Research in Plant Disease 2008;14(2):79-84.
Published online August 30, 2008.
Fusarium oxysporum f. sp. Lactucae에 의한 상추 시들음병 발생 및 품종간 감수성 비교
김진영, 홍순성, 이진구, 이현주, 임재욱, 김진원, 김홍기
Occurrence of Fusarium Wilt Caused by Fusarium oxysporum f. sp. Lactucae and Cultivar Susceptibility on Lettuce
Jin Young Kim, Sun Sung Hong, Jin Gu Lee, Hyun Ju Lee, Jae Wook Lim, Jin Won Kim, Hong Gi Kim
A wilt disease on lettuce was observed in 2006 and 2007 in commercial plastic house at main production areas of lettuce in Icheon, Yongin and Goyang of Gyeonggi Province. The disease was characterized by the wilting of lower leaves, accompanied by stunting symptoms of the whole plants. Old affected stems showed the black streak in the vascular system. The pathogen, Fusarium oxysporum f. sp. lactucae was isolated from stems and roots of diseased plants. Isolated pathogen also produced the microconidia and macroconidia with chlamydospores on carnation leaf agar medium. The pathogen easily invaded and made many chlamydospores on the roots of lettuce and also made dark streaking through the vascular in the lettuce stems. The density of Fusarium sp. in the severely diseased field soil was more higher populations than that in the healthy and less diseased field soil. The minimum population of pathogen would be above 103cfu/g soil to induce the Fusarium wilt on lettuce in plastic house. The results of pathogenicity test showed ``Sunpung`` and ``Mipungpochap`` was high susceptible to Fusarium pathogen isolates while some cultivar ``Mihongjeokchukmyeon`` and ``Jinjachukmyeon`` showed moderate resistance. Disease development for some lettuce was related to treated temperature, so the symptom was more severe above 25oC. Selection of appropriate lettuce cultivar and planting time should be related for the successful control of Fusarium wilt.
Key Words: Fusarium oxysporum, Fusarium wilt, Lettuce, Resistant cultivar

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