Lamothe ND, Hidalgo FY, Marquetti FMC

Language: Spanish
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Page: 1-11
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ABSTRACT

Introduction: control of malaria vectors in Angola is mainly based on antilarval combat with Bactivec® (Bacillus thuringiensis) and Griselesf® (Bacillus sphaericus).
Objective: evaluate the effectiveness and residuality of the use of biolarvicides against larval populations of Anopheles sp. in Angola.
Methods: all the breeding sites selected in the municipality of Luanda were treated with B. thuringiensis and B. sphaericus and checked for mosquito larvae 7, 15, 21 and 30 days after treatment. Applications were repeated monthly for five months (August to December 2014).
Results: the percentage of breeding sites with larvae 21 days after application ranged between 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 application ranged between 98 % and 100 %. Anopheles sp. were found in 136 breeding sites throughout the study period, mainly in flooded houses and backyards and drainage ditches, and were classified into 13 different types. Residuality in breeding sites averaged 20.2 days.
Conclusions: it was demonstrated that biolarvicides are effective to reduce larval populations of Anopheles sp. It is therefore recommended to combine them with conventional adulticidal methods such as the use of impregnated mosquito nets and residual home spraying to obtain better results in the struggle to reduce malaria in Angola.