for continuous-exposure treatments. The major carbendazim metabolite identified was 5-hydroxy-2-aminobenzimidazole. Low levels of 2-aminobenzimidazole and 5-hydroxy-2-benzimidazolecarbamate were present also. Appreciable amounts of nonparent radiocarbon were present in holding vial and external mite rinses, suggesting that carbendazim-•4C-equivalents also were excreted. Different doses and exposure regimens affected quantitative aspects of carbendazim fate, but no qualitative differences were evident. The processes of carbendazim penetration, metabolism, and excretion in bulb mites proceeded at substantial rates and thus were similar to those reported previously for some acaricides in this mite species.

Document Type: Research Article

Publication date: June 1, 1990

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