Resistance to synthetic pyrethroid pour-on insecticides in strains of the sheep body louse Bovicola (Damalinia) ovis.
Aust Vet J
; 69(9): 213-7, 1992 Sep.
Article
en En
| MEDLINE
| ID: mdl-1449456
ABSTRACT
Groups of sheep infested with strains of Bovicola (Damalinia) ovis were obtained from flocks either with a history of failure to control lice with synthetic pyrethroid (SP) pour-on insecticides, or from farms where SP compounds were not used. The sheep were treated according to the manufacturer's recommendations with registered "off-shears" SP formulations. All treatments were applied under ideal conditions with doses calculated on an individual body weight basis and applied to the dorsal mid-line from the base of the neck to the butt of the tail. Treated sheep were kept in pens and maintained in separate groups. The pour-on SP treatments significantly reduced the lice population but failed to eliminate the infestation in 7 of 13 experiments in sheep carrying strains of lice with resistance factors of greater than 4 to at least one of the SP compounds. Failures occurred with all three of the SP pour-ons currently registered for lice control in NSW and with both water-based and organic solvent-based formulations.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Infestaciones por Piojos
/
Piretrinas
/
Enfermedades de las Ovejas
/
Insecticidas
/
Phthiraptera
Tipo de estudio:
Guideline
Límite:
Animals
Idioma:
En
Revista:
Aust Vet J
Año:
1992
Tipo del documento:
Article