Occurrence of Fruit Rot of Pumpkin Caused by Sclerotium rolfsii

Kwon, Jin Hyeuk; Shen, Shun Shan; Chae, Yun Seok; Park, Chang Seuk

Research in Plant Disease 2007;13(1):53-56.
Published online April 30, 2007.

Sclerotium rolfsii에 의한 호박 흰비단병 발생

권진혁, 신순선, 채윤석, 박창석

Occurrence of Fruit Rot of Pumpkin Caused by Sclerotium rolfsii

Jin Hyeuk Kwon, Shun Shan Shen, Yun Seok Chae, Chang Seuk Park

Abstract

The fruit rot of pumpkin caused by Sclerotium rolfsii occurred sporadically at Gyeongsangnam-do Agricultural Research and Extension Services, Korea in 2004 and 2005. The typical symptom of the disease included water-soaking, fruit rotting and wilting. White mycelial mats were spread over infected fruits and then sclerotia were formed on the lesions and near soil surface. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature for mycelial growth and sclerotia formation was at 30oC on PDA and the hyphal width ranged from 4 to 8 μm. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the fruit rot of Cucurbita spp. caused by S. rolfsii in Korea.

Key Words: Fruit rot, Pumpkin, Sclerotium rolfsii