Syngenta isn’t backing away from plans to continue marketing its Agrisure Viptera and Duracade corn hybrids to U.S. farmers next year, despite a lingering trade spat with China that has spawned lawsuits from U.S. farmers and grain handlers.

“We believe we have a safe technology and a very effective technology, and growers should have the right to plant this technology,” said Chuck Lee, head of Syngenta’s North America corn div­­ision.

China’s rejections of...