Résumé/Abstract Two carbamate pesticides namely S-ethyl-N-[(methylcarbamoyl) oxy] thioacetimidate (a) formula chim and N-phenyl-(ethylcarbamoyl) propyl carbamate (b)[C 6 H 5 NH-COO-CH (CH 3)-CO-NH (C 3 H 7)] were synthesized in the laboratory. With the help of elemental analysis, IR and NMR spectra their structures were elucidated. The biological studies showed that S-ethyl-N-[(methylcarbamoyl) oxy] thioacetimidate (a) acts as ...