facebook_pixel

Sounding the Alarm

Since its discovery in 2004, glyphosate resistant Palmer amaranth has kept extension specialists and weed scientists with their hands full. When the resistant strain began popping up elsewhere – first in other counties, then other states, and finally in other regions of the Cotton Belt – those same industry experts were the first to sound the alarms. Four years later, they’ve got a better grasp on managing the problem.

But sounding the alarm is an every day challenge. That’s why Cotton Incorporated dedicated an entire session to the growing problem at their Cotton Management Seminar held in Tunica, MS, in November. The location of the seminar wasn’t just happenstance. Resistant pigweed is beginning to show up in alarming numbers in the Mid-South.

“We see glyphosate resistance as a national issue,” said Dr. Robert Nichols of Cotton Incorporated, while citing the problem’s westward movement from Georgia since 2004. “I would call it an emerging weed in the Mid-South, except our friends in Arkansas might disagree, seeing as how they already have this problem.” He went on to say that all Mississippi counties north of Highway 82 will be increasingly vulnerable to the problem in the near future.

Dr. Alan York of North Carolina State University further illustrated the movement of the weed epidemic. “2004 was the first sighting. We call that the epicenter, in Macon County, Georgia.”

To an expert like York, the weed’s success in such a wide variety of places is academic.

Designer Weed

“If you were going to design a weed, you’d use the blueprint for this one,” York says.

“(It has a) very efficient carbon fixation. It is water use efficient, and has very high temperature tolerance – optimum for photosynthesis at 180 degrees. So when it’s hot and dry, and the crop is struggling to hang on, this thing is happy. It grows very fast – an inch or two a day – and gets very big. Obviously it’s very competitive with the crops.”

In short, the resistant pigweed travels fast, appears quickly, and perhaps most problematically, grows to an unmanageable size almost overnight. At 2 inches tall, the weed can be easily managed. The problem of course, is that it cannot be easily spotted at 2 inches, and often by the time you see it, it has grown too large to kill with conventional chemistry.

“The difference between where it’s manageable and the size where it’s too big to control in a good growing environment might be 72 hours,” says Dr. Larry Steckel with the University of Tennessee. “We’re talking hours to be able to get out there. And as big as a lot of our growers have gotten, that’s going to be a challenge to get across that many acres, over the top, in that time period.”

A Greater Challenge

The general consensus among weed experts is that while Roundup Ready technology made life easier for growers, it also lulled them into a false sense of security. Because of the proliferation of the resistant gene, they say, cotton producers must unlearn some of the habits that came about with Roundup Ready practices.

“We all know that Roundup Ready technology was a good thing. It was idiot proof. But what it did was make our growers into weed sprayers. This resistance is going to make us go back and be weed managers,” says York.

Because of the plant’s ability to get out of hand so quickly, Steckel and other leading weed scientists are advising growers from the Southeast to the Mid-South to take pre-emptive steps against resistant pigweed.

“Even without the glyphosate resistance, we’re making a recommendation for something residual either pre-emergence, or maybe its Valor pre-plant and in that case we’d probably still want to follow it with something pre. We are trying to limit our PPO inhibitors to one application per year. And we are trying to not depend on ALS materials any more than we have to,” says Steckel.

Leave a Reply

Weed Control Stories
Weed Control

Arkansas Stands Firm on In-Season Dicamba Ban

November 9, 2017

The Arkansas State Plant Board voted November 8 to restrict the use of new dicamba products in the state for a second consecutive year.

Weed Control

Consider Establishing a Post Harvest Cover Crop

October 2, 2017

The adoption of cover crops in Tennessee has proven to be a major tool for successfully controlling Palmer amaranth.

Weed Control

Farmers Impressed with Enlist Duo Performance

August 30, 2017

Growers who have used Enlist Duo herbicide this summer have reported not only exceptional control of their toughest weeds, but are also impressed with how it stays on target.

Weed Control

Dicamba’s Defenders

August 22, 2017

Amid a chorus of complaints, many cotton producers express worry over losing an invaluable tool for weed control.

Soybeans

Arkansas Researchers Share Dicamba Volatility Studies

August 11, 2017

Work done by University of Arkansas weed scientists has found that every dicamba formulation tested this spring and summer demonstrated a level of volatility.

Weed Control

Post-Direct or Hooded Options for Layby Weed Control

July 6, 2017

Tennessee’s Larry Steckel offers recommendations for post-direct or hooded herbicide applications at layby.

Weed Control

Best Management Practices to Mitigate Dicamba Drift

June 27, 2017

To help offset potential dicamba drift issues, Tennessee Weed Specialist Larry Steckel offers best management practices to help reduce off-target movement.

Around The Gin
Product News

Bayer Looking for FiberMax One Ton Club Growers for 2017

November 16, 2017

Cotton growers who produce an average of 2,000 lb/A on 20 or more acres planted to FiberMax varieties in 2017 are eligible to be part of the 13th annual FiberMax One Ton Club.

Product News

Monsanto Delays NemaStrike for Additional Review

November 2, 2017

After finding cases of skin irritation, Monsanto is pulling its nematode seed treatment NemaStrike for further product review.

Product News

Intrepid Trio: Naturally Balanced Nutrition in Every Granule

November 1, 2017

Intrepid Trio contains three essential nutrients for cotton plants.

Product News

Save Time, Increase Efficiencies with Mixmate

November 1, 2017

Mixmate from Praxidyn is a precision chemical mixing system for small farms to large enterprises.

Product News

Crumpler Ironworks & Fabrication

November 1, 2017

Crumpler Ironworks & Fabrication is committed to providing the highest level of service, honesty and integrity, regardless of project size.

Product News

Delivering Proven Performance Across the Cotton Belt

November 1, 2017

Seed varieties, traits and crop protection products from Bayer deliver proven performance to growers across the Cotton Belt.

Product News

Growers Continue to Count on Americot and NexGen

November 1, 2017

Americot is dedicated to working with cotton growers throughout the Cotton Belt to provide elite performing NexGen varieties within the marketplace.

Product News

Deere Adds New Narrow Track Versions to 9RX Tractor Lineup

November 1, 2017

John Deere has added three new 9RX Narrow Track Tractors, expanding its lineup of high-horsepower machines.

Latest News
Weed Control

Arkansas Stands Firm on In-Season Dicamba Ban

November 9, 2017

The Arkansas State Plant Board voted November 8 to restrict the use of new dicamba products in the state for a second consecutive year.

Weed Control

No Pesticide Drift Complaints in Georgia in 2017

October 26, 2017

No official pesticide drift complaints due to in-season applications of dicamba or 2,4-D have been reported to the Georgia Department of Agriculture in 2017.

Weed Control

EPA Sets Revised In-Crop Dicamba Guidelines

October 13, 2017

The EPA has reached an agreement with Monsanto, BASF and DuPont on measures to further minimize the potential for drift damage from over-the-top use of dicamba formulations in genetically-modified cotton and soybeans.

Weed Control

Consider Establishing a Post Harvest Cover Crop

October 2, 2017

The adoption of cover crops in Tennessee has proven to be a major tool for successfully controlling Palmer amaranth.

Weed Control

Farmers Impressed with Enlist Duo Performance

August 30, 2017

Growers who have used Enlist Duo herbicide this summer have reported not only exceptional control of their toughest weeds, but are also impressed with how it stays on target.

Weed Control

Dicamba’s Defenders

August 22, 2017

Amid a chorus of complaints, many cotton producers express worry over losing an invaluable tool for weed control.

Soybeans

Arkansas Researchers Share Dicamba Volatility Studies

August 11, 2017

Work done by University of Arkansas weed scientists has found that every dicamba formulation tested this spring and summer demonstrated a level of volatility.

Weed Control

Post-Direct or Hooded Options for Layby Weed Control

July 6, 2017

Tennessee’s Larry Steckel offers recommendations for post-direct or hooded herbicide applications at layby.

Weed Control

Best Management Practices to Mitigate Dicamba Drift

June 27, 2017

To help offset potential dicamba drift issues, Tennessee Weed Specialist Larry Steckel offers best management practices to help reduce off-target movement.

Weed Control

Avoid Inversions When Spraying Weeds

June 19, 2017

Dr. Larry Steckel offers tips to help avoid potential problems when spraying dicamba in inversion conditions, even when proper guidelines are being followed.

Soybeans

Tips to Prevent Dicamba Drift

June 15, 2017

In a video presentation, Tennessee Weed Specialist Larry Steckel discusses three actions to help reduce dicamba drift and volatilization.

Soybeans

Dicamba Damage Reports Increasing in Arkansas

June 12, 2017

Forty complaints from off-target movement of dicamba have already been reported to the Arkansas State Plant Board, as of June 12.

Weed Control

Glyphosate-Resistant Johnsongrass Focus of New Webcast

May 22, 2017

A new webcast on effective management of glyphosate-resistant johnsongrass has been added to the Focus on Cotton online series from the Plant Management Network and Cotton Incorporated.

Weed Control

Weed Control Options in Light of Herbicide Shortages

May 9, 2017

Tennessee Extension Weed Specialist Larry Steckel outlines several options for early season cotton weed control in light of shortages of Caporol, Cotoran and Diuron.

Soybeans

Cooperation, Preparation Are Keys to Ag Sustainability

May 5, 2017

Georgia’s Stanley Culpepper outlines the training efforts for auxin herbicides in the state and praises the people who make it all work.