Mechanisms of pyrethroid resistance inHaematobia irritans (Muscidae) from Mato Grosso do Sul state, Brazil

Horn fly resistance to pyrethroid insecticides occurs throughout Brazil, but knowledge about the involved mechanisms is still in an incipient stage. This survey was aimed to identify the mechanisms of horn fly resistance to cypermethrin in Mato Grosso do Sul state, Brazil. Impregnated filter paper b...

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Published in:Revista brasileira de parasitologia veterinaria 2013-03, Vol.22 (1), p.136-142
Main Authors: Barros, Antonio Thadeu Medeiros, Schumaker, Teresinha Tizu Sato, Koller, Wilson Werner, Klafke, Guilherme Marcondes, Albuquerque, Thais Aguiar de, Gonzalez, Rodrigo
Format: Article
Language:English
Subjects:
Horn fly
insecticide resistance
kdr
metabolic resistance
PARASITOLOGY
VETERINARY SCIENCES
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Summary:Horn fly resistance to pyrethroid insecticides occurs throughout Brazil, but knowledge about the involved mechanisms is still in an incipient stage. This survey was aimed to identify the mechanisms of horn fly resistance to cypermethrin in Mato Grosso do Sul state, Brazil. Impregnated filter paper bioassays using cypermethrin, synergized or not with piperonyl butoxide (PBO) and triphenyl phosphate (TPP), were conducted from March 2004 to June 2005 in horn fly populations (n = 33) from all over the state. All populations were highly resistant to cypermethrin, with resistance factors (RF) ranging from 89.4 to 1,020.6. Polymerase chain reaction (PCR) assays to detect the knockdown resistance (kdr) mutation also were performed in 16 samples. The kdr mutation was found in 75% of the tested populations, mostly with relatively low frequencies (
ISSN:1984-2961
1984-2961
DOI:10.1590/S1984-29612013005000016