Haemaphysalis qinghaiensis, a prevalent tick species in China, causes severe economic losses. In this study, we investigated the pathogenicity of six isolates of the fungus Metarhizium anisopliae to engorged female H. qinghaiensis using concentrations of 10(6), 10(7) and 10(8) conidia ml(-1). The results indicated that M.aAT08 and M.aAT13 isolates were highly virulent against the ticks. Metarhizium anisopliae has potential for biocontrol of H. qinghaiensis.
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