This bill, known as the Strengthening Tactics to Obstruct the Population of Screwworms Act or the STOP Screwworms Act , mandates the Secretary of Agriculture to establish one or more modular New World screwworm fly rearing facilities. These facilities are designed to rear sterile New World screwworm flies and then disperse them to areas identified as being at risk of infestation. The primary goal is to control and prevent the spread of these pests, which pose a significant threat to agriculture. The Secretary must begin construction within 180 days of enactment, with eligible areas determined by migratory patterns of confirmed detections and suitability for sterile fly dispersal. Additionally, the bill requires the Secretary to submit an annual report to Congress, and make it publicly available, detailing the current threat posed by screwworm flies, the efforts undertaken to combat their migration, and the effectiveness of these measures. To fund these initiatives, the bill authorizes an appropriation of $300,000,000 , which will remain available until expended.