| 摘要 |
The present invention relates to insecticidal compositions of low toxicity to fishes and mammals characterized by containing m-(p-bromophenoxy)- alpha -cyanolbenzyl trans- or trans-rich-2,2-dimethyl-3-(2,2-dichlorovinyl)cyclopropanecarboxylate of the formula (I), <IMAGE> (I) and at least one of the organo-phosphoric esters of the formula (II), <IMAGE> (II) wherein R1 and R2 are each a C1-C3 alkyl group, X1, X2 and X3 are each an oxygen or sulfur atom, Y1 and Y2, which may be the same or different, are each a C1-C3 lower alkyl, methylmercapto, cyano or nitro group or a halogen atom, Z is a carbon or nitrogen atom and n is 0 or 1, in a ratio of 1 to 1-100 (part by weight) of the former to the latter, and insecticides obtained by mixing said compositions with a carrier or a diluent and if necessary an additive. The term "trans-rich" shows the ratio of trans/cis is not less than 75/25.
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