Abstract
ABSTRACT. Whole body extractions from larval and adult apterous forms of Megoura viciae, and from adult Aphis fabae, were analysed for the known insect juvenile hormones (JHs) by a gas chromatography‐mass spectrometric method. Low levels of JH III were detected in both aphid species, the first identification of a juvenile hormone from an homopteran insect. Although the mean titre in adult M. viciae is higher in long‐day than in short‐day reared insects (0.12±0.03 v. 0.04±0.01 ng/g), titres were variable and measurements overlapped. The results are discussed in the context of the hormonal control of aphid polymorphism and the question of identity of homopteran and hemipteran JH.
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