Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Gain Threshold Estimation for Some Pests in Major Crops

주요 작물 몇 가지 병해충에 대한 수익역치 추정

  • Park, Hong-Hyun (Applied Entomology Division, Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Yeh, Wan-Hae (Plant pathology Division, Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Park, Hyung-Man (Applied Entomology Division, Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Rural Development Administration)
  • 박홍현 (농촌진흥청 농업과학기술원 농업생물부 농업해충과) ;
  • 예완해 (농촌진흥청 농업과학기술원 농업생물부 식물병리과) ;
  • 박형만 (농촌진흥청 농업과학기술원 농업생물부 농업해충과)
  • Published : 2007.04.30
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Abstract

This study was conducted to examine the problems that would arise in our cropping systems when introducing Gain Threshold (GT) which is an important element in determining Economic Injury Level (EIL). Cain Threshold (GT) can be defined as the amount of damage (=yield loss) to justify management, and calculated by dividing the management costs by the market crop price. GTs for some pests in rice, soybean, and greenhouse vegetable crops cultivation were estimated and also compared with those in foreign countries. GTs and percentage of yield loss equivalent to them were estimated to be 4.6-6.1kg/10a/season and 1.0-1.3% for brown planthopper, white-backed planthopper, rice water weevil, and sheath blight, whereas for rice blast in rice cultivation were 12.7kg/10a/season and 2.7%. In soybean cultivation, the values for bean bug were 6.2 kg/10a/season and 3.6%. GTs and percentage of yield loss estimated for melon thrips, whitefly, and downy mildew in cucumber cultivation were 10.0-12.6kg/10a/week, 1.4-1.7%, and the values for two spotted mite and gray mildew in strawberry cultivation were 3.1-3.5kg/10a/week, 1.3-1.5%, and the values for American leaf minor, whitefly, and gray mold in tomato were 8.4-9.7kg/10a/week, 1.7-1.9%. Overall GTs in our cropping systems were so low compared to those in foreign countries, which meant that the low GTs might yield the low EILs. Therefore, we could suggest that prior to direct introduction of GTs calculated from current cultivation systems in developing EILs it is necessary to seriously consider reasonable values of GTs or the yield loss equivalents to them.

본 연구는 경제적피해수준 설정시 병해충 방제의 경제성을 결정하는 수익역치 개념을 우리나라 농업생산환경에서 적용함에 있어서 일어날 수 있는 문제점들을 검토해 보고자 수행되었다. 수익역치는 방제를 정당화할 수 있는 손실량을 의미하며, 병해충 방제에 소요되는 비용을 농산물 가격으로 나눈 값이다. 본 연구는 우리나라의 벼, 콩, 시설 채소작물의 몇몇 병해충을 대상으로 수익역치를 계산하고, 외국 문헌들에서 보고된 값들과 비교하였다. 벼에 있어서 벼멸구, 흰등멸구, 혹명나방, 벼물바구미, 잎집무늬마름병의 GT값과 그에 상응하는 수량감소율은 4.6-6.1kg/10a/작기, 1.0-1.3%, 도열병은 12.7kg/10a, 2.7% 수준이었다. 콩의 톱다리개미허리노린재는 6.2kg/10a/작기, 3.6% 수준이었다. 시설재배 채소의 경우, 오이의 오이총채벌레, 온실가루이, 노균병은 10.0-12.6kg/10a/주, 1.4-1.7%, 딸기의 점박이응애, 잿빛곰팡이병은 3.1-3.5 kg/10a/주, 1.3-1.5%, 토마토의 아메리카잎굴파리, 온실가루이, 잿빛곰팡이는 8.4-9.7 kg/10a/주, 17-1.9% 수준이었다. 우리나라 환경에서 추정된 GT값들이 전반적으로 외국에서 보고된 값들과 비교했을 때 낮은 수준이었다. 낮은 GT값들은 EIL을 낮게 설정 되도록 한다. 따라서 EIL 설정시 현재의 재배환경에서 계산된 GT 값들을 바로 도입하기 전에, 이 값들이 합리적인가에 대해 진지하게 고려해야 한다는 것을 제안한다.

Keywords

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