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Reduction of reproductive potential in spruce budworm choristoneura fumiferana lepidoptera tortricidae by a chitin inhibiting insect growth regulator



Reduction of reproductive potential in spruce budworm choristoneura fumiferana lepidoptera tortricidae by a chitin inhibiting insect growth regulator



Journal of Economic Entomology 76(4): 708-710



The experimental insect growth regulator UC-62644 [an ecdysis inhibitor] fed at sublethal concentrations to 6th-instar spruce budworm. C. fumiferana (Clemens), caused a dose-dependent reduction in reproductive potential of emerging adults. At 0.01 ppm, there were no effects on mating, fecundity, or hatch. Reciprocal crosses between adults from the control and 0.025-ppm treatment demonstrated that males were more susceptible to UC-62644 than females. At this concentration, the UC-62644 reduced their capability to successfully mate with either treated or control females. The few females that were mated by males from the 0.025-ppm treatment produced normal complements of viable eggs. Higher concentrations (0.034 ppm) of UC-62644 affected both sexes. Reduction in mating success was greater in treated males, and reductions in egg production was significant only with treated females.

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Accession: 006280088

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