Dr. Jeff Stachler from NDSU has been collecting samples and testing weed seeds for many years. His newest resistance map shows that between 5 – 60% of fields in the eastern two-thirds of ND are suspected to contain resistant kochia. And the really scary part is this kochia is also believed to have dual resistance to Dicamba.
These findings point out that the use of PRE herbicides is more important than ever. I have developed a chart focusing on the use of PREs in the management of our region’s resistant weeds, using the NDSU weed guide as its basis. You can find it in the ag resources section of our website.