Synergistic insecticidal compositions and method of improving insecticidal compositions

摘要

The efficacy of an insecticide to which insects have developed resistance is improved by admixing the primary insecticide with a compound which phosphinylates those enzymes within the insects responsible for neutralizing the insecticide. Synergistic insecticidal mixtures contain at least one primary insecticide and a synergist therefor, the synergist having the formulaX and Y are each O or S, R₁ = R₂ and is an aryl, substituted aryl, heterocyclic, or substituted heterocyclic radical, R₃ is H or an alkyl radical and R₄ is an electron acceptor from the phenyl group to facilitate cleavage of the P-Y bond and is exemplified by N0₂, Cl and NH₂.