Horn fly resistance to pyrethroids
Lorry L. Dunning, University of California
Walter H. Johnson
Ronald S. Knight
Edmond C. Loomis
Neil K. McDougald
P. Dean Smith
Charles B. Wilson
California Agriculture 40(9):8-10. DOI: 10.3733/ca.v040n09p8.
Lorry L. Dunning is Staff Research Associate, Veterinary Medicine Extension, University of California, Davis; Walter H. Johnson is County Director, Shasta County; Ronald S. Knight is County Director, Tehama County; Edmond C. Loomis is Parasitologist, Cooperative Extension, UC Davis; Neil K. McDougald is Livestock Farm Advisor, Madera County; P. Dean Smith is County Director, Inyo/Mono counties; Charles B. Wilson is Livestock Farm Advisor, Sutter/Yuba counties.
Varying levels of resistance to pyrethroid cattle ear devices have been found in northern California.
The authors are grateful to the following, who assisted in the field tests: cattlemen in the various counties for use of their cattle and facilities; N. Martin, Staff Research Associate, UC Sierra Foothill Range Field Station; C. Paddock, R. Suther and C. Roudebush, Laboratory Assistants, Extension Veterinary Medicine, UC Davis. The authors also wish to acknowledge the assistance of G.P. Georghiou, Professor of Entomology, UC Riverside, and S.E. Kuntz, Research Leader, USDA Livestock Insects Laboratory, Kerrville, TX.