Plant Pathol J > Volume 23(4); 2007 > Article
The Plant Pathology Journal 2007;23(4):314-317.
DOI: https://doi.org/10.5423/PPJ.2007.23.4.314    Published online December 31, 2007.
First Report on Bacterial Soft Rot of Graft-cactus Chamaecereus silvestrii Caused by Pectobacterium carotovorum subsp. carotovorum in Korea
Jeong Ho Kim, Yong Ho Joen, Sang Gyu Kim, Young Ho Kim
Abstract
A soft stem rot disease was observed on Chamaecereus silvestrii (Korean name: Sanchui), a scion of graftcactus, in major growing areas of Suwon (National Horticulture Research Institute), Anseong, Eumseong, Cheonan, Daegu, and Goyang, Korea during 2000 and 2001. Typical symptoms were soft rots characterized by moist and watery decay of the whole cactus stem, which initiated as small water-soaked lesions and enlarged rapidly to the entire stem. The causal organism isolated from the infected stems was identified as Pectobacterium carotovorum subsp. carotovorum (Erwinia carotovora subsp. carotovora) based on its physiological and biochemical characteristics and confirmed by the cellular fatty acid composition and Biolog analyses. Artificial inoculation of the bacterium produced the same soft rot symptoms on the cactus stems, from which the same bacterium was isolated and identified. This is the first report of the P. carotovorum subsp. carotovorum in the graft-cactus C. silvestrii in Korea.
Key Words: bacterial soft rot, Chamaecereus silvestrii, graft-cactus, Pectobacterium carotovorum subsp. carotovorum


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