Attacking Waterhemp Resistance

Waterhemp

Sometimes the best defense is a good offense. When fighting herbicide-resistant weeds, offensive moves could mean robust crop and herbicide mode of action rotations. Crop farmers on the Northern Plains may want to keep that advice in mind as glyphosate-resistant waterhemp begins to move into the region.

“Glyphosate-resistant waterhemp is certainly in southern Minnesota and is a growing problem in that area,” says Jeff Stachler, Ph.D., Extension weed scientist at North Dakota State University and University of Minnesota. “Corn and soybeans are the main crops in southern Minnesota, which is why there is so much resistance. It is also present in the southern Red River Valley, and we expect it to become a problem in southeastern North Dakota as well.”

Growers on the Plains are accustomed to managing other resistant weed species, such as ALS-resistant kochia and Russian thistle. Resistant waterhemp, however, may be a much greater challenge. “It already is a huge issue for soybean and corn growers,” Stachler says. “Waterhemp produces large quantities of seed, and there are limited herbicide options.”

In fact, waterhemp was among the first weeds documented to be resistant to multiple modes of action – ALS-, HPPD-, PSII- and PPO-inhibitors and glyphosate.

“A fifth example of resistance in one weed species is overwhelming evidence that resistance to virtually any herbicide used extensively on this species is possible,” says Aaron Hager, Ph.D., Extension weed specialist at the University of Illinois. “Waterhemp is not a weed species that can be adequately managed with one or two different herbicides. This troublesome weed requires a much more integrated approach.”

Crop rotation patterns in and near the southern Red River Valley exacerbate the problem. Many growers plant Roundup Ready corn, soybeans and sugarbeets in succession, with no break in the glyphosate cycle. Continuous exposure to a single mode of action places significant selection pressure on waterhemp and other weeds, increasing the likelihood of selecting glyphosate-resistant weeds.

“There may not be much resistant waterhemp here yet,” says Kevin Thorsness, technical service representative for Bayer CropScience in North Dakota. “But as we continue to plant more and more Roundup Ready corn, soybeans and sugarbeets in southeastern North Dakota, it’s only a matter of time before we see development of waterhemp resistance to glyphosate.”

Wheat and other small grains have always been good rotation crops, for multiple agronomic reasons. They also can be helpful in breaking up the glyphosate cycle and helping prevent waterhemp resistance. Controlling weeds in wheat with Huskie herbicide from Bayer CropScience will reduce waterhemp pressure when growers rotate to other crops the following season.

With two modes of action, Huskie herbicide from Bayer CropScience gives cereal growers effective, broad-spectrum weed control without relying on glyphosate. One mode of action inhibits an enzyme critical for plant pigmentation, resulting in the bleaching and rapid control of weeds. A second mode of action blocks photosynthetic processes. As a result, Huskie controls more than 50 hard-to-manage broadleaf species, including many that have become resistant to ALS inhibitors and provides partial control of 20 others.

Thorsness recommends having a good resistance-management program in place to avoid waterhemp resistance. “Don’t rely on a single technology, and possibly add LibertyLink soybeans to the rotation,” he says. Rotate herbicide modes of action, not just crops. Remember, the best way to combat resistance is to play good offense.”

Topics:

Leave a Reply

Herbicides Stories

Crop InputsEU Glyphosate Controversy Heating Up Yet Again
August 17, 2016
The battle over glyphosate rages on in Europe, creating a lot of question marks over whether the herbicide will continue Read More
Winter Wheat
HerbicidesNew Wheat Herbicide Helps Growers Manage Resistant Weeds
August 2, 2016
Quelex herbicide from Dow AgroSciences is now registered by the U.S. EPA, providing wheat growers a new solution for advanced Read More
Palmer pigweed seedhead in cotton
HerbicidesStudy: Fall Weed Controls Can Make Significant Impact On Glyphosate-Resistant Palmer Amaranth
July 28, 2016
An article published in the latest issue of the journal Weed Science shows that adopting harvest-time and post-harvest weed controls Read More
Palmer pigweed in soybean stubble
HerbicidesSpecial Issue Of Weed Science Explores Human Aspects Of Herbicide Resistance
July 27, 2016
Weeds that evolve resistance to herbicides are a serious threat to global agricultural production. In this Special Issue of Weed Science, Read More
Trending Articles
ASMARK 2016 Retailers Live! Tour - CPS
CropLife 100CPS Acquires Texas Retail Operation
August 23, 2016
Crop Production Services (CPS) has acquired the assets of Larry’s Chemical and Spray, Inc., for an undisclosed amount in an Read More
Key Cooperative Marcus Construction Steel Building
Retail FacilitiesMarcus Construction Builds High-Speed Agronomy Center For Key Cooperative
July 7, 2016
Key Cooperative in Grinnell, IA, wanted a state-of-the-art Agronomy Center to better serve its customers. Marcus Construction delivered exactly that. Read More
Heritage Cooperative
Retail FacilitiesKahler Automation Designs State-Of-The-Art Facility For Heritage Cooperative
July 4, 2016
Heritage Cooperative in Marysville, OH, needed an efficient liquid, dry and grain facility to serve the many needs of their Read More
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stewardship Certification Program
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To Explore IT Solutions
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
Monsanto Luling Plant
Eric SfiligojWhat’s Next For Monsanto?
May 31, 2016
For the folks at Monsanto’s headquarters in St. Louis, MO, it has been an eventful few weeks. Back on May Read More
Latest News
MAGIE 2015 Overview
Eric SfiligojThe Read From MAGIE
August 29, 2016
As I write this column, I’ve just returned from the annual Midwest AG Industries Exposition (MAGIE) in Bloomington, IL. Being Read More
EquipmentAGCO Opens Nominations For 11th Annual Operator Of The …
August 29, 2016
AGCO Corp. is now accepting nominations for 2016 Operator of the Year, which recognizes hard-working applicators across the country. These Read More
CHS St. Paul, MN fertilizer terminal
CropLife 100CHS Completes $10 Million Renovation Of St. Paul Agrono…
August 29, 2016
CHS Inc., North America’s leading farmer-owned cooperative and a global energy, grains and foods company, has completed a $10 million Read More
2016 ShowStopper | Case IH Patriot 4440 Sprayer
Equipment5 Show-stopping Products On Display At 2016 MAGIE
August 26, 2016
For 10 years now, visitors to the yearly Midwest AG Industries Exposition (MAGIE) show have been tasked with voting for Read More
Crop InputsDuPont Pioneer: Corn Belt P and K Levels Lagging
August 24, 2016
A new DuPont Pioneer study conducted across 12 Corn Belt states demonstrates that growers may be leaving profit potential in Read More
Monsanto sign
Crop InputsCould a Monsanto-Bayer Union Be 2 Weeks from Fruition?
August 24, 2016
Via STLToday.com (The St. Louis Post-Dispatch): Merger talks between Monsanto Co. and Bayer AG are advancing after a series of Read More
EquipmentCase IH Debuts Nutri-Tiller 955 Strip-Till Applicator
August 24, 2016
With strip-till continuing to expand across new acres, Case IH designed the new Nutri-Tiller 955 strip-till applicator to help producers Read More
EquipmentCase Launches Aim Command FLEX, 25th Anniversary Patrio…
August 24, 2016
Case IH announces new AIM Command FLEX advanced spray technology for greater application accuracy, as well as special 25th Anniversary Read More
ASMARK 2016 Retailers Live! Tour - CPS
CropLife 100CPS Acquires Texas Retail Operation
August 23, 2016
Crop Production Services (CPS) has acquired the assets of Larry’s Chemical and Spray, Inc., for an undisclosed amount in an Read More
PrecisionAg Video Conference
Precision AgVideo: PrecisionAg Vision Conference
August 22, 2016
A Strategic Conference Focused on the Future of Farm Digitization and Precision Agriculture Visit precisionagvision.com and register today! Read More
Young Corn Plants
Industry NewsOABA Welcomes Nicole Wallace As Communication & Adm…
August 22, 2016
The Ohio AgriBusiness Association has hired Nicole Wallace as its communication and administrative coordinator. Wallace will help provide comprehensive communication Read More
Syngenta Sign
Crop InputsChemChina, Syngenta Receive Clearance From CFIUS
August 22, 2016
China National Chemical Corp. (ChemChina) and Syngenta have announced that the companies have received clearance on their proposed transaction from the Read More
ManagementAg Industry Shows and Rumors
August 18, 2016
Editors Paul Schrimpf and Eric Sfiligoj talk about the upcoming trade show schedule, crop protection merger updates, and content for Read More
MAGIE 2015
EquipmentMAGIE Takes The Pulse Of The Ag Retail Industry
August 18, 2016
Every year, one of the major highlights of my career as an ag journalist is attending the Midwest AG Industries Read More
MAGIE 2015 Overview
EquipmentPride In Professionalism On Display At MAGIE
August 18, 2016
The Illinois Fertilizer & Chemical Association (IFCA) is proud to partner with CropLife IRON and continue the tradition of bringing Read More
SprayersJenner Ag To Debut 25th Anniversary Edition Case IH Pat…
August 18, 2016
Visitors at the 2016 Midwest Ag Industries Exhibition (MAGIE) in Bloomington, IL, will have a unique photo opportunity, as Jenner Read More
Crop InputsEU Glyphosate Controversy Heating Up Yet Again
August 17, 2016
The battle over glyphosate rages on in Europe, creating a lot of question marks over whether the herbicide will continue Read More
Industry NewsNew Partnership Provides Improved Representation At Ohi…
August 16, 2016
The Ohio AgriBusiness Association (OABA) has retained Belinda Jones of Capitol Consulting Group, Inc. (CCG) for government relations work in Read More