Vietnam has issued a ban on fresh imports of glyphosate-containing herbicides after a U.S. court ruled they are carcinogenic.

A U.S. court ruled last Tuesday that Roundup, a weed killer produced and sold by controversial American agrochemical giant Monsanto, causes cancer.

Vietnam’s Plant Protection Department has asked businesses to stop signing new import contracts for glyphosate-based herbicides.

Products already in circulation are not affected by this decision, however.

“As soon as we heard the second U.S. trial’s verdict that glyphosate is related to cancer, we have issued a document to ban new herbicide imports containing the active ingredient. The removal of this substance from the list of usable herbicides in Vietnam will also be issued in the near future,” a Tuoi Tre report quoted Hoang Trung, head of the Plant Protection Department, as saying.

The department also asked businesses, organizations and individuals to report back on the production, sales and storage of glyphosate-based herbicides.