On a June afternoon in Texas, entomologist Maxwell Scott toured a USDA facility designed to release sterile screwworms by the millions—arriving just as the first confirmed case of the New World screwworm had touched down in the state. The timing was both sobering and hopeful: it meant Scott's decade-long work in genetic engineering was moving from laboratory theory into the urgent reality of livestock protection.
The New World screwworm is a blowfly that lays eggs in wounds or vulnerable spots on livestock, pets, wildlife, and humans, then feeds on living tissue. For decades, the U.S. held the line against this parasite through massive radiation-sterilization programs that kept it confined south of the Texas border. But when a major outbreak began spreading through Central America in 2025, the stakes shifted. Scott and his team at NC State University, funded by the U.S. Department of Agriculture, had already been developing something potentially game-changing: male-only sterile screwworm lines, now under EPA review under the trade name NovoFly.
The innovation sits at the heart of what makes Scott's work revolutionary. Since the 1950s, screwworm suppression relied on irradiating pupae with radiation and releasing both males and females. The females don't help—they simply compete with fertile females for mating, wasting resources and effort. Scott's male-only genetic approach eliminates that waste entirely. By using CRISPR and gene editing to create lines that produce only males, every released fly becomes an active soldier in population control.
When Scott visited the new USDA APHIS distribution center in Edinburg, Texas, he found a facility humming with purpose. The center receives sterilized pupae shipped from Panama—the only rearing facility currently online—and processes them for distribution across threatened areas. The operation runs on multiple fronts: ground crews in specialized trucks can disperse about 2 million sterile flies per operation, while suspension systems hang pupal cases from trees for natural emergence. Most ambitious of all, specialized aircraft are being deployed to distribute flies from the air, the most efficient method for covering vast ranching territory.
The ranching community Scott addressed at the Texas and Southwestern Cattle Raisers Association summer meeting in Houston showed they were more than ready. With over a year of preparation since the Central American outbreak began, cattle ranchers had absorbed lessons on identification, reporting, and specimen collection. Texas A&M's agricultural extension service had been relentless in education, and at the conference itself, distributors were handing out collection kits—ethanol bottles and instructions for capturing suspect maggots and sending them for formal identification. Knowledge, in this case, was the first line of defense.
What struck Scott most was the readiness. The infrastructure existed. The genetic solutions were being refined. The ranchers understood the stakes. What remained was execution—getting the sterile flies into the field fast enough to suppress a population before it established itself in American territory. The convergence of traditional suppression methods with cutting-edge genetic engineering suggested the screwworm, for the first time in decades, faced opposition on two fronts. That June afternoon in Texas wasn't just a tour; it was a glimpse of how modern pest control might finally turn the tide.