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Journal of Integrative Agriculture  2020, Vol. 19 Issue (4): 889-897    DOI: 10.1016/S2095-3119(19)62882-0
Special Focus: Bleeding canker of pear-An emerging devastating disease Advanced Online Publication | Current Issue | Archive | Adv Search |
Bleeding canker of pears caused by Dickeya fangzhongdai: Symptoms, etiology and biology
CHEN Bin1, TIAN Yan-li1, ZHAO Yu-qiang2, WANG Jia-nan1, XU Zhi-gang1, LI Xiang3, HU Bai-shi
1 College of Plant Protection and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, P.R.China
2 Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen)/Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, P.R.China
3 Charlottetown Laboratory, Canadian Food Inspection Agency, Charlottetown, PE C1A5T1, Canada
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Bleeding canker, a devastating disease of pear trees (Pyrus pyrifolia L.), was first reported in the 1970s in Jiangsu, China and more recently in other provinces in China.  Trees infected with bleeding canker pathogen, Dickeya fangzhongdai, develop cankers on the trunks and branches, and a rust-colored mixture of bacterial ooze and tree sap could be seen all over the trunks and branches.  In this study, we provided detail descriptions of the symptoms and epidemiology of bleeding canker disease.  Based on pathogenic and phenotypic characterizations, we identified the causal agent of bleeding canker of pear as D. fangzhongdaiDickeya fangzhongdai strains isolated from pear were also pathogenic on Solanum tuberosum, Brassica pekinensis, Lycopersicon esculentum, and Phalaenopsis aphrodite based on artificial inoculation, and the pathogen were more virulent on potato than that of D. solani strain.  This study provides new information about this disease and bleeding canker disease of pear.

Keywords:  pear        bleeding canker        Dickeya fangzhongdai        symptoms        pathogenicity  
Received: 13 November 2019   Accepted: 04 March 2020
Fund: This research was supported by the 111 International Cooperation Grant 2.0 (BP0719029) to Nanjing Agricultural University, China, from the Chinese government and Canadian Interdepartmental funding of Genomics Research and Development Initiatives (GRDI).
Corresponding Authors:  Correspondence HU Bai-shi, E-mail:; LI Xiang, E-mail:   

Cite this article: 

CHEN Bin, TIAN Yan-li, ZHAO Yu-qiang, WANG Jia-nan, XU Zhi-gang, LI Xiang, HU Bai-shi. 2020. Bleeding canker of pears caused by Dickeya fangzhongdai: Symptoms, etiology and biology. Journal of Integrative Agriculture, 19(4): 889-897.

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