Abstract
The body weight of the Henosepilachna adult increased markedly when reared on food plant foliage under short-day. It reached 140% on the 3rd day of adult life (100% at the emergence) and exceeded 150% on the 6th day. Fat body also developed after the 6th day, and filled the body cavity until the 16th day, when the beetles ceased feeding and entered diapause. Dry weight and lipid content of the adult increased markedly between the 3rd and the 6th day, and thereafter the increase became gradual. In this insect, the change of photoperiodic condition from a short-day to a long-day after the 5th day of adult life did not stimulate the ovarian development. When the adults were fed on sliced potato, the development of the fat body was delayed and the sensitivity to the photoperiodic change was maintained for a longer period of time. Under such conditions, therefore, the diapause was broken by the above-mentioned photoperiodic change even after the 5th day of adult life. It is concluded from these results that the photoperiodic sensitivity depends on the development of the fat body.
