Reigning In Late Season Escapes

If anybody is qualified to discuss how to properly deal with glyphosate resistant Palmer amaranth, it’s Georgia Extension Specialist Dr. Stanley Culpepper. The resistant pigweed epidemic began in Georgia, due in part to a homogenous reliance on the same technologies in weed control. After three years of suffering from the destructive pigweed, Culpepper and Georgia are still fighting an uphill battle.

“Back in 2005, we probably had 3,000 to 5,000 acres of agronomic land infested with glyphosate resistant Palmer amaranth. By the end of 2007, we’re looking at a minimum of 300,000 acres,” Culpepper says. Though Georgia’s growers have taken a hard financial hit because of the resistance epidemic, Culpepper credits their determination in fighting against the weeds. In order to keep other areas of the cotton belt from facing a similar struggle, he issues a stern warning.

“We’re in a boat that’s already set sail. We’ve got a disaster; we’re having to deal with it. You don’t necessarily have to get in that boat with us, but it’s up to you. If you’re going to ignore the situation, pretend the situation doesn’t exist, and continue to just spray Roundup, you will join us.”

Understandably, Culpepper advocates that growers study their chemistries in order to diversify and better manage resistance. In order to rotate chemistries effectively, growers must understand how they differ from each other. He does recommend specific herbicides.

“If you’re a cotton producer in our state, you need a residual herbicide at planting, early post and at layby. Residual, residual, residual is what you need, and we’ve got to pray for timely rain on the dryland production,” he says. “The three most effective residual herbicides for Georgia cotton producers include Reflex, Valor and Staple (where ALS-resistance is not present).”

Culpepper says that in Georgia, layby directed application mixes of diuron and MSMA, or diuron combined with MSMA and Valor were common in 2008. Hooded applications of Gramoxone plus diuron were also common. While late-season action is sometimes futile, Culpepper’s advice on managing escapes is simple: yank them out before seed production and seed rain occur.

Hand pulling is often the only option to remove escapes after layby, according to Culpepper, because once glyphosate becomes powerless against the plants, pigweeds larger than approximately 6 inches are too tough for other chemical options to handle.

Dr. Alan York, of North Carolina State University, also recommends residual herbicides as the primary weapon against resistance, though he says that preplant and preemergence is the time span when they are most effective. “If you miss it preemergence, you have missed it for the season,” York says. As for late-season escapes, both experts agree that the basic action of hand pulling pigweed is an effective way to handle the problem.

“If you think you don’t have a resistance problem, but you see one plant out there after applying Roundup, you’re a fool if you don’t go pull it,” York says.

Add 3 photos to captions:
Stanley Culpper
Alan York
By 2007, glyphosate-resistant Palmer amaranth had infested around 300,000 acres in Georgia.

Leave a Reply

Weed Control Stories
Insect Control

Genome Mapping Signals Brighter Days for U.S. Cotton

December 6, 2014

At a time when growers rely increasingly more on genetic advancements in yield and fiber quality to keep cotton economically viable, cotton breeders and researchers are excited about the possibilities that genome mapping brings to variety and trait development.

Weed Control

March is Burndown Time for NC Cotton Fields

March 3, 2015

NC State cotton specialists have provided online guidelines for timing, products and rates for spring burndown of problem weeds on cotton acres.

Product News

Brake Herbicide Receives Section 18 Approvals in Six States

February 18, 2015

Brake Herbicide has received Section 18 emergency use exemptions for control of glyphosate-resistant Palmer amaranth in six cotton producing states.

Product News

USDA Deregulates Dicamba-Tolerant Technologies for Cotton and Soybeans

January 16, 2015

The USDA has announced its decision to deregulate Bollgard II XtendFlex cotton and Roundup Ready 2 Xtend soybeans – Monsanto’s dicamba-tolerant trait technologies for those crops.

Product News

Monsanto and FMC Renew and Broaden Crop Protection Agreement

January 8, 2015

Monsanto and FMC have agreed to extend and broaden their current relationship to help benefit cotton, corn and soybean growers through Roundup Ready PLUS Crop Management Solutions.

News

Details from Summit on “Wicked” Herbicide Resistance Problem Now Available Online

October 21, 2014

Slides and a webcast of the Weed Science Society of America’s scientific summit on herbicide resistant weeds are now available for free online.

Crop Inputs

Consider Options for Fall Herbicide Applications

October 7, 2014

Growers who may be considering fall herbicide applications for anything other than Italian ryegrass may want to rethink their options.

Around The Gin
Product News

New Cheminova Chemistry to Help Control Herbicide Resistant Weeds

February 23, 2015

Cheminova plans to register pethoxamid, a new herbicide active ingredient, to help growers manage herbicide-resistant weeds.

Product News

Brake Herbicide Receives Section 18 Approvals in Six States

February 18, 2015

Brake Herbicide has received Section 18 emergency use exemptions for control of glyphosate-resistant Palmer amaranth in six cotton producing states.

Precision Technology

TeeJet Matrix 430 Provides Simple, Easy-to-Use Guidance

February 18, 2015

TeeJet Technologies’ new Matrix 430 GNSS guidance system is ideal for a wide range of field applications.

Precision Technology

TeeJet Launches RX520 High-Precision GNSS Receiver

February 17, 2015

TeeJet Technologies has introduced the RX520 dual frequency GNSS receiver for precision farming operations.

Disease Control / Nematodes

Velum Total Approved for Cotton, Peanuts in 2015

February 12, 2015

Bayer CropScience has received registration for Velum Total, a new insecticide/nematicide for use in cotton and peanuts in 2015.

Disease Control / Nematodes

EPA Approves TOPGUARD Terra for Cotton Root Rot Control

February 6, 2015

TOPGUARD Terra fungicide from Cheminova has received EPA registration for control of cotton root rot.

Product News

Deltapine to Release Five Bollgard II XtendFlex Cotton Varieties

January 27, 2015

Following USDA deregulation of the Bollgard II XtendFlex cotton technology, Deltapine has announced plans to offer five new B2XF varieties for the 2015 season.

Product News

Bollgard II XtendFlex Cotton Poised for Limited Introduction

January 21, 2015

A limited introduction of Bollgard II XtendFlex cotton varieties is planned for the 2015 planting season through Deltapine and select licensees.

Latest News
Weed Control

March is Burndown Time for NC Cotton Fields

March 3, 2015

NC State cotton specialists have provided online guidelines for timing, products and rates for spring burndown of problem weeds on cotton acres.

Insect Control

Genome Mapping Signals Brighter Days for U.S. Cotton

December 6, 2014

At a time when growers rely increasingly more on genetic advancements in yield and fiber quality to keep cotton economically viable, cotton breeders and researchers are excited about the possibilities that genome mapping brings to variety and trait development.

Weed Control

Georgia Growers Lay the Blueprint for Pigweed Control

December 3, 2014

It makes sense for Georgia – the first state to confirm glyphosate resistant pigweed – to be one of the first places for the investment in pigweed control to begin visibly paying off.

News

Details from Summit on “Wicked” Herbicide Resistance Problem Now Available Online

October 21, 2014

Slides and a webcast of the Weed Science Society of America’s scientific summit on herbicide resistant weeds are now available for free online.

News

USDA Announces Measures to Help Farmers Diversify Weed Control Efforts

October 16, 2014

USDA has announced several new steps to help address the increase of herbicide resistant weeds in U.S. agricultural systems.

Crop Inputs

Consider Options for Fall Herbicide Applications

October 7, 2014

Growers who may be considering fall herbicide applications for anything other than Italian ryegrass may want to rethink their options.

Crop Inputs

National Summit on Herbicide Resistant Weeds Set for September 10

August 31, 2014

The Weed Science Society of America will conduct a national scientific summit on herbicide resistant weeds in Washington, D.C., on September 10, including a live webcast of the event for those unable to attend in person.

Crop Inputs

Ramping Up the Outreach for Enlist Technology

August 29, 2014

Dow AgroScience is ramping up outreach and education efforts to make sure cotton producers are ready for the introduction of the Enlist Weed Control System for cotton in 2016, pending regulatory approval.

Crop Inputs

Planting Intentions for 2015 Impact Aerial Sowing of Fall Cover Crops for Weed Control

August 26, 2014

Tennessee Extension Weed Specialist Larry Steckel says there’s a lot of interest in aerial seeding of cover crops into standing crops this fall to help with weed suppression next spring.

Crop Inputs

Zidua Herbicide Now Labeled for Residual Weed Control at Layby

July 18, 2014

BASF has issued a supplemental label for use of Zidua herbicide in post-directed layby applications for weed control in cotton.

Crop Inputs

Help Manage Pigweed with Hoods and Post-Direct Applications

July 3, 2014

Management of Palmer amaranth is possible in cotton with careful use of hooded sprayers and other post-directed herbicide applications.

Crop Inputs

Tech Centers Offer Southern Growers a Look at Enlist Weed Control System

June 27, 2014

Dow AgroSciences is more than tripling the number of field training locations this summer to demonstrate the Enlist Weed Control System and other company products.

Crop Inputs

Pigweed Management Strategies Following Mid-South Rains

June 13, 2014

Frequent flooding and hard rains throughout the upper Mid-South have made it virtually impossible for growers to spray Palmer amaranth as timely as needed.

Crop Inputs

Patience Is a Virtue in Technology Development

June 3, 2014

Companies often wait more than a decade before seeing their new research ideas in the commercial market.

Crop Inputs

New Focus on Cotton Webcasts Detail High-Yield Fertilization, Palmer Amaranth Control

May 21, 2014

New webcasts on fertilization and on management of Palmer amaranth have been added to the Focus on Cotton series from the Plant Management Network and Cotton Incorporated.