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| Curent Situation of “Candidatus Liberibacter asiaticus” in Guangdong, China, Where Citrus Huanglongbing Was First Described |
| DENG Xiao-ling, CHEN Jian-chi, KONG Wei-wen, LI Hua-ping |
1.Laboratory of Citrus Huanglongbing Research, South China Agricultural University, Guangzhou 510642, P.R.China
2.San Joaquin Valley Agricultural Sciences Center, USDA-ARS, Parlier, California 93648, USA
3.School of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, P.R.China |
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摘要 Citrus Huanglongbing (HLB, yellow shoot disease) was first observed in the coastal Chaoshan Plain of Guangdong Province, China, in the late 19th century based on descriptions of yellow shoot symptoms. “Candidatus Liberibacter asiaticus” has been considered as a putative pathogen associated with HLB since 1994. Information about the curent prevalence of this bacterium is important for HLB control in Guangdong and also provides useful reference for HLB study elsewhere. In 2007, we collected HLB symptomatic citrus samples from 16 cultivars in 12 prefecture cities, mostly in the north and west regions of Guangdong, where major citrus fruits are currently produced. Among the 359 samples collected, 241 (67.1%) were positive for “Ca. L. asiaticus”, distributed in 15 out of the 16 cultivars from all 12 cities, indicating the widespread prevalence of “Ca. L. asiaticus” in Guangdong Province. The detection rates varied from 16.7 to 100% depending on location and cultivar. Lower detection rates were found in newer citrus cultivation cities among the previously less popular but now promoted cultivars. In reviewing the citrus management and pest control practice, we believe that infected nursery stocks play a key role in the current spread of “Ca. L. asiaticus”.
Abstract Citrus Huanglongbing (HLB, yellow shoot disease) was first observed in the coastal Chaoshan Plain of Guangdong Province, China, in the late 19th century based on descriptions of yellow shoot symptoms. “Candidatus Liberibacter asiaticus” has been considered as a putative pathogen associated with HLB since 1994. Information about the curent prevalence of this bacterium is important for HLB control in Guangdong and also provides useful reference for HLB study elsewhere. In 2007, we collected HLB symptomatic citrus samples from 16 cultivars in 12 prefecture cities, mostly in the north and west regions of Guangdong, where major citrus fruits are currently produced. Among the 359 samples collected, 241 (67.1%) were positive for “Ca. L. asiaticus”, distributed in 15 out of the 16 cultivars from all 12 cities, indicating the widespread prevalence of “Ca. L. asiaticus” in Guangdong Province. The detection rates varied from 16.7 to 100% depending on location and cultivar. Lower detection rates were found in newer citrus cultivation cities among the previously less popular but now promoted cultivars. In reviewing the citrus management and pest control practice, we believe that infected nursery stocks play a key role in the current spread of “Ca. L. asiaticus”.
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Received: 07 April 2011
Accepted:
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| Fund: This research was supported by the Chinese Modern Agricultural Technology Systems (CARS-27) and the Special Fund for Agro-Scientific Research in the Public Interest, China (2010003067), and the project of Asian Citrus Psyllid and Huanglongbing Field Research and Outreach by North Carolina State University and United State Department of Agriculture (2010-0195-02). |
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Corresponding Authors:
Correspondence DENG Xiao-ling, Mobiel: 13925067776, Fax: +86-20-38297040, E-mail: xldeng@scau.edu.cn; LI Hua-ping, E-mail: huaping@scau.edu.cn
E-mail: xldeng@scau.edu.cn
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Cite this article:
DENG Xiao-ling, CHEN Jian-chi, KONG Wei-wen, LI Hua-ping.
2012.
Curent Situation of “Candidatus Liberibacter asiaticus” in Guangdong, China, Where Citrus Huanglongbing Was First Described. Journal of Integrative Agriculture, 12(3): 424-429.
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