294

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

eggs were carried out, since October 2020, to conduct the bioassays at one, three, six and

twelve months after painting the surfaces with insecticidal paints.

Substrate: Glazed ceramic (non-porous surface) and cement block (porous surface). In-

secticidal Paints: Polymeric microencapsulated suspension of insecticides. Two paints car-

rying organophosphate compounds (5A IGR and ARES) and one carrying pyrethroids

(VESTA), from Inesfly Corporation.

Method: WHO cone bioassay, corresponding to that defined by World Health Organization

in WHO methodological guide for adulticides against mosquitos used in indoor spraying

[36].

18.5.3

Results and discussion

Females from populations of Ae. aegypti from cidade da Praia, Cabo Verde, show vari-

ations in the mortality and delayed mortality rates according to: the type of paint tested,

the type of substrate painted and the period of time since they were painted. Figure 18.6

shows, in percentage, the delayed (24 h) mortality for Ae. aegypti in bioassays performed

at one, three, six and twelve months after the surfaces were painted, for the three tested

paints.

The low mortality observed, after 24 hours, in the bioassays carried out for the 5A IGR

and ARES paints show the resistance to organophosphate insecticides of the populations

of Ae. aegypti from the city of Praia, Cabo Verde.

Figure 18.6: Mortality, at 24 h, of Ae. aegypti on porous and non-porous surfaces painted

with insecticidal paints (P (Porous surface), NP (Non-porous surface).