Abstract
A comparison was made of the production of sexual morphs by biotypes C and E of the greenbug, Schizaphis graminum (Rondani), when the aphids were raised under different photoperiodic regimes or exposed to long scotophases at different stages in their development. For male production, biotype C required fewer postnatal long-night exposures than biotype E. The threshold (minimal) scotophase for the induction of males in biotype C was 11 h, whereas biotype E required a night length between 11 h 14 min and 11 h 32 min. Ovipara production by both biotypes required a scotophase ≤ 11 h 32 min. The possible ecological significance of the results is discussed.
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