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
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

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

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.

Cotton Sprayer
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.

Cotton Sprayer
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.

Around The Gin
Product News

Falcon Adds Two New Automated Precision Soil Samplers

August 28, 2015

Falcon Soil Technology has added two new automated soil sampling systems to its product lineup.

Product News

HUMA GRO Adds New Boron Liquid Nutrient Formulation for Crops

August 28, 2015

BORO-MAX, a new boron 10 percent liquid nutrient formulation, is now available from HUMA GRO.

Product News

On-Farm Research Helps Ease Grower Questions About Enlist System

July 31, 2015

Southern cotton and soybean growers who have worked with the Enlist Weed Control System in on-farm research plots are now sharing their experiences.

Product News

Nufarm Introduces Panther SC Herbicide

July 24, 2015

Nufarm is introducing Panther SC herbicide, a new broad-spectrum herbicide for use in cotton and other Southern row crops.

Product News

USDA Deregulates Dow AgroSciences’ Enlist Cotton Trait

July 23, 2015

The USDA has deregulated Dow AgroSciences’ Enlist cotton trait in the United States.

Product News

Ratting Out Copper Theft

June 10, 2015

A simple alarm technology is helping to stop copper thieves who target irrigation systems.

Product News

EPA Approves New Premix for 2016 for Cotton, Soybean Weed Control

May 29, 2015

Cotton and soybean growers will have a new weed control option in 2016 with Warrant Ultra Herbicide, a premix of acetochlor and fomesafen.

Product News

Deltapine NPE Program Begins Eighth Year of On-Farm Variety Evaluation

April 28, 2015

Nearly 200 farmers will be part of the Deltapine New Product Evaluator program this year to help evaluate cotton variety candidates for the Deltapine Class of 16.

Latest News
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.

Planting

Choose the Right Mix for Spring Burndown

March 19, 2015

Judging by the phone calls he’s receiving, Tom Barber, University of Arkansas Extension weed scientist, says that burndown applications are at the top of growers’ priority lists.

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.