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■Bio-mathematics, Statistics and Nano-Technologies: Mosquito Control Strategies

Each BR-OVT adhesive was treated with 2 g of the biolarvicide VectoBac G, based on

Bacillus thurigiensis var. israelensi. Every 30 days the adhesive edges and the oviposition

substrate for Ae. aegypti were replaced. The rafts of Culex pipiens sl. Were retrieved once

a week and counted. All mosquitos captured on adhesive edges and ovipositor substrates

were taken to the laboratory of the Tropical Disease Research Group at the Jean Piaget

University in Cabo Verde, for identification and quantification.

18.4.3

Results

During the study period in Praia and Assomada, 382 adult mosquitos were collected,

belonging to the species Cx. pipiens s.l. and Ae. aegypti. Of these, about 90% were captured

in Praia. During the same study period, 207 rafts (Culex eggs) were also collected, the

majority (88%) in the city of Praia. In Praia, from the total number of mosquitos captured,

72% classified as Cx. pipiens s.l. and the rest as Ae. aegypti. Mosquito densities obtained in

the two months showed little variation when compared. However, for egg collection, these

traps presented results opposite to those described in Brazil: the positivity for Aedes eggs

was higher than for Culex eggs (rafts), with positivity of 96% and 40% for the respective

species. In Assomada, the collection of adult mosquitos in adhesive BR-OVT was lower

than in Praia and about 50% of these traps were positive for adult mosquitos, in both

months. As in Praia, mosquito densities showed little monthly variation. However, of the

total number of mosquitos collected, there was a greater presence of Ae. aegypti (60%)

captured over Cx. pipiens s.l. (40%). As for the presence of eggs, the positivity of adhesive

BR-OVT was 75% for Aedes, and 25% for Culex (18.5).

Figure 18.5: Percentage of positivity of the BR-OVT trap for Aedes and Culex eggs, per

month, in the cities of Praia and Assomada during July and August 2014.