Occurrence of Stem Rot of Elsholtzia splendens Caused by Sclerotium rolfsii

Kwon, Jin Hyeuk; Park, Chang Seuk

Research in Plant Disease 2008;14(2):131-133.
Published online August 30, 2008.

Sclerotium rolfsii에 의한 꽃향유 흰비단병 발생

권진혁, 박창석

Occurrence of Stem Rot of Elsholtzia splendens Caused by Sclerotium rolfsii

Jin Hyeuk Kwon, Chang Seuk Park

Abstract

From 2006 to 2007, the stem rot of Elsholtzia splendens Nakai caused by Sclerotium rolfsii occurred sporadically in an herbs exhibition at Gyeongsangnam-do Agricultural Research and Extension Services, Korea. The typical symptom is water-soaking, dark brown on the stem and rotting, wilting and blighting. The infected plants were mostly died. White mycelial mats were spread over lesions, and then sclerotia were formed on stems and near soil line. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature and sclerotia on PDA was 30oC and the hyphal width was 4~9 μm. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the stem rot of E. splendens caused by S. rolfsii in Korea.

Key Words: Elsholtzia splendens, Sclerotium rolfsii, Stem rot