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Article history: Received on: 04/04/2016 Revised on: 28/04/2016 Accepted on: 15/05/2016 Available online: 26/08/2016 Ticks (Boophilus sp) are one of the main problems that affect theperformance of bovine production in tropic and sub-tropical. Organophosphate acaricides are the usual tick control method,however the ecological damage and cross-resistanceto those acaricides isleading to the search for alternatives. Beauveria bassiana can be used as a biological control, however, laboratory bioassays with ticks showed mortality of 20 to 50% only. The aim of this investigation was to study the effect of five strains of Beauveria sp, two conidial concentrations and three immersion times on mortality rate of ticks. Five strains of Beauveria sp isolated in México were used and cultivated in liquid medium until 10 7 and 10 8 conidia/mL were obtained. For in vitro bioassays, ticks were collected from bovine, immersed in conidial suspensions for 20, 30 and 40 seconds. Mortality rate was recorded daily up to 10 days.Strain type was the main factor and 23-D Beauveriastrain hadthe highest value (100%) of mortality rate after ten days of incubation with ticks. The best immersion time was 20 s and the bestconidial concentration was 10 8 conidial/ml. In conclusion, native Beauveria sp strains could be an alternative viable for ticks control in bovine, however field test and Beauveria identification are necessary.

Evaluation of Beauveria sp strains, conidial concentration and immersion times on mortality rate of bovine tick (Boophilus sp).