호박 흰가루병, 역병, 푸자리움시들음병에 대한 저항성 품종 선발 및 호박흰가루병 방제를 위한 난황유플러스와 pH교정황토유황합제의 효과 검정

This study was conducted to investigate treatments of cooking oil and egg yolk plus(COY plus) and pH adjusted loess sulfur mixture(PLS) to control effectively powdery mildew in organic squash cultivation. Using 50 varieties including root stock, pumpkin, and squash, the degree of disease resistance to powdery mildew, Phytophthora rot and Fusarium wilt disease was evaluated. Most of the varieties were susceptible to powdery mildew. Eight fusarium resistant varieties showed resistance to Fusarium wilt. Most of them were susceptible to Phytophthora rot, and only three(SP12, SP45, and SP48) varieties showed moderate resistance. The use of 0.3% COY plus or 1.0% PLS was more effective than 0.3% COY in the control of powdery mildew. In addition, 0.3% COY plus or 1.0% PLS treatment at 1-week-interval or 2-weeks-interval was the most effective in the control of powdery mildew. In addition, the combination treatment of 0.3% COY plus and 1.0% PLS at 3-weeks-interval showed a significant effect in powdery mildew control. Therefore, the use of 0.3% COY plus or 1.0% PLS is considered to be very economical because it reduces the cost of control.