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

Herbicides2015 ASA Trials Demonstrate Valent Fierce XLT Herbicide’s Performance
February 2, 2016
Valent U.S.A. today announced that new Fierce XLT Soybean Herbicide ranks in the top tier among growers for length of Read More
HerbicidesMonsanto Takes Legal Action To Prevent Flawed Listing Of Glyphosate Under California’s Prop 65
January 22, 2016
Monsanto Co. is taking legal action to prevent a flawed listing of the herbicide glyphosate under California’s Proposition 65 (Prop Read More
Crop Protection Products in storage
HerbicidesREUTERS: Europe Food Safety Official Wades Into Glyphosate Safety Debate
January 14, 2016
The head of Europe’s food safety watchdog has written to a group of nearly 100 senior scientists strongly rejecting their Read More
Resicore herbicide
HerbicidesDow AgroSciences Receives EPA Registration For Resicore Herbicide
January 11, 2016
The U.S. EPA has approved the registration of Resicore herbicide, which will be available to growers for the 2016 growing Read More
Top 100 Articles
Elburn Cooperative
CropLife 100Elburn Cooperative Members Vote To Join CHS
December 28, 2015
With 81% of eligible producers voting, 94% cast an affirmative ballot for Elburn Cooperative, a diversified agricultural retailer based out Read More
West Central Cooperative, Jefferson, IA
CropLife 100Farmers Cooperative-West Central Merger Approved
December 21, 2015
The members of Farmers Cooperative Co. (FC), Ames, IA, and West Central Cooperative, Ralston, IA, have both approved the merger Read More
Wheat Growers Innovation Center, Bath, SD
CropLife 100Wheat Growers Opens Innovation Center
December 21, 2015
Wheat Growers’ commitment in providing its farmer-owners with the latest in technological advancements now has a one-of-a-kind focal point, as Read More
CropLife 100ARA Selects The Andersons As 2015 Retailer Of The Year
December 9, 2015
The Agricultural Retailers Association today named Maumee, OH-based The Andersons as its Retailer of the Year for 2015. The award Read More
CPS Washington Court House John Deere Sprayer
CropLife 100Application Equipment Report: It Is Easy Being Green For Top 100 Ag Retailers
December 5, 2015
On The Muppets television show, Kermit the Frog is famous for singing a song about the troubles he encounters in Read More
Fertilizer Bin
CropLife 100Fertilizer Sales: Another Down Year For Top 100 Ag Retailers
December 4, 2015
In pure number terms, the fertilizer category still dominates all crop inputs/services among CropLife 100 ag retailers. In 2015, for Read More
Latest News
Crop InputsBayer Contests EPA’s Decision On Valuable Insecticide F…
February 5, 2016
Crop Science, a division of Bayer, has announced it has refused a request by the Environmental Protection Agency (EPA) to Read More
Wheat Field North Dakota
Seed/BiotechSyngenta Wins Seed Fraud Suit Against South Dakota Grow…
February 5, 2016
Syngenta has obtained a $25,000 settlement from Paul and John Mayclin, Mayclin Farms, Plankinton, SD, in response to their Plant Read More
ManagementOABA Annual Conference Wraps Up In Columbus
February 5, 2016
More than 300 Ohio AgriBusiness Association (OABA) members and industry professionals were on hand to engage in collaborative learning and Read More
Crop InputsBayer To Contest EPA Flubendiamide Decision
February 5, 2016
Crop Science, a division of Bayer, announced today it has refused a request by EPA to voluntarily cancel the uses Read More
Syngenta
Seed/BiotechNot So Fast: ChemChina Syngenta Takeover Could Draw Nat…
February 5, 2016
State-owned China National Chemical Corp. (ChemChina), which plans to buy Swiss seeds and pesticide maker Syngenta, will promptly start preparations Read More
Rendering of Syngenta Seedcare Institute expansion
Seed/BiotechExpansion Of Syngenta’s North America Seedcare In…
February 4, 2016
As demand for seed treatment knowledge and products grows among farmers, retailers and others in the seed industry, Syngenta is Read More
Soybean Field
Industry NewsArysta LifeScience Strengthens Sales Team
February 4, 2016
Arysta LifeScience North America recently announced three new personnel additions: Jake Cook and Peter White are Territory Sales Managers for Read More
Davor Pisk Syngenta COO
Crop InputsSyngenta COO: Why ChemChina Offer Beat Monsanto’s
February 4, 2016
Syngenta Chief Operating Officer Davor Pisk says he is confident the proposed acquisition by ChemChina will ultimately help preserve choice Read More
Young corn plants in soil
Crop InputsKoch Biological Solutions Invests In Pathway Biologic
February 4, 2016
An affiliate of Koch Biological Solutions, LLC has acquired a minority equity position in, and entered into collaboration with, Pathway Read More
Crop InputsABG: China Signs Off On Monsanto’s Roundup Ready …
February 3, 2016
Monsanto Co. on Wednesday announced it plans to launch its Roundup Ready 2 Xtend soybeans in time for the 2016 Read More
Syngenta headquarters in Basel, Switzerland
Crop Inputs6 Things To Know About The ChemChina-Syngenta Deal
February 3, 2016
After months of rumors and speculation, Syngenta has announced that ChemChina has offered to acquire the Swiss-based company. “In making Read More
FertilizerPhosphorus: Is Band Or Broadcast Application The Better…
February 3, 2016
Is band or broadcast application the better method when it comes to phosphorus? The answer to this question depends mostly Read More
Syngenta Sign
Crop InputsChemChina Nearing Deal To Buy Syngenta For Record $43 B…
February 3, 2016
China National Chemical Corp. is nearing an agreement to buy Swiss pesticide-and-seeds-maker Syngenta AG for about 43.7 billion francs ($42.8 Read More
Herbicides2015 ASA Trials Demonstrate Valent Fierce XLT Herbicide…
February 2, 2016
Valent U.S.A. today announced that new Fierce XLT Soybean Herbicide ranks in the top tier among growers for length of Read More
Crop Protection Products in storage
Paul SchrimpfCrop Input Selling: Return Of The Price List
February 2, 2016
It was a good 15 years ago, shortly after I first started writing for this esteemed publication, that it all Read More
Potash storage at Growmark
FertilizerThe Phosphate And Potash Outlook For 2016
February 2, 2016
Like other commodities, prices of the leading plant nutrient products dropped sharply in 2015. At this writing, the price of Read More
Chesapeake Bay
StewardshipKeeping A Watch On Water Issues
February 2, 2016
During a down cycle in the market, it’s difficult to think about investing for the long term. For retail businesses, Read More
Young Corn Plants
FertilizerNutrient Considerations For Low Corn Prices
February 2, 2016
Corn prices are low and many producers are asking tough questions about their nutrient management programs. Here are some suggestions Read More