A Canker Disease of Populus × euramericana in China Caused by Lonsdalea quercina subsp. populi
- Yong Li , The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, and The Key Laboratory of State Forestry Administration on Forest Protection, Research Institute of Forest Ecology Environment and Protection, Chinese Academy of Forestry, Beijing 100091
- Wei He
- Feijuan Ren , The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083
- Limin Guo
- Jupu Chang , Forestry Research Institute of Puyang, Henan Puyang, China
- Ilse Cleenwerck , BCCM/LMG Bacteria Collection, Ghent University, Laboratory of Microbiology, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
- Yuchao Ma , Beijing Forestry University, Beijing 100083
- Haiming Wang , Forest Protection Station, Heze, Shandong province, China
Abstract
In 2006, a new canker was observed on trees of Populus × euramericana ‘74/76’ and P. × euramericana ‘Zhonglin 46’ in the Henan and Shandong provinces of China. The disease, which is characterized by canker with white exudates dripping from the bark, occurred mainly in the summer. A particular gram-negative, rod-shaped bacterium was repeatedly isolated from the infected samples and proven to infect trees of P. × euramericana by Koch's postulates. Through a polyphasic taxonomic approach using sequence, DNA-DNA hybridization, chemotaxonomic, and phenotypic data, the poplar isolates were identified as Lonsdalea quercina subsp. populi, a subspecies very recently described based on isolates from oozing bark canker of poplar (P. × euramericana) trees in Hungary.
