Research in Plant Disease 2004;10(2):112-116.
Published online June 30, 2004.
벼깨씨무뉘병균의 월동과 발병조건에 관한 연구
예완해, 이훈섭, 김용기, 심홍식, 지형진, 남기웅
 
Overwintering of the Pathogen and Factors Affecting Disease Develpoment of Rice Brown Spot Caused by Cochliobolus miyabeanus
Wan Hae Yeh, Hoon Seop Lee, Yong Ki Kim, Hong Sik Shim, Hyeong Jin Jee, Ki Woong Nam
Abstract
This study was carried out to investigate factors affecting disease development of rice brown spot caused by Cochliobolus miyabeanus in the field and under the greenhouse conditions. In normal paddy fields, the pathogen was more frequently isolated from dried rice straws than wet straws after overwintering. The pathogen was also readily isolated from wet rice straws of salty paddy fields although infection rate of the fields was low. The disease symptom was first observed at 2 to 3days after inoculation when the seedlings were kept for 6 hours in dew chamber. The number of lesions peaked at 14 hr incubation in cultivars Chucheongbyeo and 24 hr incubation in cultivar Daesanbyeo and Tetep. Sixty three-d-old seedlings were more susceptible than 21 to 49-d-old seedlings regardless of cultivar. There was some difference in number of lesions observed, but the lesions were evenly spread regardless of leaf position. Light on the rice seedlings at 3,000 lux or 6,000 lux showed more severe symptoms than those in the dark.
Key Words: Cochliobolus miyabeanus, Ecology, Overwintering, Sedling age, Leaf position, Rice brown spot


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