Abstract
In the middle of May, 1983, 228 overwintered adults of the brown-winged green bug, Plautia stali SCOTT were collected from a mulberry field, and were reared in containers in an insect chamber at 22±1°C and under a 16L-8D photoperiod regime. In each rearing container two females and two males were supplied with several raw peanuts and water. Rapid decrease in the survival rate of males and females was observed 50 days after the start of the rearing. Mean survival duration of males and females was 85.9±34.8SD and 90.6±31.5SD days, respectively. The average number of eggs and egg masses deposited by a female was estimated to be 461.6 and 36.4, respectively. The daily number of eggs deposited by a female increased during the first 20 days and fluctuated within the range of 6.5±0.7SD eggs during the next 50 days, then it decreased subsequently. The net reproductive rate (R0) was estimated at 231.7. Although the mean size of the egg masses was 12.7±4.9SD, egg mass size of 14 was maximum in frequency. Therefore, it is concluded that the typical size of the egg mass was fourteen in this species. The mean size of the egg mass slightly decreased with the adult age. The frequency of egg masses deposited on different sites in a rearing container also varied with the adult age. Although most of the egg masses were deposited on two-folded papers and on the surface of the rearing container, the frequency on the former increased and it decreased on the latter as the adult became older. The oviposition mostly took place during the time between 3hr before and 1hr after the beginning of the dark period.
