Ag Alert May 21, 2025

USDA halts Mexican cattle imports due to parasitic fly

on a month-by-month basis, “until a signif- icant window of containment is achieved.” Any livestock currently in holding for entry into the U.S. will be processed normally. This includes a U.S. port inspection and treatment to ensure they are clear of NWS. Farm groups and lawmakers have been working to draw attention to the threats posed by the pest, said Matthew Viohl, a California Farm Bureau policy advocacy director. The first case of NWS was discovered in Southern Mexico and reported to the U.S. in November, after which USDA closed the

border for live animal trade. USDA resumed imports in February after the U.S. and Mexico implement- ed a preclearance inspection and treat- ment protocol. During the past two years, screw- worm has spread north throughout Panama and into Costa Rica, Nicaragua, Honduras, Guatemala, El Salvador, Belize and now Mexico. USDA said it has been releasing sterile flies by air and on the ground, focusing on Southern Mexico and other areas in Central America.

The continued and rapid north- ward spread of a parasitic fly in Mexico has prompted the U.S. Department of Agriculture to suspend live cattle, horse and bison imports through U.S. ports of entry along the southern border. New World screwworm has been de- tected in remote farms with minimal cat- tle movement as far north as Oaxaca and

Veracruz, about 700 miles away from the U.S. border, USDA reported. NWS can cause serious, often deadly damage when fly larvae burrow into the flesh of a living animal. The fly can infest livestock, pets, wildlife, occasionally birds and, in rare cases, people. USDA said the import suspension will be

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May 21, 2025 Ag Alert 13

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