흰등멸구, Sogatella furcifera (Horvath), 의 온도에 따른 알 및 약충 발육 기간을 $12.5{sim}5{pm}1^{circ}C$범위에서 $2.5^{circ}C$ 간격으로 10개 항온, 14:10(L:D) h 광, 상대습도 20~30% 조건에서 조사하였다. 알은 $12.5^{circ}C$를 제외한 모든 온도 조건에서 1령으로 성공적으로 발육하였으며, $1.5^{circ}C$에서 22.5일로 가장 길었고, $32.5^{circ}C$에서 5.5일로 가장 짧았다. 약충은 $15{sim}32.5^{circ}C$ 온도범위에서 성충까지 발육 가능하였으며, 약충 전체 발육기간은 $15^{circ}C$에서 51.9일로 가장 길었으며 온도가 증가함에 따라 짧아져 $32.5^{circ}C$에서 9.0일로 가장 짧았다. 온도와 발육률과의 관계를 설명하기 위해 선형 및 7개의 비선형(Analytis, Briere 1, 2, Lactin 2, Logan 6, Performance, Modified Sharpe and DeMichele) 모델을 사용하여 분석하였다. 선형 모델을 이용하여 추정한 알과 약충 전기간 발육을 위한 발육영점온도는 각각 $10.2^{circ}C$와 $12.3^{circ}C$였으며 발육에 필요한 유효적산온도는 각각 122.0, 156.3 DD였다. 7가지 비선형 모델 중 Briere 1 모델이 모든 발육단계에서 온도와 발육률과의 관계를 가장 잘 설명하였다($r^2$= 0.88~0.99). 알 및 유충의 발육단계별 발육완료 분포는 사용된 3가지 비선형(2-parameter, 3-parameter Weibull, Logistic) 모델 모두 2령과 5령을 제외한 발육단계에서는 비교적 높은 $r^2$(0.91~0.96) 값을 보여 양호한 모형 적합성을 보였다.
The developmental times of the immature stages of Sogatella furcifera (Horvath) were investigated at ten constant temperatures (12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, $35{pm}1^{circ}C$), 20~30% RH, and a photoperiod of 14:10 (L:D) h. Eggs were successfully developed on each tested temperature regimes except $12.5^{circ}C$ and its developmental time was longest at $15^{circ}C$ (22.5 days) and shortest at $32.5^{circ}C$ (5.5 days). Nymphs successfully developed to the adult stage from $15^{circ}C$ to $32.5^{circ}C$ temperature regimes. Developmental time was longest at $15^{circ}C$ (51.9 days) and it was decreased with increasing temperature up to $32.5^{circ}C$ (9.0 days). The relationships between developmental rate and temperature were fitted by a linear model and seven nonlinear models (Analytis, Briere 1, 2, Lactin 2, Logan 6, Performance and modified Sharpe & DeMichele). The lower threshold temperature of egg and total nymphal stage was $10.2^{circ}C$ and $12.3^{circ}C$ respectively. The thermal constant required to complete egg and nymphal stage were 122.0 and 156.3 DD, respectively. The Briere 1 model was best fitted ($r^2$= 0.88~0.99) for all developmental stages, among seven nonlinear models. The distribution of completion of each development stage was well described by three non-linear models (2-parameter, 3-parameter Weibull and Logistic) ($r^2$= 0.91~0.96) except second and fifth instar.
