Abstract
The aestivation shown by the decrease of feeding activity was induced by a long photoperiod (15L-9D) 25 and 15 days after the start of rearing of adults at 20 and 30°C, respectively. It was, however, prevented by a short photoperiod (10L-14D) at 20°C, and the female beetles laid eggs 20 days after the start of rearing. Mean amount of leaves eaten by beetles during the period of aestivation was not differentiated significantly between the both temperature conditions. When the beetles experienced the aestivation at the long-day condition were transferred to the short-day, they resumed feeding and the female beetles began to lay eggs which were not different significantly in the total number from those by the inexperienced females in aestivation.
