Abstract

고구마 뿌리혹선충(Meloidogyne incognita)의 시설재배 오이에 대한 경제적 피해한계를 조사하기 위하여 비닐하우스 내에 합판으로 만든 박스(<TEX>$30{\times}40{\times}15cm$</TEX>)를 묻고 박스 내 토양 <TEX>$100cm^3$</TEX>당 뿌리혹선충 유충의 밀도를 0, 10, 30, 100, 300, 600마리로 조정된 토양을 넣었다. 각 박스에는 '장수신토좌'에 접붙인 '슈퍼만촌'오이 23일 묘를 8월 1일 1포기씩 심고 11월까지 각 구당 오이 수확량을 조사하였다. 뿌리혹선충의 유충밀도와 수량과의 회귀식은 <TEX>$Y=0.82-0.04{\cdot}Log_{10}$</TEX>(Pi+1)로 방제 비용을 감안한 경제적 피해 허용 수준은 정식전 뿌리혹선충 유충의 밀도가 토양 <TEX>$1,000cm^3$</TEX>당 5마리이면 살선충제 입제 살포가 경제적이고, 유충의 밀도가 토양 <TEX>$1,000cm^3$</TEX>당 25마리 이상이면 훈증제를 처리하는 것도 고려해 볼 수 있다. 오이 시설재배시 뿌리혹선충의 피해를 방지하기 위해서는 최소한 정식 수개월 전에 미리 토양 선충 밀도를 조사해야 할 것이다. To determine the economic threshold level of Meloidogyne incognita on cucumber in greenhouse conditions, cucumber seedlings(Cucumis sativa L. cv. 'Super Manchon') grafted on 'Jangsushintozoa'(Cucurbita maxima x Cu. moschata) were planted in wooden boxes(<TEX>$30{\times}40{\times}15cm,\;L{\times}W{\times}D$</TEX>) under a plastic house in August 01 and harvested from Sep. 01-Oct. 30, 2006. The initial nematode population densities(Pi) in the wooden boxes were adjusted to 0, 10, 30, 100, 300, and 600 second-stage juveniles(J2)/100 <TEX>$cm^3$</TEX> soil. The relationship of total fruit yield to Pi level could be adequately described by a linear regression equation, <TEX>$Y=0.82-0.04{\cdot}Log_{10}$</TEX>(Pi+1). Initial nematode densities(Pi) before planting in excess of 5 J2/1,000 <TEX>$cm^3$</TEX> soil caused in total yields loss that is equivalent to the costs of granular nematicide application; Pi level in excess of 25 J2/1,000 <TEX>$cm^3$</TEX> soil caused in total yields loss that exceed the costs for application of fumigants at current control costs. We propose two different management strategies depending on nematode densities, (i) application of non-fumigant granular nematicides for M. incognita Pi level of 5 J2/1,000 <TEX>$cm^3$</TEX> soil and (ii) fumigant treatment with Pi level over 25 J2/1,000 <TEX>$cm^3$</TEX> soil. Soil samples to determine population density of Meloidogyne spp. for advisory purposes should be taken several months before planting time, which allows a period of time enough for implementing management procedures.

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