Research in Plant Disease 2010;16(1):74-80.
Published online April 30, 2010.
파프리카 흰가루병 방제용 난황유의 유화특성과 유황수화제와의 혼용 시 방제효과
이정한, 한기수, 배동원, 권영상, 김동길, 강규영, 김희규
Emulsification Characters of COY (Cooking Oil and Egg Yolk Mixture) and Mixing Application with Sulfur Wettable Powder for Enhancing the Control Efficacies against Paprika Powdery Mildew
Jung Han Lee, Ki Soo Han, Dong Won Bae, Young Sang Kwon, Dong Kil Kim, Kyu Young Kang, Hee Kyu Kim
Emulsification characters were investigated for COY (Cooking oil and Egg Yolk Mixture) and control efficacies of COY was enhanced by supplemented Sulfur wp. against paprika powdery mildews. Amount of water added to one egg yolk and 100 ml olive oil affected the homogenization of mixtures to emulsion profoundly; those premixes with 5~10 ml water were too concentrated to be homogenized, hence not dispersible in water; those with 15~20 ml water were homogenized, but tended to flocculation and not readily dispersible in water, suggesting the instability of emulsion; and those with 50 or 100 ml water were homogenized well and was readily dispersible in water to stable emulsion over long period of time. It was further confirmed that those fruits sprayed with not-fully emulsified COY revealed the oily membranes or blotches on their surfaces, whereas the ones with fully emulsified COY revealed normal clean surfaces. Treatment of COY either alone or in supplementation with Sulfur wettable powder (sulfur wp) were also effective in suppressing the recurrence of powdery mildew signs, which had disappeared in three days of foliar application. Still, the COYs supplemented with sulfur wp (COY+sulfur wp) at 1,000x or 5,000x were significantly effective in suppression against the symptom/sign recurrence over COY or sulfur wp alone.
Key Words: COY, Cooking oil and egg yolk mixture, Leveillula taurica, Powdery mildew, Sulfur WP

Editorial Office
Rm,904 (New Bldg.) The Korean Science & Technology Center 22, Teheran-ro 7-gil, Gangnam-gu, Seoul 06130, Korea
Tel: +82-2-557-9360    Fax: +82-2-557-9361    E-mail:                

Copyright © 2023 by The Korean Society of Plant Pathology.

Developed in M2PI

Close layer
prev next