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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 6, 2002, pp. 905-907
Bioline Code: oc02174
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 6, 2002, pp. 905-907

 en Susceptibility to Diazinon in Populations of the Horn Fly, Haematobia irritans check for this species in other resources (Diptera: Muscidae), in Central Brazil
Antonio Thadeu M Barros; Alberto Gomes; Ana Paula K Ismael & Wilson W Koller


From October 2000 to April 2001, insecticide bioassays were conducted in 18 ranches from 10 counties in the states of Mato Grosso and Mato Grosso do Sul, in Central Brazil. Horn flies from wild populations were exposed to diazinon-impregnated filter papers immediately after collection on cattle, and mortality was recorded after 2 h. A high susceptibility to diazinon was observed in all tested populations. The LC 50 s ranged from 0.15 to 0.64 µg/cm 2, and resistance ratios were always lower than one (ranging 0.1-0.6). Pyrethroid products, most applied by backpack sprayers, have been used since the horn fly entered the region, about 10 years ago. The high susceptibility observed to diazinon indicates that this insecticide (as probably other organophosphate insecticides) represents an useful tool for horn fly control and resistance management, particularly in pyrethroid-resistant populations.

horn flies - insecticide - organophosphate - resistance - Centtral Brazil

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