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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/21846

Title: Susceptibility to diazinon in populations of the horn fly, Haematobia irritans (Diptera: Muscidae), in Central Brazil
Authors: Barros, Antonio Thadeu M.
Gomes, Alberto
Ismael, Ana Paula K.
Koller, Wilson W.
Keywords: horn flies - insecticide - organophosphate - resistance - Centtral Brazil
Issue Date: 31-Dec-2002
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 97 Num 6
Abstract: 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.
URI: http://hdl.handle.net/1807/21846
Other Identifiers: http://www.bioline.org.br/abstract?id=oc02174
Rights: Copyright 2002 - Instituto Oswaldo Cruz - Fiocruz
Appears in Collections:Bioline International Legacy Collection

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