Photoperiodic Induction and Seasonal Incidence of Embryonic Diapause in the Cotton Fleahopper, Pseudatomoscelis seriatus1,2

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Abstract
Diapausing cotton fleahopper, Pseudatomoscelis seriatus (Reuter) (Miridae), eggs are deposited in September, before the advent of adverse winter weather. Diapause is not immediately terminated in most eggs by a return to favorable conditions. About 50 percent of field collected eggs seem to be in an intense diapause and must receive chilling temperatures below 10°C before reactivation. The remaining 50 percent are in a less intense diapause. Low intensity diapause was induced by exposure of the parental generation to test photophases of 12 h or less. Inductive photoperiods must be experienced by the parental generation earlier than the 3rd instar. When placed in a drop of water, diapausing eggs remain opaque and yellowish. Non-diapausing eggs become clear and the embryo usually can be distinguished.

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