Field assay with Bactivec® (Bacillus thuringiensis) and Griselesf® (Bacillus sphaericus) in breeding sites of Anopheles sp. from Luanda, Angola

[摘要] Introduction:control of malaria vectors in Angola is mainly based on antilarval combat withBactivec® (Bacillus thuringiensis) and Griselesf®(Bacillus sphaericus).Objective:evaluate the effectiveness and residuality of the use of biolarvicides againstlarval populations of Anopheles sp. in Angola.Methods:all the breeding sites selected in the municipality of Luanda were treated withB. thuringiensis and B. sphaericus and checked for mosquito larvae7, 15, 21 and 30 days after treatment. Applications were repeated monthly forfive months (August to December 2014).Results:the percentage of breeding sites with larvae 21 days after application rangedbetween 39.2 % and 43 % during the study period, with an increase of 50.4 %to 78.1 % at 30 days. Effectiveness of the treatment 24 and 48 hours after applicationranged between 98 % and 100 %. Anopheles sp. were found in 136 breedingsites throughout the study period, mainly in flooded houses and backyards anddrainage ditches, and were classified into 13 different types. Residuality inbreeding sites averaged 20.2 days.Conclusions: it was demonstrated that biolarvicides are effective to reduce larval populationsof Anopheles sp. It is therefore recommended to combine them with conventionaladulticidal methods such as the use of impregnated mosquito nets and residualhome spraying to obtain better results in the struggle to reduce malaria inAngola.

[学科分类] 传染病学

[关键词] biolarvicides;Anopheles sp.;effectiveness;residuality;Angola.