US Fights Screwworm Fly Threat
Analysis based on 7 articles · First reported Jul 02, 2025 · Last updated Jul 03, 2025
The eradication efforts against the New World Screwworm fly are expected to have a positive impact on the agricultural and livestock markets, particularly the beef industry in the United States and Mexico, by preventing devastating losses. The temporary border closure by the United States on livestock imports from Mexico, however, could cause short-term disruptions for Mexican exporters.
The United States government, primarily through the United States — United States Department of Agriculture (USDA), is initiating a large-scale program to combat the New World Screwworm fly, a flesh-eating maggot that poses a significant threat to the United States' beef industry, wildlife, and household pets. This involves breeding billions of sterile male flies and releasing them over Mexico and southern Texas. The sterile males will mate with wild females, leading to unfertilized eggs and a decline in the fly population. The USDA plans to establish a new fly factory in southern Mexico by July 2026 and a distribution center in southern Texas by the end of the year, investing $8.5 million and $21 million respectively. This method, previously successful in eradicating the pest north of Panama, is considered more effective and environmentally friendly than chemical spraying. The United States temporarily closed its southern border to live cattle, horses, and bison imports in May due to the fly's migration north, with full reopening expected by mid-September.
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