Tuesday, December 12, 2006 - 10:05 AM

Economic impact studies on the northern fowl mite, Ornithonyssus sylviarum, in Southern California caged laying hens

Bradley A. Mullens, mullens@mail.ucr.edu1, Jeb P. Owen, jebpowen@yahoo.com1, and D. R. Kuney, drkuney@ucdavis.edu2. (1) University of California, Department of Entomology, Riverside, CA, (2) University of California, Cooperative Extension, Highlander Hall-C142, Riverside, CA

Northern fowl mite populations were monitored and manipulated by selective pesticide application on a large commercial caged layer operation, and some supplemental studies were done in smaller university flocks. Mite numbers, hen body and egg weights, egg numbers, and feed conversion efficiency were documented. Mite infestations significantly affected hen-day production and profits via reductions in feed conversion efficiency and egg mass. Further detailed studies are planned in university flocks.

Species 1: Acari Macronyssidae Ornithonyssus sylviarum (northern fowl mite)