THE CONTROL OF ANOPHELINE MOSQUITOS BY THE SPRAYING OF DELTAMETHRIN ON RAFFIA CURTAINS USED IN MINERS' HUTS IN AREAS ENDEMIC FOR MALARIA

• Main Authors: Regina FIGUEIREDO, Wanderli P. TADEI, Bedsy Dutary THATCHER
• Format: Article
• Language: English
• Published: Universidade de São Paulo 1998-03-01
• Series: Revista do Instituto de Medicina Tropical de São Paulo
• Subjects: Malaria; Deltamethrin; Raffia; Anophelines; Mosquito
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0036-46651998000200008
• ISSN: 0036-4665; 1678-9946

The residual potential of an aqueous solution of Deltamethrin (FW 25 mg i.a./m2) 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 on 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.<br>O poder residual da deltametrina FW (25 mg i.a./m2) foi avaliado em cortinas de ráfia tecido sintético, utilizadas na construção das barracas nos garimpos. Foram realizadas provas biológicas de parede, durante 420 dias, sendo as cortinas laterais das barracas enroladas durante o dia e desenroladas no final da tarde. Os dados da regressão logística evidenciaram que a ráfia impregnada com a deltametrina apresenta taxas de mortalidade superiores à tratada com DDT. O poder residual da ráfia/deltametrina mostrou efeito elevado, atingindo índices de mortalidade acima de 85% aos 360 dias, diminuindo em quase 50% aos 420 dias. O efeito do DDT foi reduzido aos 180 dias, chegando a zero de mortalidade ao final do experimento. Mediante o resultado do tratamento dado à ráfia, recomenda-se seu emprego em barracas nos garimpos e áreas endêmicas de malária.