Sclerotium Rot of Sponge Gourd Caused by Sclerotium rolfsii

Research in Plant Disease 2012;18(1):54-56.
Published online March 30, 2012.

Sclerotium rolfsii에 의한 수세미오이 흰비단병

권진혁 ( Jin Hyeuk Kwon ) , 김진우 ( Jin Woo Kim ) , 이용환 ( Yong Hwan Lee ) , 심홍식 ( Hong Sik Shim )

Sclerotium Rot of Sponge Gourd Caused by Sclerotium rolfsii

Jin-Hyeuk Kwon*, Jinwoo Kim1, Yong Hwan Lee2 and Hong-Sik Shim3

Gyeongsangnam-do Agricultural Research and Extension Services, Jinju 660-360, Korea
¹Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, Korea
²Rural Development Administration, Suwon 441-707, Korea
³National Academy of Agricultural Science, RDA, Suwon 441-707, Korea

Received: December 30, 2011 Revised: February 10, 2012 Accepted: March 13, 2012

Abstract

Sclerotium rot of sponge gourd occurred at the experimental field of Gyeongsangnam-do Agricultural Research and Extension Services in August 2010. The infected fruits showed water-soaked and rot symptoms. White mycelial mats spread over lesions, and then sclerotia were formed on fruit and near soil line. The sclerotia were globoid in shape, 1?3 mm in size and white to brown in color. The optimum temperature for mycelial growth and sclerotia formation on PDA was 30oC and the hyphal width was 4?8 ?m. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics, ITS rDNA sequence analysis, and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report of sclerotium rot on sponge gourd caused by S. rolfsii in Korea.

Key Words: Sclerotium rolfsii, Sclerotium rot, Sponge gourd