The Control of Anopheline Mosquitos by the Spraying of Deltamethrin on Raffia Curtains Used in Miners' Huts in Areas Endemic for Malaria

Abstract

The residual potential of an aqueous solution of Deltamethrin (FW 25 mg i.a./m) was evaluated on raffia curtains. These are sheets of synthetic material used in the construction of huts to house miners. Experiments were conducted during 420 days and the curtains were always rolled up in the daytime and unrolled in late afternoon. Data analyzed by logarithmic regression indicated that raffia treated with Deltamethrin had higher mortality indices than that covered with DDT. The residual capacity of Deltamethrin on raffia was high. The mortality percentage was above 85% after 360 days and dropped to about 50% at 420 days. The effect of DDT was reduced after 180 days and reached zero by the end of the experiment. Based or the results of these experiments, it is recommended that Deltamethrin be used to spray raffia curtains in mining regions and other areas that are endemic for malaria.

Adaptative processes, control measures, genetic background, and resilience of malaria vectors and environmental changes in the Amazon region

“…It is also relevant to consider the efficacy of control measures related to the protection of the population provided by the use of screens on doors and windows of homes and insecticide-impregnated raffia curtains used in miners huts, as a primary barrier, blocking the entrance of the vector and reducing human/vector contact (Figueiredo et al, 1998). The concomitant use of insecticide-impregnated mosquito nets over beds represents a second protective barrier to contact with the vector (Martins-Campos et al, 2012), ensuring a better quality of life for exposed populations in at-risk areas (Santos et al, 1999).…”