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Biological Control
Vol. 63, No.
2, 2012; Pages: 98 - 101

Laboratory evaluation of virulence of Chinese Beauveria bassiana and Metarhizium anisopliae isolates to engorged female Rhipicephalus (Boophilus) microplus ticks

Qiaoyun Ren, Zhijie Liu, Guiquan Guan, Ming Sun, Miling Ma, Qingli Niu, Youquan Li, Aihong Liu, Junlong Liu, Jifei Yang, Hong Yin, Jianxun Luo

State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Key Laboratory of Grazing Animal Diseases MOA, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Science, Xujiaping 1, Lanzhou, Gansu 730046, PR China.


Rhipicephalus (Boophilus) microplus, an important ectoparasite that can transmit Babesia and Anaplasma, has caused inestimable economic losses around the world. Traditionally, acaricides are used for the control of ticks. However, drawbacks of chemical control, such as resistance, environmental pollution, and traces in food promote alternative strategies to pesticides. Microbial control is one option to reduce tick populations. In this study, we investigated the pathogenicity of thirteen Beauveria bassiana isolates and seven Metarhizium anisopliae isolates to the engorged female R. (B.) microplus ticks using different conidial concentrations of 107, 108 and 109 conidia mL–1. Fourteen days after treatment, three B. bassiana isolates (B.bAT01, B.bAT03, B.bAT13) and one M. anisopliae isolate (M.aAT04) resulted in 100% mortality of engorged female ticks with conidial concentrations of 108 and 109 conidia mL–1. Isolates of B.bAT01, B.bAT03, B.bAT13 and M.aAT04 at all conidial concentrations could reduce the reproductive efficiency index (REI) of R. (B.) microplus ticks.

Keywords:Rhipicephalus (Boophilus) microplus; Beauveria bassiana; Metarhizium anisopliae; Biological control; Entomopathogenic fungi



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