Another class action lawsuit has been filed against seed giant Monsanto over last month’s discovery of an isolated field of genetically engineered wheat in Oregon.

Dan Brown, a wheat farmer in Seward County, sued Monsanto Tuesday on behalf of himself and potentially thousands of other growers.

It is at least the third lawsuit filed against St. Louis-based Monsanto over the release of the experimental wheat. Kansas farmer Ernest Brown individually sued the company earlier this month. A class action lawsuit was also filed in Washington this month on behalf of growers of soft white wheat.

Monsanto did not immediately respond to an email seeking comment. The company has said in response to the earlier filings that it has no legal liability and it has vowed to present a vigorous defense.