This bill directs the Secretary of Agriculture to begin construction within 180 days on one or more modular New World screwworm fly rearing facilities. The facilities would rear sterile flies and enable dispersed releases to areas deemed at risk of infestation.
It defines eligible areas based on migratory patterns of confirmed detections and suitability for dispersal, and requires annual reports to Congress and the public website documenting threat assessments, control efforts, and outcomes.Finally, the bill authorizes a $300 million appropriation to fund these activities, with funds available until expended.
At a Glance
What It Does
The bill requires the Secretary of Agriculture to begin constructing modular facilities for rearing sterile New World screwworm flies within 180 days of enactment, and to use those facilities to disperse flies to areas at risk of infestation.
Who It Affects
States identified as at-risk for screwworm invasion, agricultural producers in those areas, and USDA APHIS operations; local and state veterinary and pest-control entities involved in monitoring and response.
Why It Matters
Establishes a proactive containment program to curb screwworm spread, protecting livestock health, product markets, and overall agricultural resilience through sterile-insect technology and rapid deployment.
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What This Bill Actually Does
Section 2 of the bill creates a new program under the Animal Health Protection Act to establish a New World screwworm fly rearing facility. The Secretary of Agriculture is required to begin construction of modular facilities within 180 days of enactment.
These facilities would rear sterile screwworm flies and enable their dispersal to designated areas at risk of infestation, with the goal of preventing outbreaks and limiting the geographic spread of the pest.
Eligible areas are defined as state areas where screwworms are migratory enough to pose a risk and where releasing sterile insects is logistically feasible. The program must report, within one year of enactment and on an ongoing basis each year thereafter, on the current threat to U.S. agriculture and on progress and effectiveness of the containment efforts, with the reports published to Congress and publicly on the Department of Agriculture’s website.The bill also authorizes $300 million in appropriations to carry out these provisions, available until expended.
Overall, the measure signals a shift toward a centralized, proactive biological-control approach to screwworm management, leveraging sterile insects and coordinated reporting to track risk and performance.
The Five Things You Need to Know
The bill adds a new 10409B provision to authorize modular rearing facilities for sterile New World screwworm flies.
Facilities must rear sterile flies and enable their dispersal to areas at risk of infestation.
Eligible areas are chosen based on migratory detections and suitability for releasing sterile flies.
Annual progress reports to Congress and a public Department of Agriculture website are required.
A $300 million appropriation is authorized to fund construction, operation, and reporting, available until expended.
Section-by-Section Breakdown
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Short Title
The act is named the Strengthening Tactics to Obstruct the Population of Screwworms Act, or STOP Screwworms Act, establishing the legislative frame for the new program.
New World Screwworm Fly Rearing Facility
This section amends the Animal Health Protection Act by inserting a new Sec. 10409B. It requires the Secretary to begin construction within 180 days on modular facilities to rear sterile New World screwworm flies and to disperse them to areas at risk of infestation. Eligible areas are states deemed at risk due to migratory patterns of detected screwworms and suitable for dispersal. The section also mandates annual reporting to Congress and a public website, detailing threat analyses, ongoing control efforts, and the effectiveness of those efforts. An authorization of $300 million is provided to fund these activities, available until expended.
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Explore Agriculture in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Livestock producers in at‑risk states, who gain protection against outbreaks and potential economic losses from screwworm infestations by receiving a buffer through sterile-insect releases.
- USDA APHIS and related Department of Agriculture entities, which gain a formal framework and funding to implement proactive control measures and oversight.
- State agriculture departments in affected regions, benefiting from clearer federal guidance, funding, and data on infestation risk and response.
- Veterinary services and extension programs that monitor and respond to screwworm activity, with improved information sharing and risk management tools.
- Livestock exporters and domestic markets that rely on stable livestock health and disease-free status, potentially reducing market disruptions from screwworm events.
Who Bears the Cost
- Federal taxpayers funding the $300 million appropriation for construction and operations.
- The USDA budget for ongoing facility maintenance, staffing, and program administration.
- State and local agencies involved in permitting, coordinating releases, and monitoring outcomes, which may incur administrative costs.
- Private contractors and suppliers providing modular facility construction, equipment, and insect-rearing technology.
- Potential costs to participants in the supply chain associated with program implementation and compliance activities.
Key Issues
The Core Tension
Rapid, large-scale dissemination of sterile insects to prevent screwworm outbreaks versus the substantial upfront cost, potential ecological risk, and the need for credible effectiveness monitoring.
The main policy tension lies in balancing urgent, proactive pest suppression with substantial upfront and ongoing costs, as well as the logistical challenges of building and operating large-scale sterile-insect facilities. While the program aims to protect agricultural sectors, it requires a significant, long-term funding commitment and robust oversight to ensure that releases are effective and do not produce unintended ecological consequences.
The reliance on migratory-pattern-based area designation also raises questions about data adequacy and geographic targeting, which could affect where resources are deployed and how quickly they scale.
A second tension is the governance and accountability framework. The bill requires annual reporting and public disclosure, but it does not specify detailed metrics for success or independent verification processes.
Ensuring timely data collection, unbiased evaluation, and transparent reporting will be critical to maintaining confidence among policymakers, producers, and the public.
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