Farm Industry News Blog

Game changer: Multiple-herbicide-resistant weeds in Minnesota, North Dakota

Herbicide-resistant weeds have continued to spread from the southern Corn Belt to northern states, including Minnesota and North Dakota. Now, multiple herbicide resistance weeds are being identified, which compounds the problem.

Weed resistance issues were top of mind for many farmers attending the 2012 Commodity Classic held last week in Nashville, Tenn. The media heard plenty about it at a couple pre-conference events.

University of Tennessee’s Larry Steckel spoke to media at a Bayer CropScience event about the glyphosate-resistant weed problems in his area.

“On June 21, 2011, I got a lot of calls that day – 80,” reported Steckel. “Most of the calls were about resistant Palmer pigweed and that’s when it dawned on me just how big of an issue this has become.”

He said growers can manage resistant Palmer pigweed if it is sprayed at 2 in. in height. But just 24 hours later when pigweed is 4 in. tall, glyphosate will control only 75% of the weed population. With only 75% control, farmers will not be able to combine the fields.

Later, a farmer at the event said he has heard of landlords losing their renters because of severe weed resistance in the fields. Land also has been sold at a discounted price if there are heavy populations of resistant pigweed on it.

Multiple resistance

If growers from the northern states think they are safe from the weed resistance issues, they need to think again. Jeff Stachler, extension weed specialist in Minnesota and North Dakota, has documented a serious spread of resistant weeds through these northern growing areas. Speaking at a BASF media event, he said some hot spots have resistant weeds in 75 to 90% of the fields. Resistant weeds include common ragweed, giant ragweed and waterhemp.

“We certainly had a big issue in 2011,” Stachler reported. “But that’s nothing. The real game changer is multiple resistance, which is resistance to more than just one mode-of-action herbicide.”

In fact, he says they may have identified ragweed and waterhemp with three-way resistance in Minnesota and North Dakota. The resistance is to glyphosate, ALS inhibiting and PPO inhibitor herbicides.


Discuss this Blog Entry 6

on Dec 9, 2013

excellent. one of the best articles I have every read. This is the information which I have been searching. Great information. Tembusu this article is worth bookmarking. keep it up !

on Mar 20, 2014

Thanks on your marvelous posting! I actually enjoyed reading it, you happen to be a great author. Pollen & Bleu | Pollen and Bleu I will ensure that I bookmark your blog and will come back someday

on May 2, 2014

great article. keep blogging the good stuff. will return for more | coco palms | coco palms pasir ris | coco palms condo

on Jul 10, 2014

Great blog and I love what you have to say and I think I will tweet this out to my friends so they can check it out as well. I like what you said | rise @ oxley | the rise @ oxley | the rise @ oxley residences

on Sep 16, 2014

it's resisistant usally because climate change i don't know exactly but that my father said
Jual besi Baja online

on Oct 3, 2014

They need to see more other aspects, why this always a big issues.

Post new comment
or to use your Farm Industry News ID
What's Farm Industry News Blog?

The Farm Industry News Blog features commentary from Willie Vogt, Jodie Wehrspann, Kathy Huting, Lynn Grooms, Daryl Bridenbaugh and Jeff Ryan.

Blog Archive

Sponsored Introduction Continue on to (or wait seconds) ×