Texas declares emergency to contain screwworm fly; will combat pest with sterile flies

Texas Governor Greg Abbott has declared a state of disaster in Zavala and Uvalde counties following the confirmation of a New World screwworm fly case. This pest, which feeds on the living tissue of warm-blooded animals, was eradicated from the United States in the 1960s and poses a significant threat to the state's substantial livestock industry.

The declaration allows Texas to mobilize "all available resources" and reallocate personnel across the state to combat the parasite. Governor Abbott announced that efforts to contain the pest will include accelerating the transport of sterile flies to the affected areas. Additionally, a new facility for rearing these sterile insects will be constructed in Edinburg, located in the southern part of the state.

The strategy to combat the screwworm involves the sterile insect technique. This method entails raising large numbers of flies in laboratories, sterilizing the males through radiation, and then releasing them into infested zones. These sterile males mate with wild females, which reproduce only once in their lifetime, thereby preventing the hatching of viable larvae and halting the pest's life cycle.

The screwworm fly lays its eggs in open wounds or moist areas of an animal's body, such as the navels of newborns or small lesions. The larvae hatch rapidly, exacerbating wounds and potentially leading to severe injury or death if left untreated. While rare, the parasite can also affect humans. Federal authorities emphasize that early detection and veterinary treatment are crucial for saving affected animals and preventing the spread of the outbreak. Texas, home to over 12 million head of cattle, is particularly vulnerable to the economic impact of this pest, which can cause significant losses through animal mortality and reduced production.