Research in Plant Disease 2004;10(4):324-330.
Published online December 31, 2004.
Sclerotinia sclerotiorum에 의한 결구상추 균핵병(Sclerotinia rot)의 발생과 병원성
백정우1, 김한우, 김현주1, 박종영1, 이광열1, 이진우1, 정순재1, 문병주1,*
동아대학교 농업생명연구소, 1동아대학교 생명자원과학대학
 
Occurrence of Sclerotinia Rot of Crisphead Lettuce Caused by Sclerotinia sclerotiorum and Its Pathogenicity
Jung-Woo Baek1, Han-Woo Kim, Hyun-Ju Kim1, Jong-Young Park1, Kwang-Youll Lee1, Jin-Woo Lee1, Soon-Je Jung1, Byung-Ju Moon1,*
Center for Biotechnology, Dong-A University, Busan 604-714, Korea
1College of Natural Resources and Life Science, Dong-A University, Busan 604-714, Korea
Correspondence:  Byung-Ju Moon,Phone)+82-51-200-7554, Fax)+82-51-200-6993, E-mail)bjmoon@daunet.donga.ac.kr
Received: November 22, 2004
Abstract
This studies were investigated the occurrence of sclerotinia rot at the crisphead lettuce field in Uiryeong-Gun, Gyeongsangnam-Do from January to May in 2003. Average incidence rates of sclerotinia rot on crisphead lettuce was up to 21.9% at the five plastic houses. A total of 140 isolates of Sclerotinia sp. were obtained from diseased leaves of crisphead lettuce. Among them, the fungi YR-1 was isolated, which showed highly virulent on the whole plant. the YR-1 was identified as Sclerotinia sclerotiorum based on the formation, color, shape and size of sclerotium and apothecium. For the pathogenicity test, the most suitable inoculum quantity of YR-1 strain was selected as the triturated mycelial suspension of A550=0.8, 40 ml showing disease incidence of 94%, and the symptom showed as same as at the fields, the leaves and stem had rotten and developed white downy mycelial at the diseased lesion on the leaves and stems, and produced black and irregular sclerotinia. This is the first report on the pathogenicity test using by triturated mycelial suspension-inoculum of the pathogen for the sclerotinia rot of crisphead lettuce.
Key Words: Crisphead lettuce, Pathogenicity test, Sclerotinia rot, Sclerotinia sclerotiorum


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