Sclerotium Rot of Onion Caused by Sclerotium rolfsii

Kwon, Jin Hyeuk; Kim, Hee Dae; Choi, Ok Hee; Kwak, Youn Sig; Lee, Yong Hwan; Shim, Hong Sik

Research in Plant Disease 2011;17(2):222-224.
Published online August 30, 2011.

Sclerotium rolfsii에 의한 양파 흰비단병

권진혁, 김희대, 최옥희, 곽연식, 이용환, 심홍식

Sclerotium Rot of Onion Caused by Sclerotium rolfsii

Jin Hyeuk Kwon, Hee Dae Kim, Ok Hee Choi, Youn Sig Kwak, Yong Hwan Lee, Hong Sik Shim

Abstract

The sclerotium rot of onion (Allium cepa L.) was occurred sporadically in the farmer`s fields at Daehap, Changnyeong in Korea. The typical symptom was water-soaking on the bulb, stem and leaves and then rotting, wilting, blighting and the infected plants eventually were rotted and died. The sclerotia were globoid, 1-3 mm, and white to brown. The optimum temperature for mycelial growth and sclerotial formation on PDA was 30℃. The hyphal width was 4-9 ?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, this fungus was identified as Sclerotium rolfsii Saccardo. To our knowledges, this is the first report of sclerotium rot on onion caused by S. rolfsii in Korea.

Key Words: Allium cepa, Onion, Sclerotium rolfsii, Sclerotium rot