EFFECTS OF PHOTOPERIOD AND TEMPERATURE ON INDUCTION AND TERMINATION OF REPRODUCTIVE DIAPAUSE OF THRIPS SETOSUS MOULTON (THYSANOPTERA, THRIPIDAE)

Female Thrips setosus were reared under various combinations of temper atures (23 degrees C, 18 degrees C and 5 degrees C) and photoperiods ( 15L-9D and 10L-14D) at different stages and ages. Preoviposition perio d was examined to identify the presence of reproductive diapause and t he conditions controlling induction and termination of diapause. Short -day photoperiod induced and maintained reproductive diapause, and bot h high temperature (23 degrees C) and long-day inhibited diapause indu ction and maintenance. Reproductive diapause was never terminated unde r moderate temperature (18 degrees C) and short-day, but it was termin ated under the same photothermic conditions after low temperature (5 d egrees C) incubation for a certain period.