By Jacob Bunge 

Archer Daniels Midland Co. sued Syngenta AG over losses the grain trader and processor said it suffered after Syngenta sold genetically engineered corn in the U.S. that had yet to win approval in China.

ADM said Syngenta's push to sell its biotech corn to U.S. farmers, without first securing Chinese import approval, led the Asian nation to reject shipments of U.S. corn in the past year. That caused "substantial economic losses and damages" for ADM, the company said in a lawsuit filed in a Louisiana state court.

The Chicago-based company, which buys grain and oilseeds from farmers and trades and processes them for buyers around the world, said some of its corn bound for Chinese buyers was turned away or seized after Chinese regulatory authorities detected the unapproved biotech corn developed by Syngenta.

ADM's lawsuit escalates legal battles over Syngenta's Viptera corn, which the company began selling in the U.S., Argentina and Brazil in 2011. Commodities trader Cargill Inc. and Trans Coastal Supply Co., another grain exporter, filed suits alleging significant losses in September.

ADM alleged its losses arose from Syngenta's negligence in managing the corn. According to ADM, Syngenta told the USDA it would develop and enforce programs aimed at separating Viptera corn from other varieties, to prevent it from finding its way onto ships bound for countries like China that had yet to approve it. However, ADM said, "Syngenta did none of this."

A Syngenta spokesman said the Swiss seed-and-chemical company "believes that the lawsuit is without merit and strongly upholds the right of growers to have access to approved new technologies."

He said Syngenta was fully transparent in marketing the corn, which it says provides tougher defenses against pests like corn earworms and black cutworms. Viptera represents 30% of the company's North American corn-seed sales.

ADM didn't specify in the lawsuit how much money it claims to have lost due to rejected shipments and lost sales, though a spokeswoman said the impact amounted to "tens of millions of dollars in losses and added costs."

Lawsuits by farmers have been filed in more than 10 states since then, blaming Syngenta for a sharp decline in U.S. corn exports to China this year and lower prices for the grain.

The farmer lawsuits, some of which seek class-action status, estimate more than $1 billion in losses for U.S. crop producers due to China's refusal to buy U.S. corn after the first cargos were rejected late last year.

U.S. corn exports to China plunged 87% to 189,000 metric tons in the first nine months of 2014 compared with a year earlier, according to U.S. Agriculture Department data. Last year, the Asian nation accounted for about 15% of U.S. corn exports.

Corn futures prices have dropped about 14% this year as expectations of another record U.S. crop grew. A bumper crop in 2013 drove prices 40% lower last year.

Some farmers and grain groups argue the drop in corn prices has been exacerbated by excess grain on the market after China began rejecting shipments.

ADM filed the lawsuit in Louisiana's 29th Judicial District Court for the Parish of St. Charles. About two-thirds of ADM's U.S. corn exports to China originated from the company's Louisiana terminals, the company said in the lawsuit.

Write to Jacob Bunge at jacob.bunge@wsj.com

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