2026-06-03
CNN
Flesh-eating New World screwworm detected in Texas calf, USDA says, signaling major threat to food production
Max Scott, an entomology and plant pathologist at NC State who has genetically modified screwworm so the flies don’t reproduce, said outbreaks are typically controlled by rearing flies in a factory and sterilizing the bugs by exposing them to gamma rays when they are at the pupal stage. Scientists then release enough sterile flies to overwhelm the local fertile fly population. When the fertile female mates with a sterile male, they don’t produce offspring. “The USDA, over a 50-year period, succeeded in eradicating this fly all the way down to the Panama-Colombia border,” Scott said. “It was a lot of effort by a lot of people, but it’s largely unknown, unfortunately, because it was a big success story. They kept it there and away from here for 20 years, but the barrier failed a few years ago, and flies rapidly moved through Central America until where we are today.”