New World Screwworm
New World screwworm is a harmful fly whose larvae feed on the living tissue of warm-blooded animals by infesting open wounds, potentially causing serious injury or death if untreated. In response to increased screwworm activity in Mexico, the Arizona Livestock Incident Response Team (ALIRT) is leading efforts to detect the pest and protect Arizona's livestock.
Sampling kits for ranchers
Get your free sampling kit and instructions on how to send possible New World screwworm larvae to labs for testing.
Preventative measures
Learn the steps you can take to protect your animals and your business from New World screwworm.
Track reported case locations
USDA and partnering organization information on the location and status of confirmed cases.
New World screwworm basics
Extension experts outline how to protect your livestock from screwworm by checking wounds often, treating wounds quickly and reporting suspected cases using sampling kits.
Extension support for ranchers
The Arizona Livestock Incident Response Team (ALIRT) is providing early detection kits and on the ground support to ranchers across Arizona.