밤나무 재배지에서의 생물적, 환경적 요인이 밤나무 줄기마름병 발생에 미치는 영향

초록

Chestnut trees have been severely damaged by the various cankers in Korea. Field surveys forelucidating the relationships between disease occurrence and environmental factors, i.e., tree age, temperature,rainfal precipitation, direction, degre of slope, chemical properties of soils, and so on, were carried out in thechestnut tree plantations located at Gyeongnam, Jeonnam, Chungnam, and Gyeonggi-Do Province. Totally, onethousand and one hundred thirty seven trees from 36 experiment plots were investigated. Trees infected by at leastone of the canker fungi were estimated up to 66%. The most severely infested area was Sunchon in JeonnamDisease occurrence was found to be highly correlated with tree age. The disease occurred most frequently on treesranged from 7 to 12 years old, while it was relatively low on tres below 5 years old or above 25 years old.Canker positions on the tree formed by the pathogenic fungi were most often at 1.6-2.0m above the ground. Overfive hundreds bark samples from the canker area on the tree were collected and the pathogenic fungi were isolated.The most commonly isolated fungus was identified as Cryphonectria parasitica, the chestnut blight fungus.

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