Zinc phosphide is federally registered for vole or field mouse control. It usually is a Restricted Use pesticide that may be purchased and used by Certified pesticide Applicators only. Contact your local extension agent for information on becoming a Certified pesticide Applicator. Some formulations of zinc phosphide are packaged in small containers and are registered as General Use pesticides. These may be purchased and used by the general public.
Zinc phosphide is available in formulated pellets or treated grain.
Toxic bait may be applied by hand in spot treatments by placing bait in runways or burrow openings. Hand-baiting is the only application method that can be used in urban areas such as lawns, ornamental plantings, parks and golf courses. Toxic bait also may be broadcast-applied according to label directions. Broadcasting will increase the amount of bait applied per acre and the hazard to non-target wildlife. Use of toxic bait is most appropriate in young woody plantings or orchards, when habitat reduction efforts have failed to keep vole populations in control.