Due to recent restrictions of ecological nature which most of pesticides are been submitted, it is necessary in wood preservation to test new products and formulation with low mamalian toxicity for substitution of the traditional products. The efficiency of five synthetic pyrethroids in comparison to the traditional organo-chlorinated pesticide chlordane was evaluated. Wood blocks impregnated with those products in different concentration were exposed to dry-wood termites one year after the treatment. Decamethrin, Cypermethrin and Fenvalerate gave the best results.

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