Acaricidal potential of Beauveria bassiana (Balsamo-Crivelli) Vuillemin and Metarhiziun anisopliae (Metschnikoff) on the tick (Rhipicephalus microplus Canestrini) (Acari:Ixodidae), in Nicaragua
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Abstract
Context: The cattle tick Rhipicephalus microplus causes significant productivity and competitiveness losses in the Nicaraguan livestock sector. Producers primarily use synthetic chemical pesticides to control R. microplus. An alternative to these pesticides and their associated problems is biological control. In this regard, the effectiveness of strains of Beauveria bassiana and Metarhizium anisopliae against ticks has been evaluated.
Objective: This study aimed to determine the acaricidal effect of different B. bassiana and M. anisopliae strain concentrations on R. microplus mortality and reproductive parameters under laboratory conditions.
Methods: The bioassay was conducted in the agrobiotechnology laboratory of the Instituto Nicaragüense de Tecnología Agropecuaria. Adult R. microplus were collected from farms in Matagalpa for the study. A completely randomized design was used under laboratory conditions. The treatments evaluated were engorged ticks with different concentrations of B. bassiana and M. anisopliae.
Results: This study found that B. bassiana and M. anisopliae have acaricidal potential against ticks. A mixture of B. bassiana and M. anisopliae at concentrations of 1x10⁸ and 1x10⁹ caused higher tick mortality in less time than either alone. The mixture also decreased the nutrition index and inhibited the reproductive efficiency of ticks.
Conclusions: These results suggest the possibility of incorporating entomopathogenic fungi into an integrated tick management program for cattle on a national scale.
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