"CHICAGO - Minnesota became the latest U.S. state on Tuesday to restrict controversial weed killers made by Monsanto Co and BASF SE that were linked to widespread crop damage, while Arkansas took a step back from imposing new limits.

The United States has faced an agricultural crisis this year caused by new versions of the herbicides, which are based on a chemical known as dicamba. Farmers and weed experts say the products harm crops that cannot resist dicamba because the herbicides evaporate and drift away from where they are applied, a process known as volatilization.

Monsanto and BASF say the products are safe when used properly. "

Tom Polansek reports for Reuters December 12, 2017. [2]