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Comparative effects of two chitin synthesis inhibitors, hexaflumuron and lufenuron, in a bait matrix against subterranean termites (Isoptera: Rhinotermitidae)

Su, N.Y., Scheffrahn, R.H.
Journal of economic entomology 1996 v.89 no.5 pp. 1156-1160
hexaflumuron, antifeedants, chemical control, baits, food consumption, molting, toxicity, insect control, Coptotermes formosanus, mortality, Reticulitermes flavipes
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 Coptotermes formosanus Shiraki, and >4,000 ppm for Reticulitermes flavipes (Kollar)], whereas approximately 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 hexalumuron.