News What to know about New World screwworm flies — and what’s at stake for Texas livestock Experts say the main threat stems not from the adult fly, but its larvae.

The USDA has said the flies have been detected as close as 700 miles from the U.S. border, and some U.S. agriculture and cattle industry officials have worried that if the migration isn't checked ...

USDA combats flesh-eating New World Screwworm by breeding sterilized flies for release over Mexico and Texas, with a new fly factory planned for 2026.