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The relationship between population density jh and jhe activity in larvae of indian meal moth plodia interpunctella hubner



The relationship between population density jh and jhe activity in larvae of indian meal moth plodia interpunctella hubner



Korean Journal of Entomology 22(2): 91-99



The fresh weight, the juvenile hormone (JH) titer and the juvenile hormone esterase (JHE) activities of homogenates of the indian meal moth, Plodia interpunctella were measured at different developmental stages and population densities. Juvenile hormone esterase levels were monitored using JH I as a substrate while juvenile hormone titer was measured by Galleria bioassay. The highest weight of all individual groups demonstrated at the late 5th instar larvae and 10 individual group (24.92 mg) is higher than 100 or 500 individual group (17.96 mg, 14.68 mg). The juvenile hormone titer of 10 individual group (4th instar larvae: 24,900 GU/g) showed higher value than 100 or 500 individual group (3rd instar larvae: 18,200 GU/g, 15,400 GU/g). Also, two major peaks of juvenile hormone esterase were observed. The first peak occurred at prepupa and the second at pupa 4 days in all groups. The relationship between JH and JHE activity was shown to be inversely proportional. In conclusion, JH and JHE activity of low population density showed higher level than that of high population density.

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