Wood preservative properties of chlorpyrifos

Chlorpyrifos (O,O-diethyl[3,5,6-trichloro-2-pyridyl]phosphorothioate) (CPF) was evaluated as a wood preservative insecticide in two long-term field tests. In the first project, pine sapwood blocks treated with CPF were exposed to Coptotermes formosanus using an aboveground test format. CPF is effective in protecting wood from attack by this termite, but its activity appears to decrease with time, possibly because of fungal degradation of the insecticide, which leads to subsequent insect attack. In the second project with ground contact field stakes, stakes treated with CPF plus chlorothalonil or diiodomethyl-p-tolylsulfone showed good complementary performance between the two biocides. Long-term decay and termite ratings with these formulations show clearly superior performance compared to the biocides by themselves. CPF had a negative effect on the preservative properties of didecyldimethylammoniumbromide. Combination with this fungicide resulted in lower decay and termite ratings. The addition of an insecticide like chlorpyrifos can enhance the performance of preservatives that are primarily fungicides, but care must be taken to ensure compatibility between all components in the formulation.

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