PURPOSE:To obtain the title composition showing excellently synergistic effects, providing insecticidal effects for a long period of time, containing O,O-diethyl S-[2-(ethyl)ethyl]phosphorodithioate and benfuracarb or furathiocarb. CONSTITUTION:The titled composition containing O,O-diethyl S-[2-(ethyl) ethyl]phosphorodithioate and 2,3-dihydro-2,2-dimethyl-7-benzofuranyl N-[N-{2-(ethoxycarbonyl)ethyl}-N-isopropylaminosulfenyl]N-m-ethylcarba mate or O-n-butyl O'-(2,2-dimethyl-2,3-dihydrobenzofuran-7-yl)N,N'-dimethyl-N-,N'- thiodicarbamate in the weight ratio of 1:0.5-2. The composition is formed into dust, wettable powder, emulsion or granule by using a carrier and an auxiliary and used in the ratio of 5-10g active ingredient/a.
