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      Excito-repellency effect of deltamethrin on triatomines under laboratory conditions Translated title: Efeito excito-repelente da deltametrina sobre triatomíneos em condições de laboratório

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          This work demonstrates that deltamethrin in low doses produces an excito-repellency effect on triatomines, as already observed for mosquitoes. A wooden box covered with a cloth impregnated with deltamethrin at doses of 2.5 and 5mg ai/m² was utilized for the experiment. The triatomine species studied were Triatoma infestans, Panstrongylus megistus, Rhodnius neglectus and Triatoma sordida. Adults were released in one of the sides of the box and their position was noted in subsequent periods. The observations were realized on the day the cloth was impregnated and subsequently repeated at 30 and 60 days for T. sordida; on day 120, the remaining species were included. Insect mortality and attempts at flight from the box were also observed. Excito-repellency was evident for all species and doses up to day 120. The only species that attempted to fly was P. megistus. The excito-repellency effect may be considered as an additional advantage to the insecticide power, as it should be able to prevent the installation of new colonies by females that fly into the homes, and at the moment of the spraying, it should promote the flushing out of triatomines from the wall crevices and from other shelters.

          Translated abstract

          No presente trabalho procurou-se constatar se a deltametrina em baixas doses produz excito-repelência em triatomíneos, conforme já observado para mosquitos. O experimento foi realizado utilizando-se uma caixa de madeira recoberta com tecido impregnado com deltametrina nas doses de 2,5 e 5mg ia/m². As espécies de triatomíneos estudadas foram o T. infestans, P. megistus, R. neglectus e T. sordida. Exemplares adultos eram liberados em um dos lados da caixa, e a posição dos mesmos era anotada em períodos subseqüentes. A experiência foi realizada no dia da impregnação do tecido, e repetida aos 30 e 60 dias para o T. sordida; aos 120 dias incluíram-se as demais espécies. Também foram observadas a mortalidade dos insetos e a tentativa de fuga da caixa através do vôo. A excito-repelência foi evidente para todas as espécies e doses até o 120º dia. A única espécie que voou foi o P. megistus. O efeito excito-repelente pode ser considerado uma vantagem adicional ao poder do inseticida pois dificultaria a instalação de novas colônias a partir de fêmeas que ingressassem nas casas através do vôo, além de promover o desalojamento de exemplares presentes nas frestas das paredes e outros esconderijos.

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          Most cited references 18

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          Control of Chagas disease.

          Chagas disease occurs throughout Mexico and central and southern America and continues to pose a serious threat to health in many countries of the region. People infected with the trypanosome parasite may suffer cardiac, gastrointestinal, or neurological damage, although disease manifestations vary widely from one endemic area to another. In the past decade, control programmes in several endemic countries have proved remarkably successful; interruption of disease transmission has been achieved in some and is imminent in others, leading to a substantial reduction in the incidence of Chagas disease in Latin America. However, 8-9 million people in Mexico and the Andean and central American countries are infected with the parasite and 25 million remain at risk, emphasizing the need to sustain and extend control strategies. This report of a WHO Expert Committee reviews current knowledge of Chagas disease and its pathogenesis, discusses the causative parasite, the triatomine vectors, and the natural reservoirs of infection, and considers the epidemiology and incidence trends of the disease. Prevention and control strategies are described, as are the various formal initiatives for interruption of disease transmission. The report concludes by identifying priorities for research and offering guidance for the planning, implementation, and strengthening of national control programmes.
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              Insecticidal activity of pyrethroids on insects of medical importance.

               Kim E Zerba (1988)
              Pyrethroid insecticides, from natural pyrethrins to photostable analogues, represent important weapons against insect pests of both economic and medical importance. They share many characteristics with DDT, including a negative temperature coefficient, and knockdown and killing activity resulting from action against the sodium channels of the peripheral and central nervous systems. In this review, Eduardo Zerba summarizes what is known about their penetration into target insects, their mode of action, metabolism and excretion.

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                Revista da Sociedade Brasileira de Medicina Tropical
                Rev. Soc. Bras. Med. Trop.
                Sociedade Brasileira de Medicina Tropical - SBMT (Uberaba )
                June 2000
                : 33
                : 3
                : 247-252
                [1 ] Fundação Oswaldo Cruz Brazil
                [2 ] London School of Hygiene and Tropical Medicine United Kingdom
                [3 ] Hoechst Schering AgrEvo do Brasil Ltda Brasil
                Product Information: website
                TROPICAL MEDICINE


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