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Evaluation of Acaricidal Effect Against Two-spotted Spider Mite Collected from Strawberry in Greenhouse

딸기 시설 하우스 점박이응애에 대한 살비 효과 평가

  • Kwon, D.H. (Korea National College of Agriculture and Fisheries) ;
  • Ahn, Y.K. (Korea National College of Agriculture and Fisheries) ;
  • Hong, K.H. (Korea National College of Agriculture and Fisheries)
  • 권덕호 (국립한국농수산대학 채소학과) ;
  • 안율균 (국립한국농수산대학 채소학과) ;
  • 홍규현 (국립한국농수산대학 채소학과)
  • Received : 2020.11.06
  • Accepted : 2020.12.10
  • Published : 2020.12.28

Abstract

In the strawberry cultivation areas and domestic farms, two-spotted spider mites are the most serious pests. It decreases the product yield due to the direct feeding of chlorophyll by the mites resulting in reduced photosynthetic ability of host plant. In this study, a simplified acaricidal effect evaluation system (SAEES) was employed to choose the effective acaricidal products among 10 items based on leaf-dipping bioassay methods. SAEES had the advantage of being able to screen four commercial products with three replications at the same time in the recommended concentration. The susceptible strains (SL_YS) showed a high mortality rate of about 90-100%, whereas the mortality of local strains was differed by each acaricides. It suggests that the acaricide responses of field populations might differ due to spray frequencies and acaricide product. An efficacy index (0.8-1.0) was determined based on the mortality of susceptible strain, which would allow the most effective commercial products to be selected by the range of this index. In summary, SAEES will enable the selection of effective commercial products and contribute to increasing control against T. urticae in strawberries.

딸기 재배지에서 점박이응애는 엽록소를 직접적으로 흡즙하여 생산량을 낮추는 주요 난방제 해충이다. 본 연구에서는 간이 약효 검정법을 개발하여 친환경유기농자재와 화학합성살비제가 포함된 10종의 약효를 평가하였다. 해당 기법은 4개의 약제를 3반복으로 실험할 수 있는 장점이 있어 시료 전처리 시간을 단축시킬 수 있다. 감수성 계통(SL_YS)을 포함한 전북 정읍(2020_JB_01), 충북 청주(2020_CB_01), 강원 고성(2020_GW_01)에서 채집한 지역 계통을 대상으로 약효를 평가한 결과 감수성 계통은 약 90-100% 사충률을 보인 반면에 지역 계통은 약제별로 상이하게 나타났다. 우수 약제를 선발하기 위해 약효 지수를 감수성 계통을 기준으로 산출하였다. 2020_JB_01 계통에 대한 우수 약제는 Test_02, Test_03 그리고 Test_10 약제가 선정되었다. 2020_CB_01 계통에 대해서는 Test_03과 Test_04가 선정되었다. 2020_GW_01 계통에서는 Test_01, Test_02, Test_03, Test_06 그리고 Test_10이 선정되었다. 계통 별 약제 반응이 다른 이유는 농가별 사용 약제와 살포 횟수가 다르기 때문인 것으로 사료된다. 약효 간이 검정법은 우수 약제 선발을 가능하게 하여 딸기 재배지 점박이응애 방제 효율을 증대시킬 것으로 기대된다.

Keywords

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