Effects of the Synthetic Insect Growth Regulators Methoprene and Hydroprene on Survival, Development or Reproduction of Six Species of Stored-products Insects12

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Abstract
Six species of stored-products insects were reared on diets treated with methoprene and hydroprene at 1, 5, 10, and 20 ppm. Both compounds at 20 ppm prevented emergence of pupae of Tribolium castaneum (Herbst) and substantially reduced it in T. confusum Jacquelin duVal. At 5 ppm or higher, they inhibited oviposition in both species. Larvae that failed to pupate in treated food continued to molt, and those that survived to 120 days or longer after emergence were larger than normal larvae. Methoprene at one ppm or higher prevented emergence of adults of Oryzaephilus mercator (Fauvel), and O. surinamensis (L.) in treated rolled oats or cornmeal. Hydroprene produced a similar effect in cornmeal treated at 5 ppm or higher. Both compounds caused morphogenetic malformities in flour beetles and grain beetles. None of the pupal-adult intermediates or malformed adults survived. Hydroprene at 10 and 20 ppm in wheat almost completely inhibited progeny production by Sitophilus granarius (L.). Both compounds caused decreasing productivity with increasing concentration in S. oryzae (L.) but not enough to provide useful control.

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