Abstract
Lethality, molting inhibitory effects, and feeding deterrence of 2 chitin synthesis inhibitors, hexaflumuron and lufenuron, were studied in a laboratory choice test using wood sawdust as feeding medium. Feeding deterrence of hexaflumuron in sawdust medium was lower than that observed in a previous study in which hexaflumuron-impregnated wooden blocks were used. The concentration threshold of hexaflumuron for feeding deterrence is high [>8,000 ppm for Coptotemes formosanus Shiraki, and >4,000 ppm for Reticulitermes flavipes (Kollar)], whereas ≈100% mortality was recorded 9 wk after exposure even at the lowest concentrations tested (125 ppm for C. formosanus and 31.3 ppm for R. flavipes ). Feeding deterrence of lufenuron was observed at lower concentration intervals (1,000-2,000 ppm and 50-100 ppm for C. formosanus and R. flavipes , respectively) than hexaflumuron, but baits treated with the nondeterrent concentrations of lufenuron caused only 50-80% mortality. even after 9 wk of exposure. The overall potential of lufenuron as a bait toxicant is less than that of hexaflumuron.
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