• 식물병연구
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• 제10권4호
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• pp.268-271
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• 2004

작약검은뿌리썩음병은 연작을 할 경우 현저히 발생이 증가하였으며, 태백작약 품종에 비해 의성작약 품종에서 좀 더 심한 발병을 보였다. 종구로 사용하는 뇌두를 약제에 침지시 병원균은 검출되지 않았으나 물에만 침지한 경우 병원균이 검출되었다. 연작지의 토양개량시 검은뿌리썩음병의 방제는 효과가 없었으나 다조메입제로 토양을 훈증소독할 경우 토양훈증처리구에서 주근중과 근장이 단순연작구와 비교하여 50% 정도 증가하였으며 검은뿌리썩음병의 발병율은 무처리구의 경우 40.6% 정도 발병되었으나 토양훈증처리구는 4.7% 정도로 발병되어 아주 높은 방제효과를 보였으며 종구소독과 훈증처리를 병행시 발병율은 더욱 낮아졌다.

• Journal of Ginseng Research
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• 제20권1호
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• pp.88-95
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• 1996

The effects of media, incubation time, temperature and pH on production of conidia and chlamydospore of Cylindrocarpon destructans (Zinssm.) Scholen causing root rot of Panax ginseng were studied. Microconidia of the pathogen were abundantly produced on V-8 juice agar as a solid substrate with 5.73(log conidia/mm2) and in V-8 broth as a liquid substrate with 6.65 (log conidia/ml) among media tested. No difference was observed on the length of microconidia produced from the media with a range of 9.50∼11.38 $\mu\textrm{m}$. However, tryptic soy agar produced the broadest microconidia (average 5.00 $\mu\textrm{m}$) among the media tested. All the media produced chlamydospores In a range of 1.06∼4.37 (log chlamydospores/mm2) without a significant difference in number, while V-8 juice agar produced the bigger one (18.39 $\mu\textrm{m}$ in diameter) as compared to the tested media. The fungus began to sporulate conidia after three days of incubation and reached maximum at the 8th day. It seemed to be in a stationary phase until 30 days of incubation but was decreased thereafter. Chlamydospore was produced at 4th day after incubation. Maximum production was observed at 8th day and the number seemed to be maintained during the observation period. Both conidia and chlamydospore of the pathogen were able to be spoluated at 10∼25$^{\circ}C$. However, optimum temperatures of conidia and chlamydospore formation were 15∼25$^{\circ}C$ and 10∼20$^{\circ}C$, respectively. C. destrmtans produced conida with an wide range of pH from 3.3 to 8.0 and chlamydospore from 2.8 to 8.0. Number of conidia was increased with an increase of pH up to 4.0. There was no significant difference in the number between 4.0 to 8.0. It seemed to have two optimum pH ranges, 3.3∼4.0 and 7.1∼8.0 for the chlamydospore formation.