Abstract
Populations of the sugarcane borer, Diatraea saccharalis (F.), in the Lower Rio Grande Valley of Texas were found to enter facultative diapause as last-stage larvae. The peak incidence of diapause in sugarcane fields occurs in Nov. or Dec. Both induction and termination of diapause are dependent upon photoperiod and temperature. A high incidence of diapause is induced when the insects experience both low temperatures and short photophase. The critical day-length for diapause induction at 21°C is between 12 and 13 h of light. Diapause termination is accelerated by increasing both temperature and photoperiods.
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