Recognizing Resistance

Recognizing the presence of herbicide-resistant weeds and formulating a total management plan is becoming more important than ever.

With herbicide-resistant weeds spreading, growers everywhere are reportedly becoming better at identifying resistant weeds in their fields.

“In prior years it was always the guy down the road with the problem,” says Tony VanOverschelde, agronomy manager, CHS Eastern Farmers, Brandon, SD. “But once you recognize that resistance exists, you’ve got to adjust your practices to the situation. This isn’t a problem that’s going away anytime soon.”

Waterhemp in the Midwest
Dr. Kevin Bradley, associate professor, University of Missouri Extension, strongly recommends residual herbicides for resistant weeds, especially waterhemp.

Thus, a need remains for enlightening growers. “We’re going to have to start re-educating some growers,” says Jeff Nagel, agronomist, Ceres Solutions, Terre Haute, IN. “It’s really a shift toward a more ‘systems approach’ to weed management.”

Get With The Program

Identifying and confirming resistance right now is really a five-to-six month process, says weed scientist Dr. Kevin Bradley, associate professor, University of Missouri Extension. Once resistance is confirmed, he says the management recommendations will likely differ from field-to-field.

“Generally speaking, my first recommendation is to rotate to some other type of herbicide program, away from just straight glyphosate,” says Bradley. “Right now residuals are the number one thing I recommend, especially when it comes to waterhemp.”

Waterhemp is a big problem this year in some southern areas of the Dakotas and southeast Minnesota, according to VanOverschelde. Getting out in front of the problem before it becomes unmanageable is the most successful strategy, he says.

“We’ve figured out that if the farmer has some type of resistance, the following year we stress not to try to save money on the front end,” VanOverschelde says. “You’ve got to hit it right the first time, because if you get behind the eight-ball on this you can’t catch back up.”

Nagel has three problem weeds that he’s helping growers fight: Marestail, waterhemp and Palmer amaranth (pigweed).

“Marestail is going to take a systems approach where we start with a fall herbicide program, control the emerged marestail and then burndown again in the spring with a control herbicide,” he says. “With waterhemp, which we are getting more calls on this season than ever before, we’re encouraging farmers to use a residual herbicide in the spring, and/or layer residual herbicide in-crop. We’ve got to give the glyphosate some more help.”

Palmer amaranth is, as Nagel puts it, “a game-changer for us” because the first confirmed presence of the pest occurred just last year. However, he believes that pigweed has been present in Indiana for the past few years, it’s just been routinely misidentified as waterhemp during that time.

“Palmer amaranth is just a bad actor — it’s a pretty big seed producer, and we have herbicides in corn that can control it — but Roundup Ready soybeans had some troubles this year,” he says. “We’re actually putting some programs together for next year and one of the strategies is going to be having two residuals involved. You put a residual down at planting time and then you spray postemergence. Then you follow that with another residual so you get multiple flushes of it.”

Other useful tools on the horizon are the dicamba and 2,4-D cropping systems, according to Nagel.

“Unfortunately, the dicamba system that we thought we were going to have for 2014 is delayed,” he says. “Now, Roundup still works for us fairly well, as we are getting efficacy on the majority of the weeds. But there are areas where we are having problems and we’re trying to be proactive by telling growers ‘if glyphosate still works for you, then great, but you need to start using a residual and quit relying on glyphosate alone.’”

Topics:

Leave a Reply

Weed Resistance Stories

Weed ResistanceWeeds: The Fearsome Five
October 1, 2013
Although there are currently dozens of weeds that show some kind of resistance to herbicides, these five are the most troublesome. Read More
Weed ResistanceWeed Management Program Profiles
October 1, 2013
Here’s quick look at weed control strategies and their cost. Read More
Weed ResistanceRecognizing Resistance
October 1, 2013
Recognizing the presence of herbicide-resistant weeds and formulating a total management plan is becoming more important than ever. Read More
Mature Waterhemp in Corn
Weed ResistanceWhen Weed Control Goes Wrong
October 1, 2013
Beyond the possibility of resistance developing, ineffective control exacts cost to growers in lost yield. Read More

Trending Articles

CropLife 100Agrium To Cut 500 Jobs, Sell Some Businesses
November 11, 2014
Among the businesses Agrium will try to sell are its micronutrients and European UAN (urea-ammonium nitrate) lines. Read More
HerbicidesMonsanto, Sumitomo Chemical And Valent Extend Crop Protection Collaboration
November 10, 2014
The agreement extends their strategic partnership in Monsanto’s Roundup Ready PLUS Crop Management Solutions platform for soybeans and cotton in the U.S. Read More
FertilizerCorn Rootworm Hybrids And Potassium Uptake
November 4, 2014
To achieve successful yields, grower-customers can’t afford to cut back on their potassium use with corn rootworm hybrids, say experts. Read More
StewardshipResponsibleAg Begins Auditor Training
October 31, 2014
ResponsibleAg auditor training is now underway at the Ford B. West Center for Responsible Agriculture in Owensboro, KY. Read More
InsecticidesNew Research Study Shows The Value Of Neonics
October 29, 2014
The study evaluated seed treatment, soil and foliar uses of neonicotinoid insecticides in the U.S. and Canada. Read More
Crop InputsPlatform Specialty Products To Acquire Arysta LifeScience
October 20, 2014
Once the acquisition is complete, Platform Specialty Products will combine Arysta LifeScience with previously acquired companies Agriphar and Chemtura Crop Solutions. Read More

Latest News

EquipmentAGCO Announces Operator Of The Year Finalists
November 20, 2014
Four custom applicators have been selected by AGCO Application Equipment as finalists for 2014 Operator of the Year, an honor that recognizes them as being among the top professionals in their industry throughout North America. Read More
MicronutrientsH.J. Baker Expands Tiger-Sul Business
November 20, 2014
H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
soybean field
FertilizerGeneral Mills Honors United Suppliers For Nitrogen Opti…
November 19, 2014
United Suppliers winning proposal detailed SUSTAIN, a consulting network that provides customized products and services for farmers using a needs-based system approach. Read More
EmployeesOhio AgriBusiness Association Awards $25,000 In Scholar…
November 19, 2014
Each year, the Ohio AgriBusiness Association Educational Trust scholarship program awards scholarship dollars to students enrolled in an agriculture-related field attending several state colleges. Read More
ManagementServi-Tech Names New CEO
November 17, 2014
Servi-Tech has named Greg Ruehle its new president and CEO. Read More
CropLife 100Pinnacle Ag Acquires Colorado Aerial Application Outlet
November 17, 2014
Ft. Lupton, CO-based Reck Aviation — a full-service chemical application company providing aerial crop applications of fertilizers and crop protection products — will operate as part of Pinnacle's AgOne Application Services brand. Read More
Eric SfiligojMcDonald’s Message: Biotech Crops Scarier Than Cancer
November 17, 2014
Despite their potential health benefits, one of the world’s largest potato users will pass on a new biotech offering. Read More
MicronutrientsWinField Releases 2014 NutriSolutions Results
November 14, 2014
A number of significant regional and national crop deficiency trends emerged from the 2014 WinField NutriSolutions tissue sampling program. Read More
FertilizerH.J. Baker Opens Chinese Production Lines
November 14, 2014
The occasion was the official launch of the Tiger-Sul sulphur Bentonite production line of two much anticipated fertilizer products in China, T90CR sulphur fertilizer and TZinc micronutrient enhanced sulphur fertilizer. Read More
ManagementOhio Certified Crop Adviser Program Accepting Nominatio…
November 14, 2014
The award recognizes an individual who delivers exceptional customer service for farmer clients in nutrient management, soil and water management, integrated pest management and crop production in Ohio. Read More
HerbicidesSyngenta Announces Acuron Trial Plot Results
November 14, 2014
Acuron was tested at 167 trial locations across 35 states. Trials included 95 Syngenta locations, 54 university locations and 18 distributor locations. Read More
Crop InputsVerdesian Expands Sales Force
November 13, 2014
The new sales representatives will work with growers, retail partners and distributors to oversee technical training and product education. Read More
EquipmentAGCO Raises $100K For Wounded Warrior Project
November 13, 2014
AGCO Corp. partnered with local AGCO dealers across the U.S. and Canada to raise nearly $100,000 in support of wounded service veterans. Read More
HerbicidesDow AgroSciences Announces Launch Of Enlist Duo Herbici…
November 12, 2014
It will be launched in conjunction with a stewarded introduction of Enlist corn, and seed production of Enlist soybeans in 2015. Read More
FertilizerH.J. Baker Expands Tiger-Sul Business
November 12, 2014
Agricultural firm H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
Blenders13 Fertilizer Blenders For 2015
November 12, 2014
Dealers can find a fertilizer blender to deliver any speed, volume and custom mix they want. Read More
CropLife 100Wilbur-Ellis Vice President Receives Honorary FFA Award
November 11, 2014
Jim Loar, vice president of operations of Wilbur-Ellis’ Agribusiness Division, was awarded the Honorary American FFA Degree at the 2014 National FFA Convention and Expo in Louisville, KY. Read More
FertilizerBASF Makes Limus Nitrogen Management Available In U.S.
November 11, 2014
Reducing ammonia losses by more than 90%, Limus nitrogen management has demonstrated increased crop yields on average of 6%, according to 2013 replicated research. Read More