Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Effect of Nutrition Solution pH and Electrical Conductivity on Fusarium Wilt on Strawberry Plants in Hydroponic Culture

딸기 수경재배에서 시들음병 발생에 배양액 pH와 EC 효과

  • Nam, Myeong Hyeon (Nonsan Strawberry Experiment Station, Fruit Vegetable Research Institute, Chungnam ARES) ;
  • Lee, Hee Chul (Nonsan Strawberry Experiment Station, Fruit Vegetable Research Institute, Chungnam ARES) ;
  • Kim, Tae il (Nonsan Strawberry Experiment Station, Fruit Vegetable Research Institute, Chungnam ARES) ;
  • Lee, Eun Mo (Nonsan Strawberry Experiment Station, Fruit Vegetable Research Institute, Chungnam ARES) ;
  • Yoon, Hae Suk (Horticultural Research Division, Gyeongnam ARES)
  • 남명현 (충남농업기술원과채연구소 논산딸기시험장) ;
  • 이희철 (충남농업기술원과채연구소 논산딸기시험장) ;
  • 김태일 (충남농업기술원과채연구소 논산딸기시험장) ;
  • 이은모 (충남농업기술원과채연구소 논산딸기시험장) ;
  • 윤혜숙 (경남농업기술원)
  • Received : 2017.11.11
  • Accepted : 2017.12.12
  • Published : 2018.03.31
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Abstract

Fusarium wilt on strawberry plants caused by Fusarium oxysporum f. sp. fragariae (Fof) is a major disease in Korea. The prevalence of this disease is increasing, especially in hydroponic cultivation in strawberry field. This study assessed the effect of nutrition solution pH and electrical conductivity (EC) on Fusarium wilt in vitro and in field trials. pH levels of 5.0, 5.5, 6.0, 6.5, 7.0, and 7.5 were assayed in vitro and in field trials. EC levels at 0, 0.5, 0.8, 1.0, and $1.5dS{\cdot}m^{-1}$ were assayed in field trials. Mycelial growth of Fof increased with increasing pH and was highest at $25^{\circ}C$ pH 7 and lowest at $20^{\circ}C$, pH 5.0 in vitro. The incidence of Fusarium wilt was lowest in the pH 6.5 treatment and highest in the pH 5 treatment in field trials. At higher pH levels, the EC decreased in the drain solution and the potassium content of strawberry leaves increased. In the EC assay, the severity of Fusarium wilt and nitrogen content of leaves increased as the EC increased. These results indicate that Fusarium wilt is related to pH and EC in hydroponic culture of strawberry plants.

Fusarium oxysporum f. sp. fragariae (Fof)에 의한 딸기 시들음병은 국내에서 중요한 병해이다. 특히 딸기재배에서 시들음병 발생은 수경재배 면적이 증가하면서 증가하는 경향을 보이고 있다. 따라서 이 연구에서는 딸기 수경재배에서 시들음병 발생에 배양액의 pH와 EC의 영향을 in vitro와 재배포장에서 조사하였다. pH는 5, 5.5, 6, 6.5, 7, 7.5로 in vitro와 재배포장에서 검정하였고 EC는 0, 0.5, 0.8, 1, $1.5dS{\cdot}m^{-1}$로 재배포장에서 조사하였다. In vitro 상에서 딸기 시들음병균의 균사생육은 pH가 증가하면서 증가하였고 $25^{\circ}C$, pH 7에서 최대였으며 $20^{\circ}C$, pH 5에서 가장 낮았다. 재배포장에서 딸기 시들음병 발생은 pH 6.5에서 가장 낮았고 pH 5에서 가장 높은 경향을 보였다. 배양액의 pH는 높아질수록 배액의 EC는 감소하였고 딸기 잎의 칼륨함량은 증가되었다. EC 검정에서 배양액 EC가 상승함에 따라 딸기 시들음병 발생과 잎의 질소함량은 증가하였다. 이런 결과로 딸기 시들음병 발생은 수경재배에서 pH와 EC가 관련이 있다는 것을 알 수 있었다.

Keywords

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