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자료유형
학술저널
저자정보
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고려인삼학회 Journal of Ginseng Research 고려인삼학회지 제28권 제4호
발행연도
2004.12
수록면
183 - 190 (8page)

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On May of 2002, the 34 isolates of Rhizoctonia solani were isolated from the symptom of damping-off on basal stems of 2-year-old to 6-year-old Panax ginseng which were cultivated in the 17 fields in Kyunggi-do, Chungcheungnam-do and Jeollabuk-do province in Korea. All isolates were identified as anastomosis group 2-1. Pre-emergence damping-off occurred on underground part of stem of 2-year-old ginseng in the pot trial with artificial inoculation. However, in the 4-year-old ginseng field with artificial inoculation, post-emergence damping-off occurred. The severe incidence of damping-off was found in the 6-year-old ginseng field in Kimje-si, Jeollabuk-do province on June 5 of2003, the rate of which showed 18.6% of area in the field by spread of the disease since 2-year-old. The sclerotia of R. solani, started to be formed after 7 days incubation on potato dextrose agar at 25℃, were grayish brown, spherical to irregular and about 500 ㎛ in diameter, which became dark brown after 14 days incubation. The temperature range for the mycelial growth of R. so/ani isolates was 5~30℃, and the optimal temperature was 25℃, their growth were very poor at 5 or 30℃. The isolates grew at the range of pH 4.5~8.1 tested and optimal pH for growth was pH 4.5~5.8, whereas their growth were very poor above the pH 7.2.

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