Fifty naturally lice-infested yearling heifers were used in a lice control trial which compared efficacy of four insecticides. The cattle were infested with Bovicola (Damalinia) bovis (L). Linognathus vituli (L). and Solenopotes capillatus (Enderlein). Cattle were assigned to treatment by restricted randomization based on total number of lice counted at five locations on each animal. The animal with the highest number of lice was assigned to Treatment I, the next highest to Treatment II, and this process was repeated until all animals were assigned. Each of the five groups contained 10 calves. The groups were treated as follows: 1) 5% diflubenzuron + 5% permethrin at a rate of 3.0 ml/100 lb. body weight; 2) Eprinex ® applied at 1 ml/22 lb. body wt. rate; 3) Cydectin® applied at 1 ml/22 lb. body weight; 4) Permectrin CD5 ® applied at 2.0 ml/100 lb. body weight; and 5) untreated. Post-treatment lice counts were made at 14, 28, 42 and 56 days. All four insecticides provided lice control of 99% + throughout the 56-day trial. Lice numbers on the untreated cattle increased slightly for the first two counting dates, then declined by 20% by the 56-day counting date.
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA