Residues of carbofuran and 2,3-dihydro-3-hydroxy- 2,2-dimethylbenzofuran-7-yl methylcarbamate in the mushroom,agaricus bisporus,cultivated in casing soils treated with the insecticide

Residues of carbofuran ( 1 ) and 2,3-dihydro-3-hydroxy-2,2-dimethylbenzofuran-7-yl methylcarbamate ( 2 ) in and on mushrooms, cultivated on casing soils containing added carbofuran granular insecticide, were determined. The quantitative estimations in cleaned mushroom extracts were done on thin-layer plates using a cholinesterase inhibition method. Samples were analysed, which had been harvested at different times from cultures, to which different amounts of carbofuran were added. Residues in washed and unwashed mushroom samples were compared. Residues did not exceed 0.5 mg (carbofuran) kg^?1 and 0.25 mg (compound 2 ) kg^?1 for fresh unwashed mushrooms grown on casing soil treated with carbofuran granules 1 g (a.i.) m^?2.