| 마늘 흑색썩음균핵병 발생에 관여하는 여러 가지 경종적 요인 |
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김용기, 권미경, 심홍식, 김택수, 예완해, 조원대, 최인후, 이성찬, 고숙주, 이용환, 이찬중 |
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| Various Cultural Factors Associated with Disease Development of Garlic White Rot Caused by Two Species of Sclerotium |
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Yong Ki Kim, Mi Kyung Kwon, Hong Sik Shim, Tack Soo Kim, Wan Hae Yeh, Weon Dae Cho, In Hu Choi, Seong Chan Lee, Sug Ju Ko, Yong Hwan Lee, Chan Jung Lee |
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| Abstract |
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This study was conducted to investigate the control possibility of garlic white rot causing severe yield losses of Allium species and cultivars using cultural practices such as optimal sowing date and burial depth, and lime application. Inoculum density in infested field soil was investigated at different soil depth, and that on the diseased plant debris was done. Inoculum density and recovery ratio of white rot pathogen of garlic was highly different between two species of Sclerotium cepivorum forming comparatively small sclerotia and Sclerotium sp. forming comparatively large ones. It was confirmed that S. cepivorum formed more sclerotia on bulbs of garlic than S. sp., and sclerotial recovery of S. cepivorum was higher than that of S. sp. Inoculum density of white rot pathogen in the infested field at garlic seeding period ranged from one to thirteen sclerotia per 30 g soil. Inoculum density of white rot pathogen decreased remarkably with increasing soil depth and above 95% of sclerotia were distributed within 5 cm of soil depth. Disease severity of white rot was higher on slightlyplanted garlics than deeply-planted ones. Garlic seed bulbs infected by white rot pathogens were confirmed to be one of main inoculum sources of white rot in the field and the disease incidences caused by garlic seed transmission showed big differences among garlic varieties. When nine garlic varieties harvested from infested plots were sown in the field, highly susceptible varieties, ``Wando``, ``Daeseo``, ``Namdo`` and ``Kodang`` showed high disease incidences, whereas other five varieties were not infected at all. It was confirmed that white rot occurred higher on early-sown garlics, before middle October, than on late-sown ones, after late October. Meanwhile, increasing application rate of lime ranged from 100 to 300 g reduced disease severity of white rot. |
| Key Words:
Allium, Cultural practice, Sclerotium cepivorum, Sclerotium sp., White rot |
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