Abstract
Although it is known that the production of the sexual and parthenogenetic female morphs in Megoura viciae can be controlled by the direct action of photoperiod on the parent aphid, von Dehn has recently advanced the view that there is an additional, if subsidiary, photoperiodic effect which is exerted through the medium of the plant. However, an examination of the experimental methods employed by von Dehn suggests that the evidence for the indirect action of photoperiod may be far from conclusive. In particular, it is pointed out that no account has been taken of the very early (prenatal) onset of photoperiodic sensitivity in this insect. Very slight differences in the day-length régime during this period of ontogeny greatly influence the response pattern.
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