Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Application of Chitosan Preparations for Eco-friendly Control of Potato Late Blight

감자 역병의 친환경 방제를 위한 키토산 제형의 살포

  • Chang, Taehyun (Division of Ecology and Environmental System, College of Ecology & Enviromental Sciences, Kyungpook National University) ;
  • Kim, Byung Sup (Department of Applied Plant Science, Kangnung Wonju National University)
  • 장태현 (경북대학교 생태환경대학 생태환경시스템학부) ;
  • 김병섭 (강릉원주대학교 식물생명과학과)
  • Received : 2012.06.29
  • Accepted : 2012.11.30
  • Published : 2012.12.31
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Abstract

Potato late blight caused by Phytophthora infestans Cooke is one of the major diseases in the cultivation of potatoes in Korea. Effect of chitosan preparations (SH-1 and SH-2) was evaluated on the inhibition of mycelial growth of P. infestans, and protective activity using detached potato leaf assay both in vivo and in the field test. SH-1 and SH-2 were showed protective activity of young plant with control values more than 95% potato late blight by inoculation with pathogens under growth chamber conditions. Mycelial growth was inhibited the radial growth over 74% at a concentration of $300{\mu}g/ml$ of both SH-1 and SH-2. Spraying with SH-1 and SH-2 on the leaves for detached leaf assay reduced disease development. The content of total polyphenol in stem was significantly increased by SH-1 and SH-2 application in the field. In field experiments, foliar application with both SH-1 and SH-2 were significantly reduced the development of late blight on potato plants. Control of late blight disease was obtained with control values of 72% and 53% by application of 1% SH-1 and SH-2, respectively, with 4 times at 7 days interval, and reduced with similar disease control values by application with 3 times at 14 days interval compared with untreated control. SH-1 and SH-2 applications increased the fresh weight of potato, and higher grade potatoes were also increased. The results showed that SH-1 and SH-2 applications can be used as eco-friendly natural fungicide for organic farming for the increase of yields and control of late blight.

감자역병은 감자재배에서 가장 중요한 병 중의 하나다. 감자역병의 친환경방제를 위하여 SH-1와 SH-2을 이용하여 감자역병균의 균사생장, 예방효과, 잎을 이용한 생물검정 및 포장시험을 통해 평가하였다. 실내에서 유묘를 이용한 시험에서 SH-1와 SH-2 제형을 살포 후 역병균을 접종 후 예방효과를 조사한 결과 95% 이상 발병을 억제하는 효과가 있었다. SH-1과 SH-2의 균사생장 억제 효과는 $300{\mu}g/ml$의 농도에서 균총의 크기를 74% 이상을 억제하였다. 잎을 이용한 생물검정에서 1% SH-1와 SH-2을 살포 후 1시간 뒤에 병원균을 접종한 결과 병의 발달을 줄였다. 감자 줄기에 총 폴리페놀 함량도 SH-1와 SH-2을 살포한 구에서 증가하였다. 포장에서 역병방제효과 시험에서 1% SH-1와 SH-2을 7일 간격 4회 살포한 처리구에서 각각 72%와 53%의 역병 방제 효과가 있었으며, 14일간 3회 살포한 구에도 유사한 병 방제효과를 보였다. 감자비대기에 1% SH-1와 SH-2 살포는 감자 생체 중을 증가시켰으며, 상품의 비율도 높았다. 이 결과에 의하면 SH-1와 SH-2의 살포는 친환경 유기농업에서 천연살균제로서 역병 방제에 사용 할 수 있으며, 감자 수확량도 증가시킬 수 있다.

Keywords

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