War on Weeds

The Battle Against Resistant Weeds

The bad news is that weed resistance has definitely arrived in our region. That will become clear to you as you explore the resources on this page. The good news is that effective tools to fight weed resistance are available.

For LibertyLink vs RR2Y Yield Comparisons click here to download

For all 2014 PFS LibertyLink soybean varieties click here to download


ND and MN Weed Resistance Map

Dr. Jeff Stachler, formerly Assistant Professor of Weed Control in Sugarbeets at NDSU, began developing regional weed resistance maps in 2006. For a summary of NDSU's weed resistance information, click here.

These maps clearly tell the story that growers must utilize new tools for weed control management. Watch below as they scroll from 2006 to 2012.


Black symbols show confirmed resistance. Blue how highly susceptible.

Provided by: Drs. Jeff Stachler, Jeff Gunsolus, Mike Christoffers, and Kirk Howatt



PRE Herbicide Effectiveness on Resistant Weeds

Adam Spelhaug, Peterson Farms Seed Research Manager has developed a chart for use in determining the effectiveness of various PRE herbicides on specific resistant weeds. click here to download



Watch this series of interviews with Minnesota farmer, Kirk Watt; Peterson Farms Seed President, Carl Peterson; and NDSU's Dr. Jeff Stachler.



Back When I Was Young, July 26, 2012, Authored by Carl Peterson, Peterson Farms Seed, President click here to download

The Kochia Battle Is On, February 15, 2013, Authored by Adam Spelhaug, Peterson Farms Seed, Research Manager click here to download