Control of downey mildew occurred on cucumber cultivated under plastic film house condition by optimal application of chemical and installation of ventilation fan

환기조절 및 약제적기살포에 의한 비닐하우스재배 오이에 발생하는 노균병 방제

  • Kim, Yong-Ki (Plant Pathology Division, Department of Crop Protection, NIAST, RDA) ;
  • Ryu, Jae-Dang (Plant Pathology Division, Department of Crop Protection, NIAST, RDA) ;
  • Ryu, Jae-Gee (Research Coordination Div, Research Management Bureau, RDA) ;
  • Lee, Sang-Yeob (Plant Pathology Division, Department of Crop Protection, NIAST, RDA) ;
  • Shim, Hong-Sik (Plant Pathology Division, Department of Crop Protection, NIAST, RDA)
  • 김용기 (농업과학기술원 작물보호부 식물병리과) ;
  • 류재당 (농업과학기술원 작물보호부 식물병리과) ;
  • 류재기 (농촌진흥청 연구관리국 연구운영과) ;
  • 이상엽 (농업과학기술원 작물보호부 식물병리과) ;
  • 심홍식 (농업과학기술원 작물보호부 식물병리과)
  • Published : 2003.09.30

Abstract

Survey on plant diseases occurring on cucumber cultivated in plastic film house of experimental farm in Suwon was conducted. Through the survey, occurrence of damping-off, downey mildew, powdery mildew and Fusarium wilt was observed. Especially downey mildew caused by Pseudoperonospora cubensis was the most severe foliar disease of cucumber. To control the disease effectively, effects of installation of ventilation fan and optimal spray timing of a chemical, dimethomorph+copper oxychloride WP, were investigated. Two ventilation fans installed at the front and at the back of plastic film house reduced air relative humidity by about 6.4% and downey mildew incidence by 55.7%. Downey mildew incidence on cucumber from untreated chemicals plot in plastic film house installed with ventilation fan was on a equal level with that from treated chemicals plot with three times application of dimethomorph+copper oxychloride WP in plastic film house without ventilation fan. Meanwhile in order to select optimal chemical application time, dimethomorth+copper oxychloride WP was treated three times at 7 days-interval from three days before the disease occurred, right after the disease occurred, and two days after the disease occurred, respectively. The result showed that dimethomorth+copper oxychloride WP applied to cucumber leaves and stems from three days prior to, right after, two days after occurrence of downey mildew reduced downey mildew incidence by 72.9, 61.8, and 23.7%, respectively. The above results showed that regulation of environmental factors like air relative humidity and preventive application of chemicals should be considered to establish control strategy to downey mildew.

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