New World Screwworm returns to North America: Implications for Nebraska Livestock Producers
News Staff
Wednesday, June 17, 2026
Lincoln, Neb., June 11, 2026 —The New World Screwworm (NWS), Cochliomyia hominivorax, is among the most destructive livestock pests ever encountered in the Western Hemisphere. Unlike most fly species whose larvae develop in decaying organic matter, New World Screwworm larvae feed exclusively on live tissue of warm-blooded animals.