The larvicidal activity of a botanical insecticide, Biostop Moustiques ® (BM), was studied on field collected larvae of Anopheles gambiae s.l at the concentrations of 1, 5, 10 and 20 mL/L of water. The samples were made based on three different localities of Togo: Lomé, Kovié and Kolokopé. BM had high mortality rates at 20 mL/L in all instars larvae. Specifically, significant high mortality rates were recorded in L3 and L4 from field collected strain at a very low concentration (1 mL/L), compared to laboratory strain. In general, this study showed that the botanical insecticide tested has almost the same larvicidal effect no matter the strains of Anopheles gambiae used.
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