Efficacy of chlorothalonil and chlorothalonil plus chlorpyrifos against termite attack

Results of a laboratory bioassay on the efficacy of two preservative formulations (chlorothalonil in oil; chlorothalonil plus chlorpyrifos in oil) to the Australian subterranean termite Mastotermes darwiniensis Froggatt are given. Specimens of Pinus radiata D. Don sapwood were treated to three retentions of each formulation to achieve 3.2, 6.4, and 12.8 kg/m3 of chlorothalonil a.i. (active ingredient) and 3.2 0.2, 6.4 0.4, and 12.8 0.8 kg/m3 of chlorothalonil plus chlorpyrifos a.i. All specimens (including controls) were subjected to an artificial leaching/volatilization weathering schedule prior to the bioassay. Results showed that all three retentions of each formulation were successful in protecting specimens from significant attack by M. darwiniensis. The results also indicated that the chlorothalonil in oil formulation appeared to have an antifeedant effect on M darwiniensis.

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