Organo phosphorus - compounds, processes for their preparation and insecticidal, acaricidal and nematocidal

摘要

An insecticidal, acaricidal or nematocidal composition which comprises an organophosphorus compound represented by formula (I): wherein R¹ , R² and R³ each represents C₁ to C₄ alkyl; A represents H, C₁ to C₄ alkyl, C₁ to C₄ alkylthio or N(R⁴)R⁵ (wherein R⁴ and R⁵ each represents H or C₁ to C₄ alkyl); Z represents C(CN)R⁶ (wherein R⁶ represents CN, C₁ to C₃ alkylsulfonyl, C₁ to C₃ alkylsulfonyl substituted with halogen, C₁ to C₃ alkylcarbonyl, C₁ to C₃ alkylcarbonyl substituted with halogen, C₁ to C₄ alkoxycarbonyl, C₁ to C₄ alkoxycarbonyl substituted with halogen, C₁ to C₄ alkylthiocarbonyl, C₁ to C₃ monoalkylaminocarbonyl or C₁ to C₃ dialkylaminocarbonyl) or N-R⁷ (wherein R⁷ represents CN, NO₂, C₁ to C₃ alkylsulfonyl, C₁ to C₃ alkylsulfonyl substituted with halogen, C₁ to C₃ alkylcarbonyl or C₁ to C₃ alkylcarbonyl substituted with halogen) and an inert carrier show excellent effect for controlling harmful insects, mites and nematodes, do not give off a bad or irritating odor and exhibit very low toxicity to warm-blooded animals.