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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2018年55 No.4

Pathogenicity of Paecilomyces variotii and Beauveria bassiana to Diaphorina citri
Author of the article:SONG Xiao-Bing; PENG Ai-Tian; LING Jin-Feng;CUI Yi-Ping; CHENG Bao-Ping;ZHANG Lian-H
Author's Workplace:Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou 510640, China; Agricultural College of South China Agricultural University, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Guangzhou 510640, China
Key Words:Paecilomyces variotii, Beauveria bassiana, Diaphorina citri, pathogenicity, biocontrol
Abstract:

 [Objectives]  To compare the pathogenicity of Paecilomyces variotii and Beauveria bassiana WS-11 and QB-28 strains to Diaphorina citri adults, and provide theoretical support for the use of these biocontrol agents in the field. [Methods]  The spore fluid immersion method was used to compare the virulence of both kinds of fungi to D. citri adults. A time-dose- mortality model was used to estimate lethal doses and the lethal period of exposure to each fungus. [Results]  The highest concentration of P. variotii caused 90.67% mortality where as B. bassiana caused 97.33% mortality rate on centration of 1×108 spores/mL. The time-dose-mortality model was a good fit to the data and could be used to estimate exposure time and dose effects. The estimated LC50 values after 9 days inoculation with P. variotii or B. bassiana were 7.57×106 spores/mL and 8.39×105 spores/mL, respectively, whereas at a concentration of 1×108 spores/mL LT50 values were 2.50 d and 1.93 d, respectively. [Conclusion]  Both fungi were highly pathogenic to Diaphorina citri adults and consequently should both be considered as potential biological control agents for controlling this pest. The virulence of B. bassiana was higher than that of P. variotii, and it consequently has greater potential as a biological control than P. variotii.

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