title: Susceptibility of the horn fly, Haematobia irritans irritans (Diptera: Muscidae), to insecticides in Brazil.
abstract: Since horn fly populations became established throughout Brazil, complaints regarding control failure have increased around the country. A broad survey to evaluate the susceptibility of horn flies to both organophosphate (OP) and pyrethroid insecticides was conducted from October 2000 to April 2003. Bioassays using filter papers impregnated with cypermethrin, permethrin or diazinon were conducted on 154 horn fly populations in 14 states and 78 municipalities. Resistance to cypermethrin, the active ingredient present in most insecticide products for horn fly control in Brazil, was detected in 98.46% of the populations, with resistance ratios (RR) ranging from 2.5 to 719.9. Resistance to permethrin (RRs < 6.3) was found in 96.67% of the populations, despite its lack of use. In general, pyrethroid resistance was detected in 97.18% of the horn fly populations, with frequencies greater than 87% in all regions of the country. The status of susceptibility of horn fly populations in Brazil to insecticides can be characterized by high susceptibility to OPs and widespread resistance to pyrethroids, potentially compromising the efficacy of pyrethroid products in most cases. Although some partial results have previously been presented, a general picture of horn fly susceptibility in Brazil is presented here for the first time.
authors: Embrapa Pantanal, Empresa Brasileira de Pesquisa Agropecuária, Rua 21 de Setembro 1880, Corumbá, MS, Brazil. thadeu@cpap.embrapa.br
authors: Antonio Thadeu Medeiros
authors: AT
authors: Barros
authors: Thelma Maria
authors: TM
authors: Saueressig
authors: Alberto
authors: A
authors: Gomes
authors: Wilson Werner
authors: WW
authors: Koller
authors: John
authors: J
authors: Furlong
authors: Eneide Santiago
authors: ES
authors: Girão
authors: Alfredo da Cunha
authors: Ada C
authors: Pinheiro
authors: Francisco de Paula Jardim
authors: Fde P
authors: Alves-Branco
authors: Maria de Fátima Munhós
authors: Mde F
authors: Sapper
authors: Ramayana Menezes
authors: RM
authors: Braga
authors: Amaury Apolonio de
authors: AA
authors: Oliveira
mesh_terms: D000818:Animals; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D009117:Muscidae / Q000187:drug effects*
chemical_list: D007306:Insecticides