Monsanto Co. is eliminating as many as 700 additional jobs as the company continues a restructuring of its Roundup herbicide business.

About 150 of the jobs being eliminated are in St. Louis, spokewoman Kelli Powers said.

The company initiated the restructuring of its weed killer business last summer by shedding 900 jobs or 4 percent of its workforce. The company doubled those job cuts three months later as the outlook for Roundup sales declined further.

The latest cuts will result in $180 million of pre-tax costs, $150 million of which will be realized in the fourth quarter, the company said in a statement.

Creve Coeur-based Monsanto also said fiscal year earnings will be at the low end of a previous forecast.