Until a couple of decades ago, Armillaria spp. had been known to be weak pathogens which are not powerful enough to kill the host trees by itself. However, recent researches support the evidences that A. ostoyae and A. mellea kill the host by itself. Armillaria spp. are distributed world-widely and ...
Until a couple of decades ago, Armillaria spp. had been known to be weak pathogens which are not powerful enough to kill the host trees by itself. However, recent researches support the evidences that A. ostoyae and A. mellea kill the host by itself. Armillaria spp. are distributed world-widely and Korea is not an exception. Now a days, Armillaria root rot is observed at Gyeonggi-, Gangwon-, and Chungchengbuk-do of Korea. In the first experiment of this study, dispersion Armillaria Root Rot in Gwangju-si of Gyenggi-do, Goesan-gun of Chungcheongbuk-do, Mt. Gariwang in Jeongseon-gun of Gangwon-do. Korea. As a result, it was found that the disease moved average 3.53 m in Gwangju-si, 3.88 m in Goesan-gun, and 8.83 m Mt. Gariwang in Jeongseon-gun. Also, it was known that the death ratio of infected trees was 93.8% in Gwangju-si, 31.67% in Mt. Gariwang in Jeongseong-gun. and 14.81% in Goesan-gun. Among the experiment plots, the forest in Goesan-gun was consist of the oldest trees and the forest in Mt. Gariwang was consist of the youngest trees. From these results, it could be said that the death ratio of younger trees is higher than older trees by the infection of Armillaria spp. In the second experiment of the study, Armillaria spp. were isolated from infected trees in the experiment plots. Total 153 isolates were collected: 34 from Gwangju-si, 35 from Goesan-gun, and 84 Mt. Gariwang. All of the isolates were identified A. ostoyae, and they were very close to A. ostoyae. of Japan. In the last part of this study, mycelial growth of Amillaria spp were checked on potato dextrose agar (PDA) medium amended with 0.1, 0.3, 0.5, and 1.0% of EtOH or NaOH. The speed of mycelial growth on PDA amended with EtOH was faster than on pure PDA (control). On the other hand, the mycelial growth was inhibited by the amendment with NaOH. When NaOH was amended to 0.5%, it entirely inhibit the mycelial growth of all Armillaria spp. isolates.
Until a couple of decades ago, Armillaria spp. had been known to be weak pathogens which are not powerful enough to kill the host trees by itself. However, recent researches support the evidences that A. ostoyae and A. mellea kill the host by itself. Armillaria spp. are distributed world-widely and Korea is not an exception. Now a days, Armillaria root rot is observed at Gyeonggi-, Gangwon-, and Chungchengbuk-do of Korea. In the first experiment of this study, dispersion Armillaria Root Rot in Gwangju-si of Gyenggi-do, Goesan-gun of Chungcheongbuk-do, Mt. Gariwang in Jeongseon-gun of Gangwon-do. Korea. As a result, it was found that the disease moved average 3.53 m in Gwangju-si, 3.88 m in Goesan-gun, and 8.83 m Mt. Gariwang in Jeongseon-gun. Also, it was known that the death ratio of infected trees was 93.8% in Gwangju-si, 31.67% in Mt. Gariwang in Jeongseong-gun. and 14.81% in Goesan-gun. Among the experiment plots, the forest in Goesan-gun was consist of the oldest trees and the forest in Mt. Gariwang was consist of the youngest trees. From these results, it could be said that the death ratio of younger trees is higher than older trees by the infection of Armillaria spp. In the second experiment of the study, Armillaria spp. were isolated from infected trees in the experiment plots. Total 153 isolates were collected: 34 from Gwangju-si, 35 from Goesan-gun, and 84 Mt. Gariwang. All of the isolates were identified A. ostoyae, and they were very close to A. ostoyae. of Japan. In the last part of this study, mycelial growth of Amillaria spp were checked on potato dextrose agar (PDA) medium amended with 0.1, 0.3, 0.5, and 1.0% of EtOH or NaOH. The speed of mycelial growth on PDA amended with EtOH was faster than on pure PDA (control). On the other hand, the mycelial growth was inhibited by the amendment with NaOH. When NaOH was amended to 0.5%, it entirely inhibit the mycelial growth of all Armillaria spp. isolates.
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