United States releases 1 billion sterile flies to combat screwworm outbreak

The United States government has released its 1 billionth sterile fly in Texas to combat the resurgence of the New World screwworm. This parasitic fly lays eggs on warm-blooded animals, including humans, where the larvae can cause severe infection or death. The infestation poses a significant economic threat, with potential damages estimated at $2.5 billion in the Southwest alone, impacting a Texas livestock industry valued at $31 billion.

To control the population, scientists use the sterile insect technique: mass-rearing flies and using radiation to make them sterile before releasing them into affected areas. When wild females mate with these sterile males, they cannot produce offspring, leading to a population decline.

While the USDA has confirmed 48 cases in the U.S. since June, production capacity for sterile flies is currently struggling to meet demand. U.S. Agriculture Secretary Brooke Rollins stated that the country requires 400-500 million flies per week, but existing facilities in Panama and Mexico only produce approximately 100 million flies per week each.