Abstract

Investigations were conducted on the interaction of temperature and photoperiod on the incidence of adult diapause in Chilocorus bipustulatus. The threshold of induction in the southern strain investigated is adapted to a shorter photophase and lower temperature than has been reported in the literature for northern strains. A 10 hr photophase at 22°C, or 14 hr photophase at 18°C, prevents diapause induction.

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