Research in Plant Disease 2009;15(1):23-29.
Published online April 30, 2009.
난황유를 이용한 가지과 작물의 흰가루병 방제
권진혁, 심창기, 지형진, 박창석
Control of Powdery Mildew on Solanaceous Crops by Using COY (Cooking Oil and Yolk Mixture) in the Greenhouse
Jin Hyeuk Kwon, Chang Ki Shim, Hyeong Jin Jee, Chang Seuk Park
Cooking oil and yolk mixture (COY), a environmentally acceptable plant protection agent, and COY+ CaCO3+neem oil mixture were studied to control the powdery mildew occurring on eggplant, paprika, cherry tomato and maturity tomato in glass houses and vinyl houses during 2005 to 2007. The morphological changes of the pathogenic fungi on the leaf surface before and after treatment of COY were observed. COY made of rape seed oil and COY+CaCO3+neem oil mixture were sprayed three times with 5 days interval to foliar parts of eggplant, paprika and tomato and the disease development were examined 5 days after final spray. In eggplant, the control efficacy of COY to powdery mildew was 94.6%. In paprika, the control efficacy of COY to powdery mildew was 91.6% and that of COY+CaCO3+neem oil mixture was 96.2% that revealed little higher than COY itself. In tomatoes(cherry or maturity tomato), the control efficacy of COY were about 91%, however, when COY mixture were sprayed to tomato leaves and stems the powdery mildew was controlled completely. Typical and healthy mycelia, conidiophores and condia were observed through scanning electron microscope in COY unsprayed leaf surface, on the other hand destroyed and winkled mycelia and conidiophores were observed in COY treated leaves regardless host plants nor taxonomic differences of fungi.
Key Words: Cooking oil and yolk mixture, COY, Powdery mildew, Solanaceous crops

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