| 토마토 수경재배에서 배양액의 pH 조절에 의한 풋마름병 방제 |
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이중섭, 최지호, 서상태, 한경숙, 박종한, 장한익 |
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| Control of Tomato Wilt Disease by Amending pH of Nutrient Solution in Hydroponic System |
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Jung Sup Lee, Ji Ho Choi, Sang Tae Seo, Kyoung Suk Han, Jong Han Park, Han Ik Jang |
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| Abstract |
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The effect of pH on the survival of R. solanacearum and its transmission via roots of tomato in hydroponic culture were studied in laboratory and greenhouse. In laboratory experiment, R. solanacearum could not survive for 24h in nutrient solution with pH of 4 · 0 or 4 · 5, while 1, 14, 51 and 62% of inoculum survived at pH 5 · 0, 5 · 5, 6 · 0 and 6 · 5, respectively. When tomato plants were inoculated with R. solanacearum through wounds on the stems, the bacteria moved downward from the inoculation site to the roots and infectious bacteria were released from the roots into the nutrient solution. Of two pH regimes tested in greenhouse nutrient-film technique(NFT) culture, the R. solanacearum population was significantly lower in pH 5.0 than in pH 6.5 in most sampling data. In treatments in which R. solanacearum was introduced by transplanting two root-inoculated plants, significantly more plants developed wilt at pH 6·5(34 out of 48 plants) than at pH 5.0(11 out of 48 plants). In addition, when the bacterium was introduced by transplanting two stem-inoculated plants at pH 6 · 5, seven out of 24 plants developed wilt. |
| Key Words:
Hydroponics, pH, Ralstonia solanacearum, Tomato bacterial wilt |
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