Biological Control of Canada Thistle Status: CompleteReport Date: 09/28/2007 Summary: Researchers investigated the effectiveness of the recently discovered biological control agent PST for the control of Canada thistle in roadside rights-of-way and prairie wetland restoration systems, and found that an integrated management system based on PST has a significant impact on the management of this weed. Final Deliverables: Report #2007-38 Technical Summary Related Materials: Related Research: