Abstract: To understand the effects of temperature and photoperiod on egg diapause induction of Apolygus lucorum Meyer-Dür, the hatch rate of A. lucorum eggs laid by those rearing at 3 temperatures and 6 photoperiods were systematically investigated. The results indicated that the 1st instar larvae of A. lucorum was the sensitive stage. The daylength less than 14 h was beneficial to diapause, while the daylength more than 14 h was beneficial to growth and diapause inhabitation at three different temperatures (17℃， 20℃，and 23℃). Short daylength had a cumulative effect on diapause induction. The diapause rate decreased with the increase of temperature in the daylength from 10 h to 14 h, and temperature had no effect on diapause induction in the daylength more than 14 h. The critical photoperiods of A. lucorum were 13 h 10 min∶10 h 50 min （L∶D）， 12 h 58 min∶11 h 2 min （L∶D）and 12 h 51 min∶11 h 9 min （L∶D） at 17℃， 20℃ and 23℃， respectively. The critical daylength shortened with the increase of temperature. The results suggest that A. lucorum is a typical long-day insect, photoperiod is the main factor of diapause induction, temperature is the cofactor of diapause induction, and low temperature in autumn is beneficial to the diapause induction.

Key words: Apolygus lucorum, diapause, diapause induction, photoperiod, temperature, sensitive stage