Development of amitraz resistance in field populations of Boophilus microplus (Acari: Ixodidae) undergoing typical amitraz exposure in the Mexican tropics.
Vet Parasitol
; 152(3-4): 349-53, 2008 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-18242859
ABSTRACT
The purpose of this study was to determine the effect of amitraz selection pressure on the development of resistance in field populations of Boophilus microplus in the Mexican tropics. Three farms (FA(1), FA(2) and FA(3)) in Yucatan, Mexico, were selected in this study. Amitraz was applied as a whole body sprays to all cattle on each farm for tick control once monthly for 15 months. From each farm, 20-30 B. microplus engorged females were collected every 3 months. The modified larval immersion test was used to test susceptibility of B. microplus to amitraz. Larvae were exposed to serial dilutions of amitraz. Probit analysis was used to determine lethal dose at 50% mortality and associated 95% confidence limits. The resistance factors found in the three farms during the 15 months of amitraz selection pressure were FA(1) (1, 2, 4, 4 and 13), FA(2) (1, 6, 23, 21 and 22) and FA(3) (2, 13, 2, 6 and 6). It is concluded that amitraz selection pressure on field populations of B. microplus increased the resistance level in all populations studied in the Mexican tropics.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Infestações por Carrapato
/
Toluidinas
/
Resistência a Inseticidas
/
Doenças dos Bovinos
/
Ixodidae
/
Inseticidas
Tipo de estudo:
Etiology_studies
/
Risk_factors_studies
Limite:
Animals
País/Região como assunto:
Mexico
Idioma:
En
Revista:
Vet Parasitol
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
México