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

Palmer amaranth in soybean stubble
HerbicidesWSSA: Billions In Potential Economic Losses From Uncontrolled Weeds
May 4, 2016
What losses would corn and soybean growers experience if they were forced to eliminate herbicides and other control techniques from Read More
Spray Drift
HerbicidesRoundup Ready Xtend: Silver Linings In Label Delays For Monsanto
May 4, 2016
Since 2014, Monsanto has trained more than 20,000 growers and retailers on all aspects of its new dicamba-tolerant system at Read More
Giant Ragweed
HerbicidesSurvey Provides Insights On Giant Ragweed In The Corn Belt
May 2, 2016
A new survey published in the journal Weed Science offers insights into the distribution and management of giant ragweed, a Read More
Corn Field
HerbicidesNew Wilbur‐Ellis Herbicide Targets Volunteer Corn
April 28, 2016
Wilbur‐Ellis Co., a recognized leader in marketing and distribution of crop protection products, as well as precision agriculture technology, has Read More
Trending Articles
Eric SfiligojReasons For Hope In Commodity Prices
May 2, 2016
For many months now, the doomsayers have ruled the day in agriculture. Too much supply with too little demand would Read More
Eric SfiligojMissing The Family Ties In Agriculture
April 25, 2016
By its nature, the agriculture market is cyclical. Up and down cycles come and go with a regular pattern. For Read More
HerbicidesHerbicide Resistance In Waterhemp Continues To Grow
April 22, 2016
Twenty-five years ago, waterhemp was virtually unknown to Illinois farmers. Today, the broadleaf weed blankets corn and soybean fields across Read More
Eric SfiligojBiotech Corn Drop More Economics Vs. Consumer Rejection
April 18, 2016
Since their introduction into the agricultural marketplace, biotech crops has steadily grown in acreage in the countries of the world Read More
Crop InputsBayer: 5 Reasons We Disagree With Maryland Neonic Ban
April 12, 2016
We’re disappointed that the Maryland legislature chose not to stand up for sound science and the rights of Maryland’s homeowners Read More
Corn
OpinionChallenging Global Economic Conditions Putting More Heat On U.S. Ag Retailers
April 7, 2016
There it is. That vague, slightly sickening feeling in the pit of my stomach. Things are getting weird out there. Read More
Latest News
Industry NewsHELM AGRO Adds New Marketing & Business Development…
May 4, 2016
HELM AGRO US, Inc. has announced the hiring of Troy Bettner as the company’s new Marketing & Business Development Leader. Bettner Read More
Palmer amaranth in soybean stubble
HerbicidesWSSA: Billions In Potential Economic Losses From Uncont…
May 4, 2016
What losses would corn and soybean growers experience if they were forced to eliminate herbicides and other control techniques from Read More
Spray Drift
HerbicidesRoundup Ready Xtend: Silver Linings In Label Delays For…
May 4, 2016
Since 2014, Monsanto has trained more than 20,000 growers and retailers on all aspects of its new dicamba-tolerant system at Read More
Syngenta headquarters in Basel, Switzerland
Crop InputsSyngenta Board Appoints New CEO
May 4, 2016
Syngenta announced today the appointment of J. Erik Fyrwald, currently President and CEO of the U.S. chemistry distribution company Univar Read More
Crop InputsIntrexon Establishes Crop Protection Enterprise
May 4, 2016
Intrexon Corp., a leader in synthetic biology, has announced the formation of Intrexon Crop Protection (ICP), a wholly-owned subsidiary dedicated to Read More
Patriot 4440 Sprayer close up
ManagementFlashing Back And Moving Forward On Spray Drift
May 3, 2016
The potential for pesticide drift remains an unavoidable feature of modern agriculture. Here, too, history repeats itself. “When Roundup debuted, Read More
Giant Ragweed
HerbicidesSurvey Provides Insights On Giant Ragweed In The Corn B…
May 2, 2016
A new survey published in the journal Weed Science offers insights into the distribution and management of giant ragweed, a Read More
Truck dumping dry fertilizer
FertilizerFertilizer Logistics Q&A: Southern States’ Joe Wlod…
May 2, 2016
Joe Wlodkoski, Director of Agronomy Procurement, Fertilizer, Southern States Cooperative, is a 40-plus year fertilizer industry veteran. He is quite Read More
Eric SfiligojReasons For Hope In Commodity Prices
May 2, 2016
For many months now, the doomsayers have ruled the day in agriculture. Too much supply with too little demand would Read More
West Central Dome structure
FertilizerFertilizer Logistics 2016: All Clear, So Far
May 1, 2016
After a relatively hairy early start to the spring fertilizer movement season with flooding in Louisiana and St. Louis, things Read More
BAICOR
CropLife 100BRANDT Acquires Utah Specialty Fertilizer Company
April 28, 2016
BRANDT, a leading agriculture retailer and manufacturer of specialty ag products, has acquired a majority interest in BAICOR, L.C. BAICOR, Read More
Soybean field
Industry NewsVerdesian Life Sciences Adds Vice President Of Business…
April 28, 2016
Verdesian Life Sciences has announced the addition of Marc Treurniet to the plant health and nutrition company’s management team. Treurniet Read More
ManagementBiotech Crops Developments and Millennials
April 28, 2016
Editors Eric Sfiligoj and Paul Schrimpf talk about the latest activities in biotech crops and a major shift in the Read More
Industry NewsNachurs-Alpine, Pathway Biologic Extend Marketing Agree…
April 28, 2016
Nachurs-Alpine Solutions (Marion, OH) and Pathway Biologic (Plant City, FL) announce an extension to their exclusive marketing agreement specific to Read More
MicronutrientsCharah Add Three Warehouses For SUL4R-PLUS Fertilizer
April 28, 2016
Charah, Inc., a total solutions company providing unparalleled service and innovation for the coal-fired power generation industry, announced today that Read More
Spenser Forgey, Yahama Fortix
FungicidesIndiana Farmer Wins Arysta LifeScience FORTIX Fungicide…
April 28, 2016
Arysta LifeScience North America recently presented Spenser Forgey, a grower from Young America, IN, with a new 2016 Yamaha Grizzly Read More
Corn Field
HerbicidesNew Wilbur‐Ellis Herbicide Targets Volunteer Corn
April 28, 2016
Wilbur‐Ellis Co., a recognized leader in marketing and distribution of crop protection products, as well as precision agriculture technology, has Read More
StewardshipNRCS To Help Farmers Measure Conservation Impacts On Wa…
April 27, 2016
The USDA has announced the availability of $2 million to help farmers install edge-of-field stations that monitor water quality as Read More