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Control Effect of Phosphate Compounds on Phytophthora Blight and Anthracnose of Pepper

고추 역병과 탄저병에 대한 인산염 화합물의 방제 효과

  • Park, Seojeong (Department of Plant Medicine, College of Agriculture, Life & Environment Sciences, Chungbuk National University) ;
  • Kim, Heung Tae (Department of Plant Medicine, College of Agriculture, Life & Environment Sciences, Chungbuk National University)
  • 박세정 (충북대학교 농업생명환경대학 식물의학과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Received : 2017.01.18
  • Accepted : 2017.03.13
  • Published : 2017.03.31

Abstract

Antimicrobial activity of 6 phosphate compounds as $H_3PO_3$, $H_3PO_4$, $K_3PO_4$, $K_2HPO_4$, $KH_2PO_4$ and $NH_4H_2PO_4$ against Phytophthora capsici JHAW 1-2 and Colletotrichum acutatum JC24 was investigated in this study. Inhibitory effect on zoospore release, zoosporangia germination and zoospore germination was superior than mycelial growth. Among 6 compounds, $H_3PO_3$ and $H_3PO_4$ showed the best antimicrobial activity against P. capsici JHAW 1-2. Diseases controlling activity of the phosphate compounds tested on seedling and fruit of pepper against Phytophthora blight was also better than those against anthracnose. When $H_3PO_3$ was applied to the pepper seedlings at a concentration of $100{\mu}g\;mL^{-1}$, severe phytotoxicity was occurred. However, with applying $10{\mu}g\;mL^{-1}$ of $H_3PO_3$ showed 100% the disease control efficacy. In case of $100{\mu}g\;mL^{-1}$ $H_3PO_4$ application showed excellent antimicrobial activity against P. capsici JHAW 1-2, and 56.7% of the disease control efficacy with no phytotoxicity. To investigate the control efficacy against anthracnose, conidia suspension was inoculated with non-wound and wound inoculation method on pepper fruit. Among 6 compounds, only $100{\mu}g\;mL^{-1}$ of $H_3PO_3$ and $H_3PO_4$ had a activity of more than 70%, but the control activity on other treatments was minimal or unacceptable.

Keywords

Anthracnose;Pepper;Phosphate compounds;Phytophthora blight

Acknowledgement

Supported by : 충북대학교

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