Success of Grapholita molesta (Busck) reared on the diet used for Cydia pomonella L. (Lepidoptera: Tortricidae) sterile insect release.

Chubb, B.E., Whitehouse, C., Judd, G.J.R., and Evenden, M.L. (2012). "Success of Grapholita molesta (Busck) reared on the diet used for Cydia pomonella L. (Lepidoptera: Tortricidae) sterile insect release.", Journal of the Entomological Society of British Columbia, 109, pp. 48-54.

Abstract

The survival and development of Grapholita molesta (Busck) reared from egg to adult on the synthetic diet currently used by the Okanagan–Kootenay Sterile Insect Release Program to mass rear Cydia pomonella L., in Osoyoos, British Columbia, was compared to those of G. molesta reared on the synthetic diet normally used to rear G. molesta in the laboratory. Survival and development on a diet of crab apples were tracked as a control. The fitness of resulting moths was compared using metrics of survival to pupation and pupal weight, survival to adulthood, and female fecundity. More G. molesta reached the pupal stage and had significantly greater mass when reared on the G. molesta diet than on either the C. pomonella diet or the crab apple diet. Numbers of moths surviving to adulthood were similar for all three diet types. Although larval diet affected pupal mass of G. molesta, the resulting females produced a statistically similar number of offspring, regardless of diet. This study suggests that Grapholita molesta can be reared successfully on the diet currently used to rear C. pomonella for sterile insect release, but mass production of G. molesta will require modification, as well as a period of adaptation to this novel food source.

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