Avaliação da Deltametria para o controle da malaria em áreas de garimpo

Abstract

Residual action experiments were carried out of deltamethrin FW compared with DDT in an experimental área (Maruanum) and goldmining areas of Amapá. state, analysing the following parameters: (1) insecticide residual capacity (measured by the biological assays on walls); (2) insecticide interactions with raffia (a sinthetic f iber tissue) and tvsarrapilhal(lj ute tissue) substracts; (3) treatment action on anopheline density control (measured by twelve hours in indoors and four hours outdoors and indoors collections); (4) sensibility response to insecticide action and (5) Anopheles behaviour aspects. The results show that the insecticides provoked impact on the anopheline population, especially noted in the week immediately after to its application. The percent reduction (R) rates, the anopheline densities indoors and outdoors, as well as the DAYS X INSECTICIDES interation correlation coefficients, indicated the deltamethrin FW and DDT repulsive effect, being more accentuated way for deltamethrin FW. Considering the species, the four and twelve hours collecting data demonstrated a repulsive treatment for A. d a r l i n g i . The A. darlingi antropophily and endophily characters were shown for the SPECIES X MODALITY (man/wall and in/outdoors) correlation coefficients. The biological wall assay realized in the two studied areas showed the high deltamethrin FW residual action, extended over a period of 240 days after treatrnent. In Mhruanum the experiments showed a more accentuated residual action on the superior portion of the wall, than on the inferior, as the latter is more exposed to the weather conditions. The mortality measurements at the goldmining areas, considering the side exposed to the sun ("face AIf) and the opposite side ("face Bw) at the moment of the experiment, showed a anophelines mortality increasing on side B for the two insecticides. The SPECIES X INSECTICIDES interaction statistical tests attained from both of the biological assays areas, indicated a higher mortality ocurring on the raffia better than on the "sarrapilhaW, showing that raffia is an excellent material for the construction of the goldmining área residences (huts) .