USDA threatens to halt Mexican beef imports over flesh-eating fly crisis

In a dramatic move to protect America’s cattle industry, Agriculture Secretary Brooke Rollins has warned Mexico that the U.S. will halt imports of live animals — including cattle and bison — if Mexico doesn’t step up efforts to combat a dangerous pest creeping northward.

In a letter sent Saturday and obtained by Fox News, Secretary Rollins put the Mexican government on notice to act immediately to fight the spread of the New World screwworm or face serious economic consequences on the border. 

The USDA has set a firm deadline of April 30 for Mexico to address the growing crisis, or U.S. ports of entry will slam the door on key animal commodities.

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“I must inform you that if these issues are not resolved by Wednesday, April 30, USDA will restrict the importation of animal commodities, which consist of live cattle, bison, and equine originating from or transporting to Mexico to protect the interest of the agriculture industry in the United States,” Rollins wrote.

The New World screwworm, a flesh-eating fly whose larvae can decimate livestock populations, has been spreading rapidly from Central America into southern Mexico. USDA officials have long relied on a sophisticated sterile insect technique (SIT) program — using specially equipped aircraft to release sterile flies — to keep the deadly pest in check. But that strategy is now in jeopardy.

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At the heart of the conflict is Dynamic Aviation, a U.S. government-contracted carrier tasked with aerial fly dispersals. According to the letter, Mexican aviation authorities are limiting Dynamic’s operations to just six days a week under a temporary 60-day permit, a move the USDA says undermines the urgent, around-the-clock response needed to stop the screwworm’s advance.

Even more troubling, Rollins said Mexican customs officials are imposing hefty import duties on critical supplies like sterile flies, aviation parts and dispersal equipment — all fully funded by U.S. taxpayers to benefit both nations. These delays are expensive and threatening to cripple the campaign just when speed is most vital.

Rollins is demanding immediate action from Mexico, including long-term operational clearance for Dynamic Aviation, full duty waivers on all emergency materials and the appointment of a senior-level liaison to fast-track solutions.

Every day lost, Rollins warned, gives the screwworm a bigger foothold and risks devastating American ranchers and the broader agricultural economy.

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In a bid to salvage cooperation, Rollins also proposed an emergency U.S.-Mexico summit with government leaders, technical experts and operational partners to get back on track.

The message from Washington is clear: Mexico must move — and fast — or face tough new trade restrictions designed to protect America’s food supply and farming communities.