The New World Screwworm, a parasitic fly that affects livestock and other warm-blooded animals, has emerged in South Texas. The USDA Animal and Plant Health Inspection Service confirmed that screwworm larvae were found in a calf in Zavala County, Texas. As of June 11, six cases have been reported.
Screwworm larvae burrow into the flesh of living animals, causing significant harm and economic losses. While these worms do not make meat unsafe to eat, they pose a threat to beef prices, which are already high.
U.S. Agriculture Secretary Brooke Rollins announced a suspension of cattle, horse, and bison imports through southern U.S. ports due to screwworm spread in Mexico. The USDA has previously overcome screwworm infestations, investing in tools and resources to combat their spread. A rapid response team is currently on the ground in Texas, releasing sterile male flies and establishing a quarantine zone.
The USDA’s efforts to eradicate the screwworm date back to the 1920s and 1930s, with methods like the Screwworm Adult Suppression System, which uses insecticides and sterile flies. Despite these efforts, screwworms recently advanced over 1,100 miles from Mexico to Texas, drawing criticism from Texas Agriculture Commissioner Sid Miller, who called for more comprehensive actions.
Dawn Buckingham, Texas Land Commissioner, highlighted the impact of screwworms on livestock and wildlife, offering state lands to support eradication efforts. She emphasized the need for swift action, given their rapid advance from Central and South America.
Buckingham and local ranchers have been tracking the screwworm’s movements, noting their ease of travel due to modern global movement. However, she remains optimistic about managing the threat thanks to existing treatments and control strategies.
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