US gears up for billion-dollar battle against a tiny pest

A tiny fly is causing outsized concerns for America's cattle industry.

The New World screwworm, a parasitic pest whose larvae burrow into the flesh of living animals, has been detected in the US for the first time in decades.

Catch up quick: The first US case was detected in South Texas on June 3, with the number of confirmed cases climbing to 12 currently across Texas and New Mexico.

• The infections have been found in cattle, sheep, goats, and a dog, with no human cases reported.
• Federal officials are now racing to contain the outbreak before it spreads further through livestock herds, with the USDA preparing a $1+ billion response effort.

Creating a sterile environment

The centerpiece of the US government’s plan involves building a new facility capable of producing and releasing ~300 million sterile male screwworms per week.

• The insects mate with wild females and prevent reproduction, gradually collapsing pest populations in an eradication technique that’s long been considered the gold standard.
• However, the facility isn’t expected to begin producing screwworms until November 2027 under the current plan.

Ranchers welcome beefed-up security. The domestic screwworm outbreak comes at a challenging time for the US cattle industry. America’s herd is currently at its lowest level in ~75 years, with beef prices rising at a 12.9% annual rate in May to reach a new record high.

The recent spread of screwworm across Mexico has reduced cattle imports into the US, adding more pressure to an already tight supply chain.

Looking ahead…Some economists warn that additional outbreaks could further restrict cattle supplies and push prices higher, while others note that the livestock industry has successfully contained such outbreaks before.