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O presente trabalho objetivou avaliar a ação dos isolados JAB 07, CB 7 e AM 9 do fungo Beauveria bassiana para ovos, larvas e ninfas ingurgitadas de Rhipicephalus sanguineus. Padronizou-se a concentração de 109 conídios mL-1 para cada isolado e por meio de diluições seriadas, obtiveram-se as suspensões com concentrações de 10(8) e 10(7)con. mL-1. Preparou-se um bioensaio para cada fase do ciclo de vida do carrapato. Cada ensaio foi composto por 10 grupos tratamentos, formados por um isolado do fungo e uma concentração de conídios, e um grupo controle contendo apenas o veículo das suspensões. Os isolados do fungo, aplicados nas diferentes concentrações de esporos, causaram redução no percentual de eclosão de larvas oriundas de ovos infectados (0,7 a 12,1% de eclosão) e no percentual de ecdise de larvas (4,7 a 33,7% de ecdise) e ninfas (0 a 16,7% de ecdise). Não houve diferença entre os isolados (P>0,05) quanto à infecção de ovos, mas a aplicação de 109 con./mL de JAB 07 e AM 9 promoveu redução significativa da eclosão de larvas, em relação à concentração de 10(7)con. mL-1. O isolado CB 7 foi o mais eficaz na redução do número de ecdises de larvas. Os isolados e as concentrações de conídios não diferiram (P>0,05) quanto à capacidade de redução do percentual de ecdise de ninfas, mas evidenciou-se intensa atividade patogênica do fungo.The aim of the present study was to determine the action of isolates JAB 07, CB 7 and AM 9 of the fungus Beauveria bassiana on eggs, larvae and engorged nymphs of Rhipicephalus sanguineus tick. A concentration of 109 conidia mL-1 was standardized for each isolate and suspensions containing 10(8) and 10(7) conidia mL-1 were obtained by serial dilution. A bioassay was prepared for each phase of the life cycle of the tick. Each assay comprised 10 treatment groups, consisting of one fungal isolate and one conidial concentration, and one control group containing only the vehicle of suspensions. For the eggs infection 0.1g (about 270 eggs) were placed at 1ml of suspension at different concentrations, each engorged larvae group (n=250) and engorged nymphs (n=50) received 2ml of one conidial suspension. Thereafter, eggs, larvae and nymphs were placed in on incubator at 27 ± 1°C and at a humidity above 80%. The fungal isolates applied at different spore concentrations caused a reduction in percent hatching of larvae derived from infected eggs (0.7 to 12.1% of hatching) and in percent ecdysis of larvae (4.7 to 33.7% of ecdysis) and nymphs (0 to 16.7% of ecdysis). No difference in the infection of eggs was observed between isolates (P>0.05), but the application of 109 conidia/ml of JAB 07 and AM 9 significantly reduced the hatching of larvae compared to the concentrations of 10(7) conidia mL-1. The isolate CB 7 was more efficient in reducing the number of larval ecdysis. The isolates and concentrations tested didn t differ (P>0.05) in their ability to reduce percent ecdysis of nymphs, but an intense pathogenic activity of the fungus was observed

Patogenicidade de isolados de Beauveria bassiana para ovos, larvas e ninfas ingurgitadas de Rhipicephalus sanguineus