A Two Pronged Approach to Weed Resistance Management

Crop Consultant Charles Rogister

Consultant Charles Rogister

Weed resistance, especially to glyphosate, is a real and growing threat to U.S. agriculture. And in North Carolina, this threat is already a stark reality. Per a study published in the Journal of Cotton Science,it is conservatively estimated that glyphosate-resistant Palmer amaranth occurred on at least 185,000 acres in North Carolina in 2008 and infests 22 counties including Pitt, home to Crop Consultant Charles Rogister of Crop Production Services.

Rogister became concerned a few years back when he noticed glyphosate wasn’t providing the level of control it once had on tough weeds like Palmer amaranth. He started researching the issue and consulted with his county extension agent, Sam Uzzell. In 2007, Uzzell invited Alan York, former North Carolina State University William Neal Reynolds Professor of Crop Science and Extension Specialist, to speak at a county grower meeting. York discussed the impact weed resistance was already having on the region and how that impact would escalate unless preventive measures were taken.

“At that meeting, York hit home the fact that we need to take care of the problem now before it gets worse. I think his warnings really opened the eyes of some growers in this area and helped to get the point across that we needed to take action,” said Rogister.

Keys to Success

Rogister stresses to his customers that there are two key components in managing resistance. One of those is alternate mode of action. “Growers need to change up the mode of action, not just the brand,” said Rogister.

The second component to weed management for Rogister is to be timely with herbicide applications. “Resistant or not, if you spray pigweeds that are too large, nothing is going to work like it’s supposed to,” said Rogister. “It is so important to control weeds early, when they are small.”

Pre-emergence, residual herbicides help control weeds early in the season to protect crop yield potential, even in glyphosate-tolerant crops. And, these herbicides provide other modes of action besides glyphosate.

“When weeds are sprayed with a single herbicide mode of action again and again, then those plants that tolerate that herbicide are selected and enrich the following generation with genes that can tolerate the herbicide. Once a weed population develops resistance, they ‘remember’ they are resistant,” said Chuck Foresman, manager of weed resistance strategies for Syngenta Crop Protection, Inc. “Rotating crops and using more than one mode of action for weed control reduces the chances for resistance to develop. And, if a weed is resistant to one mode of action, another mode of action may control it.”

Building a Strategy

Growers need to be prepared to fight glyphosate resistance with the tools they currently have available, according to Foresman. “Unfortunately, some believe that chemical companies are going to develop a new herbicide mode of action to alleviate glyphosate resistance before it becomes a bigger problem,” said Foresman. “But if we found a new mode of action today, it would take at least ten years to get it to market. We need to be looking at the herbicide programs and strategies available today, and make the best use of those tools.”

Rogister evaluated the tools available and developed a weed management strategy that has helped growers in his region combat this issue.

“For cotton, we went with glyphosate and 2,4-D at burndown and then came back with Reflex herbicide broadcasted behind the planter,” said Rogister. “I recommend that everybody broadcast since we have such a problem with these pigweeds. We applied glyphosate and Dual Magnum herbicide in the first over-the-top application.”

Rogister plans to continue these recommendations for the 2009 season based on the successes his customers have had in both controlling resistant weeds and minimizing the spread of resistance. As a true pioneer in the implementation of weed resistance management strategies in eastern North Carolina, Rogister has inspired many growers in the region to take the steps necessary to manage resistance and protect yields.

Topics:

Leave a Reply

Weed Control Stories
Weed Control

How to Manage PPO Resistant Pigweed in Cotton

February 4, 2016

Mississippi State Extension specialists say managing Palmer amaranth with multiple resistance to glyphosate, ALS and PPO herbicides will be complicated, but not impossible.

Weed Control

Post-Harvest Field Prep Can Reduce Weed Problems at Planting

October 27, 2015

As growers look across their harvested fields, they should be thinking about what’s needed to get ready for 2016 plantings.

Weed Control

Enlist Cotton Gets the Greenlight

September 7, 2015

When USDA deregulated Dow AgroSciences’ Enlist cotton trait system in late July, company representatives breathed a sigh of relief…and started gearing up for the “fun part.”

Weed Control

Cover Crop Considerations for This Fall

August 26, 2015

Growers should plan now for fall cover crops to help improve control of herbicide-resistant Palmer amaranth in next year's row crops.

Weed Control

Rain-Fed Weeds in Cotton Need Mid-Season Control

August 7, 2015

The early season rainfall in Texas has caused high weed pressure in cotton throughout the state, especially in the Rolling Plains.

Weed Control

Time to Clear Pigweeds from the Field

July 14, 2015

Now that most weed control treatments are ending, it’s time to look for ways to effectively hand weed and remove surviving pigweed plants from the field.

Weed Control

Rains Create Texas-Sized Weed Challenges

June 30, 2015

Drought-busting rains in May have created a mixed bag for cotton – and weed control – across Texas.

Around The Gin
Product News

New FieldView Drive Provides Real Time Field Data Transfer

January 26, 2016

The Climate Corporation is launching FieldView Drive, a device that provides seamless transfer of real time field data and mapping from planting or harvesting equipment to a mobile device.

Product News

PhytoGen Releasing First Enlist Cotton Variety for 2016

January 13, 2016

PhytoGen is releasing PHY 490 W3FE, the first cottonseed variety with the Enlist cotton trait, for the 2016 growing season.

Product News

Enlist Cotton Ready to Launch for 2016

January 6, 2016

Dow AgroSciences announced that cotton growers will have access to the Enlist cotton technology in 2016.

Product News

Bayer Announces New 2016 FiberMax and Stoneville Cotton Varieties

January 5, 2016

Bayer has announced the release of three new FiberMax and Stoneville varieties for 2016, all featuring the company’s GlyTol, LibertyLink and TwinLink technologies.

Product News

Deltapine Announces Class of 16 Varieties

December 14, 2015

Four new Bollgard II XtendFlex cotton varieties make up the recently announced Deltapine Class of 16.

Product News

PhytoGen Varieties Raise Standards for Yield and Quality

November 30, 2015

Growers propelled two PhytoGen brand varieties toward the top of the 2015 USDA Cotton Varieties Planted report.

Product News

2016 Seed Showcase – All-Tex and Dyna-Gro

November 16, 2015

Sister cottonseed companies are working to extend their footprint in 2016.

Product News

2016 Seed Showcase – CROPLAN

November 16, 2015

Up-and-coming CROPLAN relies on careful variety evaluation and placement strategies for growth.

Latest News
Weed Control

How to Manage PPO Resistant Pigweed in Cotton

February 4, 2016

Mississippi State Extension specialists say managing Palmer amaranth with multiple resistance to glyphosate, ALS and PPO herbicides will be complicated, but not impossible.

Weed Control

Producers Embrace Diverse Herbicide Programs

December 8, 2015

While growers wait on regulatory approval of new options, residual herbicides become increasingly important.

Weed Control

EPA Reconsidering Enlist Duo Registration; Dow Responds

November 27, 2015

Citing “new information regarding potential synergistic effects between the two ingredients on non-target plants,” EPA is reconsidering the registration of Dow AgroSciences’ Enlist Duo herbicide for corn, soybeans and cotton.

Weed Control

Post-Harvest Field Prep Can Reduce Weed Problems at Planting

October 27, 2015

As growers look across their harvested fields, they should be thinking about what’s needed to get ready for 2016 plantings.

Weed Control

Enlist Cotton Gets the Greenlight

September 7, 2015

When USDA deregulated Dow AgroSciences’ Enlist cotton trait system in late July, company representatives breathed a sigh of relief…and started gearing up for the “fun part.”

Weed Control

Cover Crop Considerations for This Fall

August 26, 2015

Growers should plan now for fall cover crops to help improve control of herbicide-resistant Palmer amaranth in next year's row crops.

Weed Control

Rain-Fed Weeds in Cotton Need Mid-Season Control

August 7, 2015

The early season rainfall in Texas has caused high weed pressure in cotton throughout the state, especially in the Rolling Plains.

Weed Control

Time to Clear Pigweeds from the Field

July 14, 2015

Now that most weed control treatments are ending, it’s time to look for ways to effectively hand weed and remove surviving pigweed plants from the field.

Weed Control

Rains Create Texas-Sized Weed Challenges

June 30, 2015

Drought-busting rains in May have created a mixed bag for cotton – and weed control – across Texas.

Weed Control

Mixing Up the Right Solution for Weeds

June 2, 2015

Proper use of tankmixes – and maybe a sharp hoe – are musts for summer weed control.

Weed Control

Cotton Injury from Post-Applied Residuals in Wet Conditions

May 28, 2015

Herbicide burn on cotton may be more likely in three-way post-applied applications, especially when soils are wet.

Weed Control

Lack of Pre Herbicide Activation Could Complicate Post Treatments

May 7, 2015

Recent dry weather and the rush to plant cotton are raising questions about managing weed control.

Planting

Late Cotton Burndown Strategies

April 15, 2015

With cotton planting set to begin soon, many growers are looking for burndown options for their cotton acres.

Weed Control

Specialists Outline Resistant Weed Management Strategies for NC

April 14, 2015

Growers need to remember that even when cotton prices are relatively low, there are no cutting corners when it comes to managing resistant weeds.

Planting

Enlist Joins the Flag the Technology Program

April 7, 2015

Dow AgroSciences plants its flag to help avoid mis-applications among herbicide technologies.