Morcombe P W, Thomson N D, Buckman P G
Department of Agriculture, South Perth, Western Australia.
Aust Vet J. 1994 Mar;71(3):71-4. doi: 10.1111/j.1751-0813.1994.tb03330.x.
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.
成包羊毛中检测出绵羊虱呈阳性的羊毛包品牌比例，从1987/88年度的29.5%降至1990/91年度的23.2%，随后在1992/93年度又增至38.2%。成包羊毛中虱子检测呈阳性的比例变化与羊毛市场价格指数的变化高度相关。自1990/91年度以来，虱子检测呈阳性的比例增加与羊群中虱子根除失败率上升有关。这些失败部分是由于杀虱处理的使用减少、对合成拟除虫菊酯类化学品产生抗药性以及羊群间虱子传播增加所致。
