Analysis of toxicity on Bacillus sphaericus from amazonian soils to Anopheles darlingi and Culex quinquefasciatus larvae

Acta Amazonica

Eleilza De Castro Litaiff²  Wanderli Pedro Tadei¹  Jorge Ivan Rebelo Porto¹  Ila Maria De Aguiar Oliveira¹ 

[1] ,Instituto Nacional de Pesquisas da Amazônia Coordenação de Ciências da Saúde Laboratório de Vetores de Malária e DengueManaus AM ,Brasil

关键词: Vector control;    Bioassays;    Biolarvicides;    Amazonian;    Entomopathogens;    Controle de vetores;    Bioesnasios;    Biolarvicidas;    Amazônia;    Entomopatógenos;   

DOI  :  10.1590/S0044-59672008000200008

来源: SciELO

【 摘 要 】

Bioassays under laboratory conditions aiming to determine the larvicidal activity of Bacillus sphaericus were carried out on Anopheles darlingi and Culex quinquefasciatus. In order to estimate the toxicity through median lethal concentration (LC50) and the relative potency of the strains to B. sphaericus standard strain 2362, probit analysis was performed utilizing the POLO-PC program. The findings of LC50 pointed out high effectiveness on strains IB15 (0.040 ppm), IB19 and S1116 (0.048 ppm), IB16 (0.052 ppm) and S265 (0.057 ppm). Strain IB15 presented nearly 50% more potency than strain 2362 in bioassays conducted on A. darlingi. It was observed that IB16 and S1116 strains were the most powerful against C. quinquefasciatus, showing to be about 300-400% stronger than 2362 strain. The results show that laboratory conditioned evaluation can be an important way to select promising bacteria with entomopathogenic action on biolarvicides production for use on mosquitoes breeding sites.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License