New World screwworm infestations have prompted Texas ranchers to adopt drones and intensified inspections to halt a parasite eradicated 60 years ago. Fifth-generation rancher Stephen Diebel has spent 18 months monitoring the threat as the fly’s return threatens $700 million in annual losses, according to USDA estimates. His proactive measures—limiting grazing access and deploying insecticides—reflect a statewide effort to contain the flesh-eating pest before it spreads beyond the Lone Star State.

The crisis underscores a fragile victory over the screwworm, which was eliminated from the US in the 1950s. Now, ranchers face a dual challenge: immediate eradication and long-term prevention. Drones are increasingly critical, allowing farmers to survey herds across vast plains without physical risk. However, the parasite’s resilience raises questions about the effectiveness of current strategies. The USDA’s campaign relies on rapid reporting of suspected cases, but Diebel notes that early detection remains a gamble. His operation alone mirrors thousands of similar efforts across Texas, where the economic stakes are existential for small and large operations alike.

Beyond livestock losses, the screwworm’s return could disrupt regional agriculture and trade. The parasite targets livestock wounds, causing fatal infections that spread rapidly. Diebel’s experience highlights the human element of this battle: farmers balancing technological solutions like drones with traditional methods. While state authorities coordinate inspections, the success of these measures hinges on ranchers’ vigilance. Without sustained action, the $700 million annual loss figure could balloon, jeopardizing Texas’ $120 billion cattle industry. The screwworm’s reemergence serves as a stark reminder that eradicated threats can resurface, demanding constant adaptation in agricultural practices.