Abstract
This study was carried out to test the effects of temperatures between 2$0^{\circ}C$ and 3$0^{\circ}C$ on the reproduction and development of the rice water weevil, Lissorhoptrus oryzophilus. Preoviposition periods were much longer (17.2 to 51.0 days) in the overwintering adult females collected in March than those collected in May, regardless of temperature. Oviposition periods, however, were longer (16.9 to 22.0 days) in the adult females collected in May than those collected in March at the same temperatures. The longer oviposition period observed in the females collected in May were directly associated with higher fecundity. Egg periods were shortened from as temperature increased, but the hatching rate was highest (100%) at 27$^{\circ}C$. The developmental periods from egg to adult were shortened as temperature increased : from 77.9 days at 2$0^{\circ}C$ to 38.3 days at 3$0^{\circ}C$. The developmental zero point temperature (T) and the total effect temperature (K) for egg were 16.3$^{\circ}C$ and 62.1 dgree days, respectively. The T and K from egg to adult emergence were 13.9$^{\circ}C$ and 577.6 dgree days, respectively. The adult females of the first generation did not oviposit at 2$0^{\circ}C$, but did at $25^{\circ}C$ and 3$0^{\circ}C$. The intrinsic rate of natural increase (r$_{m}$) increased as temperature augmented. Net reproductive rate (Ro) per generation was highest (75.3) at $25^{\circ}C$.>.
벼물바구미의 생식과 발육에 미치는 온도의 영향을 2$0^{\circ}C$에서 3$0^{\circ}C$사이의 온도에서 수행하였다. 20, 25, 3$0^{\circ}C$에서 산란전기간은 5월에 채집한 월동성충보다 3월에 채집한 충에서 길었다. 그러나 같은 온도조건에서 산란기간은 3월에 채집한 월동성충보다 5월에 채집된 충이 길었다. (16.9일, 22.0일).산란기간이 긴 5월 채집충이 산란수도 많은 결과를 가져왔다. 난기간은 15.1일(2$0^{\circ}C$)에서 4.5일(3$0^{\circ}C$)로 온도가 높을수록 짧았고, 그리고 부화율은 27$^{\circ}C$에서(100%) 가장 높았다. 난부터 성충까지의 발육기간은 온도가 높아질수록 짧았다; 2$0^{\circ}C$에서 77.9일, 3$0^{\circ}C$에서 38.3일이었다. 난 발육영점온도(T)와 유효적산온도(K)는 각각 16.3$^{\circ}C$와 62.1일도이었다. 난에서 성충우화까지는 각각 13.9$^{\circ}C$와 577.6일도이었다. 제1세대 성충은 2$0^{\circ}C$에서 산란하지 못하였고, $25^{\circ}C$와 3$0^{\circ}C$에서는 산란하였다. 내적자연증가율(r$_{m}$ )은 온도가 높을수록 증가되었다. 1세대당 순증식율(Ro)은 $25^{\circ}C$에서 가장 높았다(75.3).
