Have you noticed more flies around your home? If so, you’re not alone. Recent reports indicate a notable increase in fly populations in Texas, primarily due to a significant effort by the U.S. Department of Agriculture (USDA) to combat the outbreak of the New World Screwworm (NWS).
Since the beginning of the year, the USDA has released nearly 400 million sterile flies across Texas, focusing on areas along the Texas-Mexico border and in counties where NWS cases have been confirmed. This strategic approach aims to disrupt the mating cycle of the NWS, significantly reducing its population over time.
Rear Admiral Michael Schmoyer from the USDA emphasizes that utilizing sterile flies is the most effective method for controlling the spread of NWS. The life cycle of a typical fly lasts about 21 days, and they typically do not travel far from their food sources. Consequently, the sterile flies are strategically released in areas with confirmed NWS cases to ensure maximum impact.
These sterile flies are marked with a green dye, making them distinguishable from wild flies, although most people may not notice any significant differences. It’s important to note that NWS flies are relatively solitary and prefer moist, hidden environments. They are attracted to animals with injuries, where they can lay their eggs.
Given the potential risks associated with NWS, the USDA urges the public to remain vigilant. If you notice injured animals, it is crucial to report these cases to your veterinarian, the city health department, or county health authorities. Early detection and reporting can play a vital role in controlling this outbreak.
For the latest updates and information regarding the NWS situation, as well as to report any cases, please visit the USDA’s official website.

