As combines begin to roll in soybean fields, farmers are being asked to report yield losses from dicamba damage to help determine steps needed to prevent a repeat of problems experienced this summer.

The Iowa Soybean Association last week said it is “seeking additional input, especially yield data, from farmers” as it works with regulators and technology providers to assess the damage and improve the technology for next year.

An estimated 3.1 million U.S. soybean acres were impacted by off-target dicamba applications —including drift and volatilization — this year after the introduction of soybeans engineered to be tolerant of over-the-top dicamba applications, according to University of Missouri weed scientist Kevin Bradley.

The damage occurred despite new dicamba formulations, and a long list of label restrictions, aimed at controlling off-target herbicide movement....