Abstract
Experiments were done to discover the effects of the synthetic juvenile hormone (SJH) of Law et al. (1966) on the survival and fecundity of adult apterous cabbage aphids and on the survival and form of their young. Experiments were also carried out to find the lowest dose of SJH which was morphologically active on fourth instar alatiform larvae. Doses of 0·7 to 2 μg per adult aphid reduced survival of both adults and their young, reduced fecundity, and increased the percentage of apterae developing among the young. For morphological effects 16 to 160 × 10 −3 μg/fourth instar aphid was necessary. This is a rather higher dose/unit body weight than that quoted for other insects. It is suggested that SJH is chemically related to true juvenile hormone and is acting as a less effective analogue of juvenile hormone in metabolic processes concerned in form determination.
Published Version
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