New World Screwworm Texas has arrived — and American livestock producers are on high alert. On June 3, 2026, USDA’s Animal and Plant Health Inspection Service confirmed the detection in Zavala County, South Texas. The parasite had not established itself in the United States in roughly 60 years. Authorities launched an immediate emergency response.
Background on New World Screwworm Texas
Notably, this flesh-eating parasite targets warm-blooded animals including cattle, pets, and wildlife. The fly’s larvae burrow into living tissue through open wounds. Left untreated, animals can die within one week of infestation. USDA eradicated the pest from U.S. soil back in the 1960s using the sterile insect technique. That method releases factory-reared sterile male flies to suppress reproduction. Recent resurgences in Central America put U.S. producers on edge for years.
Key Details of the New World Screwworm Texas Outbreak
Furthermore, the first confirmed case involved a three-week-old calf near La Pryor, Texas, close to the U.S.-Mexico border. Larvae appeared in the animal’s umbilical area. By June 6, USDA confirmed a second case — a one-month-old calf also in Zavala County, approximately 5.6 miles from the first detection. USDA immediately established a 12.5-mile infested zone around the detection area. Officials also imposed quarantines, movement controls, and expanded surveillance across the region.
Industry Impact
Consequently, the detection sent shockwaves across livestock markets. Live cattle futures fell roughly 0.8% Thursday morning as news of the first case spread. Meanwhile, feeder cattle futures surged the daily limit the following day as traders reacted to the confirmed spread. The U.S. beef herd already stands at its smallest point in 75 years. Ground beef hit a record $6.89 per pound in May 2026, the highest since federal tracking began in 1984. Analysts warn a wider outbreak could cost the livestock industry up to $1.8 billion in economic losses. Canada responded swiftly. The Canadian Food Inspection Agency announced temporary import restrictions on livestock from affected U.S. areas. USDA stated it would negotiate with trading partners to regionalize any trade restrictions to defined geographic areas.
What Comes Next for New World Screwworm Texas Response
In addition, USDA confirmed it would not pursue a mass culling strategy, unlike the approach used during the bird flu outbreak. Instead, officials plan to rely on the sterile insect technique that successfully eliminated the pest in the 1960s. The agency currently releases 4 million sterile flies per week by air over the affected area. Moreover, USDA will expedite targeted ground-level sterile fly releases around the confirmed detection zone. Officials urge all producers and residents near Zavala County to inspect livestock and pets immediately. Signs of infestation include draining or enlarging wounds and visible discomfort in animals. Importantly, USDA Secretary Brooke Rollins stressed the parasite does not infest meat, fruits, or vegetables, and poses no threat to the food supply chain.
Conclusion
Therefore, the New World Screwworm Texas confirmation marks a defining biosecurity moment for American agriculture. The U.S. beef industry — already strained by record-high prices, a shrinking national herd, and volatile markets — faces yet another pressure point. However, rapid federal and state coordination, combined with proven eradication tools, gives producers reason for cautious optimism. Every livestock owner in the region must act now. Inspect animals daily, contact local veterinarians immediately upon any sign of infection, and monitor USDA APHIS updates closely. The coming weeks will determine whether this outbreak stays contained — or becomes a national crisis.
Related: New World Screwworm Hits Texas Cattle
Originally reported by USDA APHIS. Analysis by the GardenScoop Editorial Team.
