This study was conducted to reduce the using amount of chemical fungicides for the control of red-pepper Phytophthora blight. Effect of combination application of two microbial fungicides and two chemical fungicides for the control of red-pepper Phytophthora blight was examined in vitro, in greenhouse and under field conditions. Each microbial fungicides and chemical fungicides was two-fold diluted and mixed-soil drenched. In the greenhouse pot assay, the mixed application of B. pumilus QST2808

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... and a mixture of dimethomorph + ethaboxam (De) among four mixed applications of two microbial fungicides (B. pumilus QST2808, P. polymyxa AC-1) and two chemical fungicides showed the highest control effect against Phytophthora blight. Also, control effect of mixed application of B. pumilus QST2808 and De was similar to that of single application of De (dimethomorph + ethaboxam) or Mo (mancozeb + oxadixyl). In the field test, when the microbial fungicides (B. pumilus QST2808, P. polymyxa AC-1) and the chemical fungicide(De) for the control of Phytophthora blight of red pepper were mixed-soil drenched four times at 7~10 day-intervals, the control values were in the range of 78.8% to 82.0%. On the other hand when each of the two chemical fungicides (De, Mo) were soil drenched four times at 7~10 day-intervals, the control value were 65.7% to 85.8%. Consequently, the mixed application of the microbial fungicides and chemical fungicides could be recommended as a control method for reducing the using amount of chemical fungicides. 서 론 고추(Capsicum annuum L.)는 가지과에 속하는 다년생 작 물로 우리나라에서는 중요한 조미채소이다. 또한 국내 전체 채소 중 가장 많은 재배면적과 생산량을 차지하는 작물로 중요한 환금성 작물 중 하나이다. 이런 고추를 안정적으로 생산하기 위해서는 고추 생산에 피해를 주는 병해충을 효과 적으로 방제하는 것이 매우 중요하다. 고추에 발생하는 주 요 병해로 역병(Phytophthora blight), 탄저병(anthracnose), 풋마름병(bacterial wilt), 흰가루병(Powdery mildew), 바이 러스병(Virus diseases) 등이 알려져 있으며, 이중 Phytophthora capsici에 의해 발생하는 고추 역병은 전 세계적으로 고추에 심각한 피해를 일으키는 병으로서 우리나라에서도 고추 생 산에 큰 감소요인이 되고 있다. 고추 역병은 노지에서 6월 이후 비와 함께 발생되고 장마기에 주로 전파되어 7, 8월에