저항성 품종과 유기농업자재를 활용한 오이 노균병 방제

We selected eight resistant cultivars including 'Heukryongsamcheok', 'Heukgeumsolsamcheok' and 'Gangryeoksamcheok' showing high suppressive effect against cucumber downy mildew (CDM) through plastic film house and field trials in spring and autumn season in 2015. Of them, these three varieties, 'Heukryongsamcheok', 'Heukgeumsolsamcheok' and 'Gangryeoksamcheok' were used to evaluated suppressive effect against CDM by comparing disease severity (area under disease development progress curve, AUDPC) with those of three susceptible varieties under plastic film house condition. AUDPC of three resistant cultivars was in the range of 10.9 to 23.6, meanwhile those of three susceptible cultivars was in the range of 286.7 to 290.3. Consequently, we confirmed that cultivation of the selected resistant cultivars can reduce CDM in vivo. When disease severity (diseased leaf area) was investigated on a resistant cultivar ('Heukryongsamcheok') sprayed without any organic materials and susceptible cultivars sprayed single-, two times- and three times with Bordeaux mixture, sulfur-loess mixture and $Kocide^R$ (copper hydroxide), respectively, it was the lowest in the resistant cultivar plot compared to susceptible cultivar plots sprayed with any organic materials. In addition, we evaluated control effect of the selected resistant cultivar by comparing that of organic materials including lime sulfur mixture, Bordeaux mixture and garlic extract. As a result, Bordeaux mixture showed the highest control effect against CDM. AUDPC of Bordeaux mixture, resistant cultivar, lime sulfur, garlic extract and untreated control was 3.9, 10.6, 95.6, 24.9, and 258.7, respectively. Based on the above-mentioned results, we think that the resistant cultivars and Bordeaux mixture can be effectively used to control CDM as one of control measures under the farmhouse condition. 오이 노균병에 대한 저항성 품종을 선발하고자 자연발병되는 노지와 비닐하우스 내에서 봄 재배기간과 가을재배기간에 병 발생을 조사하여 모든 시험조건에서 낮은 발병을 보이는 8품종(흑룡삼척, 흑금솔삼척, 강력삼척 포함)을 저항성 품종으로 선발하였다. 저항성 정도를 평가하고자 이들 3품종(흑룡삼척, 흑금솔삼척, 강력삼척)을 선발하고 3종의 감수성 품종을 대조로 하여 비닐하우스 조건에서 발병 후 경과일수 별 병 진전 정도를 조사하여 병반하면적(Area under disease progress curve, AUDPC)을 산출한 결과, 감수성 품종에서는 286.7-290.3 범위의 높은 값을 보인 반면 저항성 품종에서는 10.9-23.6 범위의 낮은 값을 보여 감수성 품종에 비해 저항성 품종에서 병 진전이 현저히 억제됨을 확인하였다. 결과적으로 선발한 3종의 저항성 품종은 발병이 낮음을 확인하였다. 오이 저항성 품종 재배에 따른 유기농업자재 대체효과를 조사하기 위하여 비가림 시설 내에서 저항성 품종을 대비로 하여 감수성 품종을 공시하여 유기농 재배시 많이 사용되는 보르도액, 황토유황합제, 코사이드를 각각 1회, 2회, 3회 처리한 결과, 저항성 품종을 재배하는 것이 감수성 품종에 유기농업자재를 처리한 그 어떤 처리보다 노균