Sclerotinia Rot of Astragalus sinicus Caused by Sclerotinia trifoliorum

Kwon, Jin Hyeuk; Lee, Heung Su; Lee, Yong Hwan; Shim, Hong Sik

Research in Plant Disease 2010;16(1):90-93.
Published online April 30, 2010.

Sclerotinia trifoliorum에 의한 자운영 균핵병

권진혁, 이흥수, 이용환, 심홍식

Sclerotinia Rot of Astragalus sinicus Caused by Sclerotinia trifoliorum

Jin Hyeuk Kwon, Heung Su Lee, Yong Hwan Lee, Hong Sik Shim

Abstract

Sclerotinia rot occurred sporadically on the stems and leaves of Astragalus sinicus in the farmers fields at Goseong-gun, Gyeongnam province in Korea. The infected plants showed the typical symptoms: water-soaked, wilt, rot, blight and eventual death. The colony of the isolated fungus on potato-dextrose agar (PDA) was white to faintly gray color. Sclerotia formed on the PDA were globose in shape, black in color and 2~14×2~7 mm in size. The optimum temperature for mycelial growth and sclerotium formation was at 20℃ on PDA. Apothecia formed on PDA were globose~disk in shape and 3~8 mm in size. Asci were cylindrical in shape and 145~210×10~12 μm in size. Ascospores were ellipsoid and 10~14×6~7 μm in size. On the basis of mycological characteristics and pathogenicity test on host plants, the fungus was identified as Sclerotinia trifoliorum Eriksson. This is the first report on sclerotinia rot of A. sinicus caused by S. trifoliorum Eriksson in Korea.

Key Words: Astragalus sinicus, Sclerotinia rot, Sclerotinia trifoliorum