Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (3): 464-469.DOI: 10.3969/j.issn.1004-1524.2021.03.11

• Plant Protection • Previous Articles     Next Articles

Distribution and growth dynamics of Candidatus Liberibacter asiaticus positive Asian citrus psyllid in Zhejiang Province

MENG Youqing1, WANG Enguo2, CHEN Wujian3, LI Yanmin1, CHENG Fan3, MENG Minxia4   

  1. 1. Zhejiang Plant Protection and Quarantine and Pesticide Management Station, Hangzhou 310020, China
    2. Agro-Tech Extension Center of Linhai City, Linhai 317000, China
    3. Zhejiang Academy of Science & Technology for Inspection & Quarantine, Hangzhou 310016, China;
    4. Bureau of Agriculture and Rural Affairs of Zhuji City, Zhuji 311800, China
  • Received:2020-07-21 Online:2021-04-02 Published:2021-03-25

Abstract:

Asian citrus psyllid (Diaphorina citri Kuwayama) is the main vector of Candidatus Liberibacter asiaticus(CLas), the pathogen of Huanglongbing (HLB) in China. In order to reveal the distribution characteristics and growth dynamics of CLas in Asian citrus psyllid, and propose suitable time for pest control and disease prevention, 1 662 samples of Asian citrus psyllid and 2 900 samples of HLB were collected from orchards in 24 counties (cities and districts) from 2002 to 2019, according to the distribution characteristics of citrus orchards in Zhejiang Province. The quantity and positive rate of CLas were detected by quantitative PCR. It was shown that there was linear relationship within CLas amount and latitude, longitude, respectively. It was calculated that the north and west boundary for CLas distribution was 29.20°N and 119.80°E in Zhejiang Province. The positive rate of CLas in Zhejiang orchards increased with the elevated HLB incidence rate, and their relationship fitted the Logistic model. The monthly dynamics of CLas in Zhejiang orchards exhibited 3 peaks in April, July and December, respectively, while the annual dynamics fitted conic curves, and reached the peak in 2010. Based on these findings, it was suggested that early spring, summer and autumn were the best time for HLB prevention and control.

Key words: Asian citrus psyllid, distribution characteristics, growth dynamic, Zhejiang Province

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