USDA: Screwworm Eradication Program Faces 12-Month Delay as Cattle Outbreak Expands
A multi-year gap between outbreak detection and effective biological control raises questions about federal preparedness timelines and the economic exposure facing U.S. beef producers.
The United States Department of Agriculture's primary biological countermeasure against the New World screwworm — a parasitic fly larva that burrows into living tissue of livestock — will not produce meaningful results for at least 12 more months, according to reporting by Bloomberg published June 13, 2026. The screwworm, caused by the fly Cochliomyia hominivorax, was eradicated from the continental United States in 1966 through a sterile insect technique (SIT) program jointly administered by the USDA's Animal and Plant Health Inspection Service (APHIS) and cooperating governments. The current outbreak, confirmed in U.S. border-adjacent regions, has prompted renewed deployment of that same SIT method — but production and dispersal capacity cannot scale to effective coverage levels for over a year, per the Bloomberg report.
APHIS records show the agency operates screwworm eradication programs under cooperative agreements with Panama and Mexico, with sterile fly production centered at a facility in Pacora, Panama. Program funding and operational data are disclosed through USASpending.gov under APHIS cooperative agreements, though specific contract modification timelines related to the current outbreak expansion have not yet been published in full. The USDA has not issued a formal emergency supplemental budget request to Congress as of June 13, 2026, according to a review of congressional appropriations committee records.
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The U.S. cattle industry generated approximately $88 billion in farm-gate receipts in 2024, according to USDA National Agricultural Statistics Service (NASS) data. A sustained screwworm presence in U.S. herds would impose direct costs through livestock mortality, veterinary treatment, and potential trade restrictions. Mexico suspended live cattle imports to the United States in May 2025 over screwworm concerns, a closure that affected an estimated 1.1 million head of cross-border cattle annually based on USDA Foreign Agricultural Service trade data. The import suspension's current status and any bilateral negotiation records would be contained in USDA trade correspondence, which has not been publicly released as of this date.
On the congressional side, the House Agriculture Committee and Senate Agriculture Committee hold jurisdiction over APHIS funding and emergency livestock disease response authority under 7 U.S.C. § 8308, which permits the Secretary of Agriculture to transfer funds for emergency eradication measures. No emergency transfer notice has been published in the Federal Register as of June 13, 2026, per a search of federalregister.gov. Neither committee has scheduled a public hearing on screwworm response as of this publication date, according to official committee calendars posted on agriculture.house.gov and agriculture.senate.gov.
What remains unknown: the exact acreage and herd count affected by the current outbreak, the total supplemental funding USDA is requesting or has received internally, and whether any bilateral trade agreement modifications with Mexico are under negotiation. These details would be disclosed through APHIS situation reports, congressional budget justification documents, and State Department diplomatic cables — none of which have been made public as of June 13, 2026.