Occurrence of Stem Rot of Houttuynia cordata Thunb. Caused by Sclerotium rolfsii

Park, Kyeng Seok; Park, Jun Hong; Kim, San Young; Choi, Jang Soo

Research in Plant Disease 2006;12(1):55-57.
Published online April 30, 2006.

Sclerotium rolfsii에 의한 약모밀 흰비단병

박경석, 박준홍, 김산영, 최장수

Occurrence of Stem Rot of Houttuynia cordata Thunb. Caused by Sclerotium rolfsii

Kyeng Seok Park, Jun Hong Park, San Young Kim, Jang Soo Choi

Abstract

Stem rot of Houttuynia cordata occurred in the experiment field of Research Institute of Natural Product, Uiseong, Gyeongbuk, Korea in July 2003. The typical symptoms of the disease were water-soaking, stem rot, necrotic tuber. White mycelial mats were spread over lesions and sclerotia were formed on died plant and near soil line. The sclerotia were spherical and irregular, 1-2.5 mm on potato dextrose agar (PDA), white to brown in color. The optimal temperature for hyphal growth was 28~30oC and the hyphal diameter was 3~9 μm. Clamp connections were observed on PDA. Pathogenicity of the casual organism was provided on H. cordata according to Koch``s postulate. The fungus was identified as Sclerotium rolfsii Saccardo on the basis of mycological characteristics and pathogenicity test to host plants. This is the first report on the stem rot of H. cordata caused by S. rolfsii in Korea.

Key Words: Houttuynia cordata, Sclerotium rolfsii, Stem rot