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Economic Injury Level of Myzus persicae (Homoptera: Aphididae) at Chinese Cabbage

배추의 생육초기에 복숭아혹진딧물의 경제적 피해수준 설정

  • Jeon, Heung-Yong (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Kang, Taek-Jun (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Kim, Hyeong-Hwan (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Yang, Chang-Yeol (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Kim, Dong-Soon (Department of Plant Resources Science, College of Agriculture & Life Sciences, Cheju National University, The Research Institute for Subtropical Agriculture and Biotechnology)
  • 전흥용 (원예특작과학원 원예특작환경과) ;
  • 강택준 (원예특작과학원 원예특작환경과) ;
  • 김형환 (원예특작과학원 원예특작환경과) ;
  • 양창열 (원예특작과학원 원예특작환경과) ;
  • 김동순 (제주대학교 생명자원과학대학 아열대농업생명과학연구소)
  • Published : 2008.12.30

Abstract

This study was conducted to estimate the economic injury level (EIL) and economic threshold (ET) of the green peach aphid, Myzus persicae, on Chinese cabbage (Brassica campestris var). The changes of biomass of Chinese cabbage and M. persicae density were investigated after introduction of M. persicae at different density (0, 2, 5, 10, 15, and 20 per plant; inoculated at 10d after planting). The densities of M. persicae largely increased from the above initial densities to 0, 92.3, 177.4, 406.9, 440.4, and 471.3 aphids per plant at 18d after the initial inoculation, respectively. The biomass of Chinese cabbage significantly decreased with increasing the initial inoculated density of M. persicae: 602.0, 264.2, 262.0, 109.3, 151.0, and 67.3 g in above plots with different initial densities, respectively. The relationship between cumulative aphid days (CAD) and yield loss (%) of Chinese cabbage was well described by a nonlinear logistic equation. Using the estimated equation, EIL of M. persicae on Chinese cabbage was estimated 25 CAD per plant based on the yield loss 13%, which take into account of an empirical gain threshold 5% and marketable rate 92% of spring Chinese cabbage. Also, ET was calculated at 80% of EIL: 20 aphids per plant. Until a more elaborate EIL-model is developed, the present result may be useful for M. persicae management at early growth stage of Chinese cabbage.

봄 배추 생육초기에 복숭아혹진딧물의 접종밀도에 따른 진딧물의 밀도 증가가 배추의 수량에 미치는 영향을 조사하여 경제적 피해수준과 요방제 수준을 설정하고자 하였다. 복숭아혹진딧물을 배추정식 후 10일에 포기당 2, 5, 10, 15 및 20마리 접종한 경우 접종 후 18일의 복숭아혹진딧물의 밀도는 각각 92.3, 177.4, 406.9, 440.4, 471.3마리로 증가하였으며, 배추의 생체중은 복숭아혹진딧물의 무처리, 2, 5, 10, 15 및 20마리 접종구에서 각각 602.0, 264.2, 262.0, 109.3, 151.0, 67.3 g으로 접종밀도가 높을수록 배추의 생체중은 현저하게 감소하였다. 복숭아혹진딧물의 발생밀도와 배추의 생체중과의 관계를 구명하기 위하여 진딧물의 누적발생일수(cumulative aphid days)와 배추 생체중과의 관계식을 구한 결과 비선형의 대수모형에 잘 적용되었다. 이 관계식에서 경험적인 수익한계(gain threshold) 5%와 봄 배추 상품율(92%)을 감안하여 복숭아혹진딧물 5마리가 5일 동안 흡즙하여 13%의 수량감소를 유발시킨 경제적 피해수준을 추정한 결과 CAD 값이 25가 되었다. 또한 요방제밀도는 경제적 피해수준의 80%가 되는 CAD 값이 20으로 추정되었다. 따라서 본 결과는 봄 배추 생육초기에 복숭아혹진딧물의 요방제 밀도 설정에 유용하게 활용될 수 있을 것으로 여겨진다.

Keywords

References

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