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Home » U.S. Criticizes Mexico’s Handling of Screwworm Near Border

U.S. Criticizes Mexico’s Handling of Screwworm Near Border

September 26, 20253 Mins Read News
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By Leah Douglas and Cassandra Garrison

WASHINGTON, Sept. 25 (Reuters) – U.S. Agriculture Secretary Brooke Rollins on Thursday said Mexico has not adequately enacted protocols to curb the spread of New World screwworm, a sign of tension between the two countries as they navigate the northward march of the pest.

Rollins blamed a recent screwworm detection less than 70 miles (113 km) from the U.S. border on Mexico’s failure to curb cattle movements and inadequate monitoring of fly traps meant to reduce the wild population of screwworm flies, which infest and can kill livestock if untreated.

Screwworm has not yet crossed the U.S. border, according to officials, but poses a multibillion-dollar risk to the U.S. beef industry. The U.S. has kept its border mostly closed to Mexican cattle imports since May.

The outbreak has heightened tensions between the countries ahead of a planned review of the United States-Mexico-Canada trade agreement and rattled their livestock and beef sectors.

The USDA on Sept. 21 said it had learned of the case in Nuevo Leon, which borders Texas.

Within hours, USDA had sent staff to the region, Rollins said on Thursday at the Ag Outlook Forum in Kansas City, Missouri.

“Unfortunately, what we found is Mexico has failed to enforce proper cattle movement controls in infected regions and is not tending to fly traps daily as promised, which hinder our real-time detection capabilities. This is unacceptable,” Rollins said.

She said that reopening the border to livestock trade is contingent on total compliance with agreed-upon surveillance protocols.

Mexico’s sanitation agency Senasica said its fly trap system is checked every three or four days, a frequency that was jointly determined with APHIS, the animal health arm of the USDA.

“Regarding the detection of a case of New World screwworm in northern Mexico, it should be noted that this finding was possible thanks to the application of a protocol established in the bilateral action plan,” Senasica told Reuters, adding that it has implemented a double inspection system at the livestock’s point of origin.

Mexican President Claudia Sheinbaum on Wednesday said that Mexico had not been notified by the USDA of any change to the expectation that the U.S. will reopen its border before November and that controlling the movement of livestock within Mexico is complicated.

The U.S. has invested $21 million in a facility in southern Mexico to produce sterile flies that are released to reduce the mating population of wild flies.

(Reporting by Leah Douglas in Washington and Cassandra Garrison in Mexico City; Editing by Leslie Adler and Deepa Babington)

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