February 17, 2017 | By: | Agronomy

Palmer Amaranth: Why Expansion Happens

With weed resistance at the forefront of farmer concerns for the 2017 growing season, we’re sharing a three-part series about an impending threat to our region – Palmer amaranth.

Each part features a short video clip from Dr. Jason Norsworthy’s presentation at last year’s Weed Resistance Regional Symposium, sponsored by Peterson Farms Seed. In Part 1 of the series, Dr. Norsworthy discussed concern surrounding Palmer amaranth as it encroaches on our region.

Today, in Part 2, Dr. Norsworthy addresses how expansion occurs, mentioning that Palmer has been discovered in 30 states and counting. Please note that the maps shown in the video were created in February 2016. Palmer amaranth has since been confirmed in Minnesota.

The biggest takeaway from this video is that Palmer amaranth exists in so many states because weed control programs lack diversity. There are many ways to diversify your weed control system – crop rotation, herbicide rotation, using multiple Modes of Action throughout the growing season, and cultural and mechanical forms of control.

For more information on selecting herbicides with multiple MOAs, download our Herbicide Classification Chart.

It’s critical to be proactive instead of reactive with weed control. The weed control traits we have available today are great tools, but are not a cure-all for weed resistance. We cannot fully rely on one herbicide trait going forward.

As always, give me a call with any questions and keep an eye on the blog next week for “Palmer Amaranth – What Happens Next”, the third topic in our series. In the meantime, check out the links below to learn more about identifying Palmer amaranth, why it spreads, and much more.

University of Minnesota Extension – Palmer Amaranth Study

Purdue University – Palmer Amaranth Biology, Identification, and Management

Adam Spelhaug, Agronomy Lead CCA

Adam Spelhaug

As the agronomy manager, Adam Spelhaug works diligently to determine the best genetics for our region, bringing growers what they need in their fields. Adam has been making his mark on Peterson Farms Seed since 2005. When he’s not discovering genetic breakthroughs, Adam can be found spending time with his family, golfing or bowhunting. He’s a North Dakota State University alumnus, and he’s proud of it. Don’t take any UND green into his office.

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