Sclerotinia Rot of Obedient plant (Physostegia virginiaqna) Caused by Sclerotinia sclerotiorum

Kwon, Jin Hyeuk; Park, Chang Seuk

Research in Plant Disease 2003;9(1):28-31.
Published online March 30, 2003.

Sclerotinia sclerotiorum에 의한 꽃범의 꼬리 균핵병

권진혁, 박창석

Sclerotinia Rot of Obedient plant (Physostegia virginiaqna) Caused by Sclerotinia sclerotiorum

Jin Hyeuk Kwon, Chang Seuk Park

Abstract

A sclerotinia rot was occurred onthe stems of Obedient plant (Physostegia virginiaqna) grown in the exhibition field of Gyeongsangnam-do Agricultural Research and Extension Services, Korea in 2002. The typical symptoms of the disease were that the infected leaves and stems, at first, became dark green, then watery and soft rotted, later. White fluffy mycelia formed on the lesion developed black sclerotia, later. Sclerotia formed on the plants and PDA medium were globose to cylindrical or irregular in shape and 1.0~10.3× 1.0~8.4 mm in size. Aphothecia were cup-shape with numerous asci and 0.8~1.8 cm in diameter. Asci were cylindrical in shape and 84~286×4.7~26.3 mm in size. Ascospores were one cell hyaline, ellipsoid to ovoid in shape, and 7.6~12.8×3.4~6.2 mm in size. The optimum temperature for mycelial growth was 25℃. This is the first report on the sclerotinia rot of Physostegia virginiaqna caused by Sclerotinia sclerotiorum in Korea.

Key Words: Obedient plant, Physostegia virginiaqna, Sclerotinia rot, Sclerotinia sclerotiorum