| 인삼 뿌리썩음병 발병에 미치는 환경 요인 |
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이중섭1* · 한경숙2 · 이성찬2 · 소재우2 · 김두욱2 |
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1국립원예특작과학원 사과시험장, 2국립원예특작과학원 원예특작환경과 |
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| Environmental Factors on the Development of Root Rot on Ginseng Caused by Cylindrocarpon destructans |
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Jung Sup Lee1*, Kyung Sook Han2, Seong Chan Lee2, Jae Woo Soh2 and Doo Wook Kim2 |
1Apple Research Station, National Institute of Horticultural and Herbal Science, Gunwei 716-812 , Korea
2Department of Horticultural Environment, National Institute of Horticultural and Herbal Science, Suwon 440-706, Korea |
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Correspondence:
<p>Jung Sup Lee</p><p>Tel : +82-, Jung Sup Lee Tel : +82-54-380-3170
Fax: +82-54-380-3125
E-mail: suel3841@korea.kr |
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Received: February 28, 2014 Revised: May 20, 2014 Accepted: May 28, 2014 |
| Abstract |
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The fungus Cylindrocarpon destructans is the cause of root rot in many ginseng production areas in Korea. A total of 57 isolates of C. destructans were recovered from diseased roots in a survey of ginseng?growing fields from 2011-2012. Among these isolates, 37% were classified as highly virulent (causing lesions on unwounded mature roots) and 61% were weakly virulent(causing lesions only on previously wounded roots). Radial growth of highly and weakly virulent isolates on potato dextrose agar was highest at 20°C and there was no growth at 35°C. Mycelial mass production was significantly (P = 0.05) lower at pH 7.0 compared with pH 5.0. To study the effects of pH (5.0 and 7.0) and wounding on disease development, ginseng roots were grown hydroponically in nutrient solution. Lesions were significantly larger (P < 0.01) at pH 5.0 compared with pH 7.0 and wounding enhanced disease by a highly virulent isolate at both pHs. In artificially infested soil, 2-yearold ginseng roots were most susceptible to Cylindrocarpon root rot among all root ages tested (1 to 4 years) when evaluated using a combined scale of disease incidence and severity. Root rot severity was significantly (P<0.05) enhanced by increasing the inoculum density from 3.5 × 102 cfu/g of soil to 2.0×103 cfu/g of soil. |
| Key Words:
Disappearing root rot, Disease index, Epidemiology, Pathogenicity |
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