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
Top 100 Articles
Growmark Group
CropLife 100GROWMARK In 2015: Back, To The Future
March 2, 2015
The nation’s third largest ag retail organization is simultaneously moving forward while remembering its past. Read More
CropLife 100Pinnacle Expands Sanders Brand In The South
February 27, 2015
Pinnacle has acquired Hopkins Seed and Chemical in Qulin, MO, which expands the company's Sanders brand to nine Southern states. Read More
CropLife 100Pinnacle Launches New Providence Agriculture Location In Indiana
February 27, 2015
Pinnacle Agriculture Holdings — ranked No. 6 on the CropLife 100 — has established a new retail location in New Castle, IN, which will operate as part of Pinnacle's Providence Agriculture brand. Read More
CropLife 100Cooperative CHS Returns $518 Million To Owners
February 23, 2015
The 2015 cash return to owners is based on CHS net income of $1.1 billion, the company's second highest on record. Read More
corn field
CropLife 100The Andersons’ Humic DG Now Available In Canada
February 13, 2015
The Andersons, Inc. Turf & Specialty Group has announced its Humic DG product is now available to customers in the Canadian turf, agriculture and horticulture markets. Read More
Farmer on tablet
CropLife 100Southern States Co-op: An Inside Look At Our Aerial Imagery Program
February 8, 2015
Now is as good a time as any to explore the basics of what a retail aerial imagery program looks like today. Read More
Latest News
Prairieland FS employees
Eric SfiligojWorkforce Worries
March 2, 2015
Finding good employees almost always ranks as the No. 1 or No. 2 problem for ag retailers in our annual CropLife 100 survey. Read More
Growmark Group
CropLife 100GROWMARK In 2015: Back, To The Future
March 2, 2015
The nation’s third largest ag retail organization is simultaneously moving forward while remembering its past. Read More
CropLife 100Pinnacle Expands Sanders Brand In The South
February 27, 2015
Pinnacle has acquired Hopkins Seed and Chemical in Qulin, MO, which expands the company's Sanders brand to nine Southern states. Read More
CropLife 100Pinnacle Launches New Providence Agriculture Location I…
February 27, 2015
Pinnacle Agriculture Holdings — ranked No. 6 on the CropLife 100 — has established a new retail location in New Castle, IN, which will operate as part of Pinnacle's Providence Agriculture brand. Read More
Management2,4-D Celebrates 70 Years; GROWMARK Uses Super Bowl Ad …
February 27, 2015
Jim Gray, executive director of the 2,4-D Research Task Force, lays out planned activities to mark the chemistry’s 70th anniversary. Read More
HerbicidesUniversity Of Arkansas Flag The Technology Program Adds…
February 27, 2015
Started in 2010, the Flag the Technology program provides a visual reference for applicators to distinguish between fields planted with different herbicide-tolerant trait technologies. Read More
Luckey Farmers, Inc.’s Berkey Farm Center
Industry NewsLuckey Farmers’ Berkey Branch Certified In 4R Nut…
February 26, 2015
The 4R Nutrient Stewardship Certification Program has announced Luckey Farmers Inc.’s Berkey Farm Center in northwest Ohio has been added to its growing list of nutrient service providers to achieve certified status. Read More
Crop InputsWinField Unveiling NutriVision Technology, Ascend Dry F…
February 24, 2015
New for 2015 are NutriVision Technology, a unique tool for monitoring in-season plant nutrient availability, and Ascend WSG plant growth regulator, a new dry formulation of Ascend plant growth regulator. Read More
FertilizerNew Formulation Of NutriSphere-N Protects High Volume U…
February 24, 2015
Verdesian Life Sciences is launching NutriSphere-N HVTM, a new polymer formulation of the proven NutriSphere-N Nitrogen Fertilizer Manager that protects high-volume applications of UAN. Read More
EquipmentIowa Ag Secretary Northey Names Hagie Water Quality Lea…
February 24, 2015
Iowa Secretary of Agriculture Bill Northey has named Hagie Mfg. as a recipient of the Secretary’s Water Quality Initiative (WQI) Leader Award. Read More
FungicidesEvito Fungicide Gives Canadian Wheat Growers New Diseas…
February 24, 2015
EVITO fungicide from Arysta LifeScience North America gives Canadian wheat and barley growers a new option for disease control. Read More
Eric SfiligojThe Commodity Classic Turns 20
February 23, 2015
Two decades in, this annual gathering of all things agriculture has become a must-see event. Read More
CropLife 100Cooperative CHS Returns $518 Million To Owners
February 23, 2015
The 2015 cash return to owners is based on CHS net income of $1.1 billion, the company's second highest on record. Read More
ManagementCropLife Retail Week: On The Road Edition
February 20, 2015
Editors Paul Schrimpf and Eric Sfiligoj discuss their recent trips to the National Farm Machinery Show in Louisville and the Read More
Crop InputsLand O’Lakes Acquires FLM+ Assets
February 19, 2015
FLM+ will become a wholly owned subsidiary of Land O'Lakes, Inc., and the company will retain its employee base after closing of the deal, which is scheduled for the second quarter of the year. Read More
Seed/BiotechUnited Suppliers, Stine Seed Form Marketing Alliance
February 19, 2015
The new alliance will greatly expand sales opportunities for Stine Seed with the United Supplier Seed Link Owners. Read More
Crop InputsVilsack To Deliver Commodity Classic Keynote Address
February 19, 2015
The secretary will deliver a keynote address to several thousand farmers and ag allies during the event's General Session, to be held Friday, February 27, in Phoenix, AZ. Read More
Crop InputsSoybean Storage Tips
February 19, 2015
On-farm storage of soybeans requires some special considerations compared to corn. Read More