Biology and mass rearing technique of earwigs, Euborellia spp. as predators of Asian corn borer, Ostrinia furnacalis (Guenee) [Philippines]
1987
Javier, P.A. | Dayaoen, C.L. | Rejesus, B.M.
The biology and mass rearing technique for two earwig species, Euborellia (Euborellia) annulata (F.) and E. (E.) philippinensis Srivastava, predatory to Asian corn borer (ACB), Ostrinia furnacalis (Guenee) were determined in the laboratory. Larvae and pupae of red flour beetle (RFB), Tribolium castaneum (Herbst) were used as unnatural host. Both species underwent four nymphal instars with a total developmental period of 36.5 plus or minus 0.25 days for E.(E.) annulata and 39.5 plus or minus 0.29 days for E. (E.) philippinensis. Egg incubation period for the former species lasts for 7 plus or minus 0.88 days and 6 plus or minus 1.02 days for the latter. Both lay a total of 6 egg batches throughout their ovipositional period. E. (E.) annulata lays a mean total of 240 plus or minus 0.14 eggs and 264.5 plus or minus 0.14 for E. (E.) philippinensis. Earwigs were mass reared in the laboratory using 2:1 (by volume) soil-sand mixture as substitute for oviposition and shelter. Larvae and pupae of RFB were used as food RFB was cheaply mass produced in 19:1 (by weight) rice bran-yeast mixture. Two natural enemies of the earwigs encountered in the laboratory were fungal pathogens and predatory mites.
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