A pesticidal composition comprises a mixture of a compound of the general formula: (I) FORM:1091964/A5-A6/1 in which R1, R2 and R3 each represents an alkyl radical, with a compound of the general formula: (II) FORM:1091964/A5-A6/2 in which R and R1 each represents a C2-C5 alkyl radical, which may be interrupted by an oxygen atom, or a phenyl group; R11 represents a hydrogen atom or a methyl group; Z represents an oxygen or sulphur atom; A represents a halogen atom, or an alkyl or chloralkyl radical; Hal represents a halogen atom; and n and m each equal 1 or 2, or a halogenation product of dimethyldichlorovinyl phosphate. The compositions may be in the form of powders, aqueous dispersions or pastes, or as self-dispersing oils.
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