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WASHINGTON, Aug 17 (Reuters) - The United States on Thursday escalated its objections to Mexico's curbs on genetically modified corn imports, requesting a dispute settlement panel under the North American trade pact, the U.S. Trade Representative's office said. The request to send the dispute to arbitrators was announced after formal consultations failed to resolve deep divisions between the two close trading partners over use of genetically modified (GM) corn, widely produced by U.S. farmers. Mexico's Economy Ministry said it would defend its GM corn policies before the dispute panel, saying on the social media platform X that they "are consistent with trade obligations." Washington alleges that Mexico's decree banning imports of GM corn used in dough and tortillas for human consumption is not based on science and violates its commitments under the U.S.-Mexico-Canada Agreement on trade launched in 2020. If the panel rules in favor of the U.S. and Mexico fails to comply with its directives, USTR could ultimately win the right to impose punitive tariffs on Mexican goods, which could spark a rare North American trade war. U.S. Trade Representative Katherine Tai said in a statement that the move was aimed at enforcing Mexico's USMCA obligations to maintain science-based regulations on agricultural biotechnology. "It is critical that Mexico eliminate its USMCA-inconsistent biotechnology measures so that American farmers can continue to access the Mexican market and use innovative tools to respond to climate and food security challenges," Tai said. Mexico now buys about $5 billion worth of U.S. GM corn annually, mostly for livestock feed. It says biotech corn harms native varieties and may have adverse health effects, an assertion that the U.S. side disputes.   Mexico's also plans to ban the herbicide glyphosate, which it considers dangerous amid lawsuit settlements with cancer patients despite regulators worldwide determining its safety. Many GM corn varieties are modified to tolerate the herbicide. Canada's Trade Ministry, which has sided with U.S. concerns about Mexico's corn policies, "is considering its next steps," a spokesperson said, adding Trade Minister Mary Ng "has consistently been clear about the importance of maintaining science-based approaches to biotechnology approvals." Corn futures temporarily pared gains at the Chicago Board of Trade after USTR's announcement as traders worried the spat could threaten U.S. exports to Mexico. FRUITLESS CONSULTATIONS The panel request follows 75 days of formal consultations requested by U.S. officials in June. Mexico has sought U.S. cooperation to jointly conduct scientific research on the health impacts of genetically modified corn, but Mexican officials told Reuters on Aug. 3 that their U.S. counterparts denied the request. "Mexico's approach to biotechnology is not based on science and runs counter to decades' worth of evidence demonstrating its safety and the rigorous, science-based regulatory review system that ensures it poses no harm to human health and the environment," U.S. Agriculture Secretary Tom Vilsack said in the statement. He added that innovations in agricultural biotechnology to enhance yields also help ease challenges on global food and nutrition security, climate change and food price inflation. USTR's decision drew cheers from U.S. corn trade groups and U.S. lawmakers from both parties, who say Mexico's policies were hurting U.S. farmers. "U.S. officials have exhausted every avenue trying to resolve this conflict and are left with no other choice but to turn to a third-party panel in hopes of quickly rectifying this issue," National Corn Growers Association Tom Haag said in a statement. "We are deeply appreciative of USTR for standing up for America’s corn growers." Republican Senator Deb Fischer of Nebraska said the move would "hold Mexico accountable and prevent its blatant trade violation under the USMCA." Under USMCA's dispute settlement rules, a five-person panel, chosen from a roster of pre-approved experts, must be convened within 30 days, with a chair jointly chosen and the U.S. side choosing two Mexican panelists and Mexico choosing two American panelists. The panel will review testimony and written submissions and its initial report is due 150 days after the panel is convened. Previous USMCA dispute panels last year ruled in the U.S.'s favor in a dispute over Canadian dairy quotas, and against the U.S. on automotive rules of origin, siding with Mexico and Canada. There have been other disagreements between the U.S. and Mexico, most notably over energy in which the U.S. has argued that Mexico's nationalist policy prejudices foreign companies.

Speaking at an industry event on Thursday, JBS CEO Gilberto Tomazoni said he still believes Chinese beef consumption will rise over time as eating that kind of protein is “aspirational” in Chinese society. He said five years ago China’s per capita beef consumption was about 5 kg (11 pounds) whereas now it is around 7 to 7.5 kg (15 to 17 pounds). “When pork prices became cheap again in China, there was no change in the beef curve,” he said. “Beef consumption in China will rise in the long run.”   However, Brazilian beef exports to China in the first half fell 29% to $2.6 billion, and by volume the drop was 5% to 512,306 metric tons, trade data shows. Eduardo Miron, the chief executive of family-owned Brazilian beefpacker Frigol, said at the same event that the slump is cause for concern. He also worries about currently low domestic consumption and exporters’ dependence “on a single importer,” referring to China. According to a U.S. Department of Agriculture (USDA) report issued in March, Chinese demand in 2022 accounted for 64% of total Brazilian beef exports. The closest beef export destination for Brazil was the United States, with a 7.6% chunk.   In 2023, China’s beef imports may fall because its domestic output is expected to increase, said the USDA. “After the end of lockdowns, the mad-cow related ban, we had the impression (China’s) demand would be as strong as in 2022,” said Miron, who was previously Marfrig’s chief executive and worked for Cargill. “We all got surprised.” For meatpackers like Frigol, which only produces beef in Brazil, risks may be greater than for more globalized rivals. “As the Brazilian cattle production cycle reaches its peak, the growing availability of cattle will pressure animal and beef prices downwards this year,” the USDA said.