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Parasitología al día

versão impressa ISSN 0716-0720

Resumo

BITTENCOURT, VANIAR.E.P; CASTRO RODRIGUES DE MENEZES, GABRIELE; MASCARENHAS, ANDRÉA G.  e  MONTEIRO, E SILVIA G.. ACTIONS OF FUNGUS Beauveria bassiana AND Metarhizium anisopliae ON LARVAE OF THE TICK Anocentor nitens. Parasitol. día [online]. 1999, vol.23, n.3-4, pp.82-86. ISSN 0716-0720.  http://dx.doi.org/10.4067/S0716-07201999000300003.

The pathogenicity of isolates Ma959, MaE9, Ma319 from Metarhizium anisopliae and isolate Bb747 from Beauveria bassiana was evaluated using Anocentor nitens larvae under controlled conditions. Four suspensions with different concentrations (108, 107, 106 and 105 conidia/ml) were tested for evaluating the percentage of larvae mortality ten days after the infection and the probit analysis was realized. The mortality average of larvae in treated groups with the isolate Ma959 alternate between 80.8% and 10.2%. The use of isolate Ma319 showed almost 100% of mortality for the 108 conidia/ml concentration. The isolate MaE9 showed the best results of mortality in 108 and 107 concentration. The mortality of the groups treated with Bb747 alternate between 3.6% (105 conidia/ml) to 97.4% (108 conidia/ml). The LC 50 were 1.6 x 106; 1.2 x 106; 1.6 x 107 e 1.8 x 106 for the isolates Ma319, MaE9, Ma959 e Bb747, respectively. The results reveal a susceptibility of Anocentor nitens larvae to these fungus and prove their potential use in integrate control programs.

Palavras-chave : Beauveria bassiana; Metarhizium anisopliae; Anocentor nitens; biological control; ticks; entomopathogenic fungus.

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