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Precocene ii induced alate production in isolated and crowded alate and apterous virginoparae of the aphid macrosiphum euphorbiae



Precocene ii induced alate production in isolated and crowded alate and apterous virginoparae of the aphid macrosiphum euphorbiae



Journal of Insect Physiology 29(6): 477-484



Precocene II was applied at doses ranging from 0.05-0.70 .mu.g/individual to newly molted adult alate and apterous virginoparae of M. euphorbiae kept isolated or in groups of 10/plant, under an 18L:6D photoperiodic [L = light, D = dark] regime. While isolated controls of both morphs produced exclusively apterous progeny, alatae virginoparae were produced in generally dose-dependent proportions by precocene-treated individuals. Grouped controls of both morphs produced alatiform progeny as expected, but in precocene-treated groups, the proportions of alate progeny generally increased as a function of dose. The overall proportions of alate offspring produced, and numbers of days after treatment when morph production was affected, were generally greater for alatae than for apterae, indicating a greater sensitivity to precocene in alatae. During the 1st few days after treatment, the alatizing effect of precocene was stronger for apterae, suggesting that the 1st embryos produced by alatae were irreversibly determined as apterae. In an experiment where isolated alatae and apterae received 0.5 .mu.g of precocene II at different ages ranging from 1-13 days after the adult molt, the alatizing effect of the compound, measured by the persistence of alate production, varied with age and morph. While in alatae, the persistence decreased more or less regularly with age, in apterae it initially increased to a maximum in the middle of reproductive life, and subsequently decreased. Juvenile hormone is probably involved in regulating alary dimorphism in M. euphorbiae.

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Accession: 006162279

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