Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Temperature-dependent Development Model and Forecasting of Adult Emergence of Overwintered Small Brown Planthopper, Laodelphax striatellus Fallen, Population

애멸구 온도 발육 모델과 월동 개체군의 성충 발생 예측

  • Park, Chang-Gyu (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science) ;
  • Park, Hong-Hyun (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science) ;
  • Kim, Kwang-Ho (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science)
  • 박창규 (국립농업과학원 농업생물부 작물보호과) ;
  • 박홍현 (국립농업과학원 농업생물부 작물보호과) ;
  • 김광호 (국립농업과학원 농업생물부 작물보호과)
  • Received : 2011.10.07
  • Accepted : 2011.12.12
  • Published : 2011.12.30
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Abstract

The developmental period of Laodelphax striatellus Fallen, a vector of rice stripe virus (RSV), was investigated at ten constant temperatures from 12.5 to $35{\pm}1^{\circ}C$ at 30 to 40% RH, and a photoperiod of 14:10 (L:D) h. Eggs developed successfully at each temperature tested and their developmental time decreased as temperature increased. Egg development was fasted at $35^{\circ}C$(5.8 days), and slowest at $12.5^{\circ}C$ (44.5 days). Nymphs could not develop to the adult stage at 32.5 or $35^{\circ}C$. The mean total developmental time of nymphal stages at 12.5, 15, 17.5, 20, 22.5, 25, 27.5 and $30^{\circ}C$ were 132.7, 55.9, 37.7, 26.9, 20.2, 15.8, 14.9 and 17.4 days, respectively. One linear model and four nonlinear models (Briere 1, Lactin 2, Logan 6 and Poikilotherm rate) were used to determine the response of developmental rate to temperature. The lower threshold temperatures of egg and total nymphal stage of L. striatellus were $10.2^{\circ}C$ and $10.7^{\circ}C$, respectively. The thermal constants (degree-days) for eggs and nymphs were 122.0 and 238.1DD, respectively. Among the four nonlinear models, the Poikilotherm rate model had the best fit for all developmental stages ($r^2$=0.98~0.99). The distribution of completion of each development stage was well described by the two-parameter Weibull function ($r^2$=0.84~0.94). The emergence rate of L. striatellus adults using DYMEX$^{(R)}$ was predicted under the assumption that the physiological age of over-wintered nymphs was 0.2 and that the Poikilotherm rate model was applied to describe temperature-dependent development. The result presented higher predictability than other conditions.

줄무늬잎마름병을 매개하는 애멸구, Laodelphax striatellus Fallen의 온도에 따른 알 및 약충 발육 기간을 12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, $35{\pm}1^{\circ}C$의 10개 항온, 14:10 (L:D) h 광, 상대습도 30~40% 조건에서 조사하였다. 알은 모든 온도 조건에서 1령으로 성공적으로 발육하였으며, 발육기간은 $12.5^{\circ}C$에서 44.5일로 가장 길었고 온도가 증가함에 따라 짧아져 $35^{\circ}C$에서 5.8일로 가장 짧았다. 약충은 12.5, 15, 17.5, 20, 22.5, 25, 27.5, $30^{\circ}C$에서 성충까지 발육 가능하였으며, 각 온도에서 약충 전체 발육기간은 132.7, 55.9, 37.7, 26.9, 20.2, 15.8, 14.9, 17.4일이 소요되었다. 온도와 발육율과의 관계를 설명하기 위해 선형 및 4개의 비선형 (Briere 1, Lactin 2, Logan 6, Poikilotherm rate) 모델을 사용하여 분석하였다. 선형 모델을 이용하여 추정한 알과 약충 전체기간 발육을 위한 발육영점온도는 각각 $10.2^{\circ}C$와 $10.7^{\circ}C$였으며 발육에 필요한 유효적산온도는 각각 122.0, 238.1DD였다. 4가지 비선형 모델 중 Poikilotherm rate 모델이 모든 발육단계에서 온도와 발육율과의 관계를 가장 잘 설명하였다 ($r^2$=0.98~0.99). 알 및 유충의 발육단계별 발육완료 분포는 two-parameter Weibull 함수를 사용하였으며 모든 발육단계에서 비교적 높은 상관관계 ($r^2$=0.84~0.94) 값을 보여 양호한 모형 적합성을 보였다. DYMEX$^{(R)}$(version 3.0)를 이용하여 2개 지역에서 애멸구 월동 개체군의 발육을 추정한 결과 월동 후 개체군의 생리적 연령을 0.2로 가정하고 온도발육 모델로 Poikilotherm rate 모델을 사용하였을 경우 높은 우화시기 예측력을 볼 수 있었다.

Keywords

References

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