Stem Rot of Common Bean (Phaseolus vulgaris L.) Caused by Sclerotium rolfsii

Research in Plant Disease 2012;18(2):139-141.
Published online June 30, 2012.

단보 : Sclerotium rolfsii에 의한 강낭콩 흰비단병

권진혁 ( Jin Hyeuk Kwon ) , 강동완 ( Dong Wan Kang ) , 곽연식 ( Youn Sig Kwak ) , 최옥희 ( Ok Hee Choi ) , 한성숙 ( Seong Sook Han )

Stem Rot of Common Bean (Phaseolus vulgaris L.) Caused by Sclerotium rolfsii

Jin-Hyeuk Kwon*, Dong-Wan Kang, Youn-Sig Kwak1, Okhee Choi1 and Seong-Sook Han2

Gyeongsangnam-do Agricultural Research and Extension Services, Jinju 660-360, Korea
¹Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, Korea
²Crop Environment Research Division, National Institute of Crop Science, RDA, Suwon 441-857, Korea

Received: May 29, 2012 Revised: June 07, 2012 Accepted: June 08, 2012

Abstract

Stem rot symptoms of common bean occurred sporadically in Jinju, Korea. The typical symptom included water-soaking on the main stem, rotting, wilting, and blighting, which eventually leads to death of the plant. The sclerotia, white to brown, spherical with size of 1-3 mm, formed over lesions and surface soil line. The optimum temperature for mycelial growth and sclerotia formation was 30oC on potato dextrose agar (PDA). The typical clamp connections were observed in the hyphae of the fungus grown on PDA. Mycological characteristics and pathogenicity to host plants indicated that the fungus was Sclerotium rolfsii Saccardo. This is the first report of stem rot on common bean caused by S. rolfsii in Korea.

Key Words: Common bean, Sclerotium rolfsii, Stem rot