title: The prevalence of lice (Bovicola ovis) infested sheep flocks in Western Australia (1987-1993)
abstract: The proportion of wool bale brands with a positive test for sheep lice in baled wool decreased from 29.5% in 1987/88 to 23.2% in 1990/91 before increasing to 38.2% in 1992/93. Changes in the proportion of wool bale brands with a positive test for lice were highly correlated with changes in the Wool Market Price Indicator. The increase in the proportion of positive lice tests since 1990/91 was associated with an increase in failures to eradicate lice from flocks. These failures were partly a consequence of the reduced use of lousicidal treatments, the development of resistance to synthetic pyrethroid chemicals and an increase in the transmission of lice between flocks.
authors.affiliation: Department of Agriculture, South Perth, Western Australia.
authors.forename: P W
authors.initials: PW
authors.lastname: Morcombe
authors.forename: N D
authors.initials: ND
authors.lastname: Thomson
authors.forename: P G
authors.initials: PG
authors.lastname: Buckman
mesh_terms: D000818:Animals; D007306:Insecticides / Q000627:therapeutic use; D010373:Lice Infestations / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary*; D015995:Prevalence; D012044:Regression Analysis; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology* / Q000517:prevention & control; D014904:Western Australia / Q000453:epidemiology; D014935:Wool / Q000191:economics / Q000469:parasitology*
chemical_list: D007306:Insecticides