Control Weeds Next Year … By Starting This Year

There have always been two objectives to weed control. The first is obvious: keeping weeds from taking moisture and nutrients from this year’s cotton. The second is less obvious, but equally important: keeping weeds from going to seed and affecting next year’s crop.

A weedy field this year is more apparent and more immediate, but in this age of growing resistance to herbicides, it is increasingly important to control weeds and keep them from going to seed.

The situation is best exemplified in the Palmer amaranth species of pigweed that has developed resistance to glyphosate in some areas.

“Morningglory is our most common weed and it’s the driving force behind the use of ET at layby, but the resistant amaranth is the one we need to watch for,” says Dr. Stanley Culpepper, Georgia Extension agronomist. “Each resistant weed that makes it to harvest can shed thousands of seeds, and those seeds can stay in the soil for years.”

ET is a broad-spectrum herbicide from Nichino America.

Digging in the Dirt

There are herbicides that are still effective against resistant pigweed, but in some cases growers have resorted to digging up weeds by hand. “We have a little bit of that here,” says Howard Cross, a cotton grower in Pinehurst, GA. “We’ve had to go out and dig up a few glyphosate-resistant weeds by hand.”

Not everyone has to go that far, says Culpepper. His specific recommendations are available at www.gaweed.com, or at Georgia Extension offices.

Every weed has the potential to develop resistance, and within each species is enough genetic diversity to ensure that at least a percentage will be naturally resistant to a particular herbicide. If those weeds are allowed to survive, they can pass the resistance on to the next generation.

Doing a solid job at burndown, including a second if-necessary burndown application, is the way to start an effective resistance management program. After that, it’s back to basics – using a residual herbicide at planting and a post-directed herbicide at layby.

ET Phone Home

ET at burndown, postemergence or at layby is an excellent tank-mix partner if a grower has bindweed, morningglory, lambsquarter or pigweed in his field, says Ricky Sloan, of Helena Chemical in Moultrie, GA. “ET does a good job on those weeds, plus it heats up the tank mix,” he says.

Sloan avoids Roundup altogether at layby and recommends 1 quart of MSMA, 0.5 to 0.75 ounces of ET per acre, and a quart of mentholated seed oil per 100 gallons of water. If growers want to add a residual herbicide, he recommends adding a quart of diuron per acre. Sloan says these tank-mixes combine the strengths of each herbicide, while avoiding overuse of glyphosate.

The goal is to have a clean field at harvest so that weeds don’t go to seed. Ideally, after layby the canopy will closes and weed seed cannot germinate. But in dry years, canopies may not close and late-season weeds can cause problems.

If that’s the case, then ET can again provide some options. “ET is also registered as a defoliant, so if I see any morningglory, I add ET to the tank mix,” says Cross. “It gives good defoliation, and it keeps the morningglories from going to seed.

Editor’s note: Some information for this story was provided by Nichino America.


Add 2 photos to captions:
Ricky Sloan
Palmer amaranth produces millions of seed.

Leave a Reply

Weed Control Stories
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.

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.

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.

Around The Gin
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.

Product News

EPA Approves Enlist Duo Herbicide for Use in Additional States

April 2, 2015

The EPA has approved Enlist Duo herbicide for use in nine additional states, including four in the Cotton Belt.

Product News

New 2015 CROPLAN Cotton Varieties Feature Bollgard II XtendFlex Technology

March 19, 2015

WinField is adding Monsanto’s new Bollgard II XtendFlex cotton trait to two new CROPLAN cotton varieties for 2015.

Precision Technology

New Features for TeeJet Aeros 9040 Field Computer

March 18, 2015

TeeJet has added new features to its Aeros 9040 Field Computer for 2015.

Latest News
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.

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.