• Research in Plant Disease
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• v.16 no.1
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• pp.90-93
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• 2010

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: watersoaked, 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 $2{\sim}14{\times}2{\sim}7mm$ in size. The optimum temperature for mycelial growth and sclerotium formation was at $20^{\circ}C$ on PDA. Apothecia formed on PDA were globose~disk in shape and 3~8 mm in size. Asci were cylindrical in shape and $145{\sim}210{\times}10{\sim}12{\mu}m$ in size. Ascospores were ellipsoid and $10{\sim}14{\times}6{\sim}7{\mu}m$ 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 Strifoliorum Eriksson in Korea.