Finding The Right Residual

With planting just a few weeks away, many growers and dealers will begin reviewing last year’s herbicide programs to determine which products worked best on their farms.

This year, however, more growers and dealers — with the 2009 replants and late-winter harvests still fresh in their minds — will be looking at residual herbicides to help manage some of the early-season headaches they dealt with last year.

“Last year was one for the record books,” says Tommy Thompson, manager at Crop Production Services in Fancy Farm, KY. “We had growers who either couldn’t get into the fields or who were forced to replant their crops multiple times. Those who weren’t using a residual herbicide as part of their burndown program often had a tougher time keeping their fields clean early and getting an overall good start on the season.”

Though residual preemergence herbicides are becoming an increasingly popular component of many successful spring practices, it is important for growers and dealers to know which residual herbicide will work best for their needs.

Researchers suggest that residual herbicides should be evaluated on several factors, such as weed control, length of residual, and rotational flexibility. Preemergence residual herbicides such as Envoke, Valor, or Authority can vary in performance in the different factors.

Weed Control

As with any herbicide program, it is important to determine what types of weeds the product can be expected to effectively control. Tough weeds can differ by geographical area, type of soil or even overall history of chemical use in a field.

“Growers need to be sure that the residual product they are choosing to use will thoroughly control the specific weed problems in their fields,” says Kevin Bradley, University of Missouri weed scientist. Bradley suggests that understanding the weed profile of the specific geographic area is the first step in effective weed management.

Weed scientists are also reinforcing the role of preemergence residual herbicides in the fight against glyphosate-resistant or glyphosate-tolerant tough weeds.

“It is so much easier to control or reduce the population of glyphosate-resistant waterhemp with a preemerge compared to using a postemerge. It’s one of our top recommendations and top lines of defense against glyphosate-resistant waterhemp,” Bradley says. “Our research trials frequently show that you can control glyphosate-resistant waterhemp most effectively with a preemerge herbicide. No question, the research shows preemerges work better on tough weeds.”

In Thompson’s area, glyphosate-resistant marestail is extremely prevalent, and he believes other resistance issues may be just around the corner. He often recommends a 2-ounce rate of Valor in burndown programs to his customers who struggle with glyphosate-resistant marestail.

“The best way to kill tough weeds such as marestail is to hit them when they are small or not even out of the ground,” Thompson says. “This is why I recommend using a preemerge residual herbicide.”

Experts agree — one of the most important factors in choosing a residual herbicide is the length of control the herbicide provides. Many products today offer a range of a few days to several months of residual control, making it important for growers and dealers to know what to expect from various residual herbicides.

Length Of Residual

Dealers may ask: How long is enough control? Many university researchers suggest that a residual should give control for at least four weeks.

Bradley says in the case of residual herbicides, the longer the control the better.

“A lot of research has shown that if it is a particularly unpredictable year like 2009 and you use a product that only gets two weeks or less of control, you may have to come back with not only one but two post applications — which is usually too many trips across the field,” he says. Thompson has similar recommendations for his customers.

“A residual should have control for three to four weeks to be effective and a good investment,” he says. “This timeframe can usually hold you over until you can get in the field with a post application if needed.”

The unpredictable nature of farming makes the ability to use one product on a variety of different crops extremely important. For example, the erratic spring weather many experienced in 2009 pushed some growers to plant a different crop than planned. Fluctuating market prices can also move growers to shift to a more profitable crop. The ever-changing future that growers experience makes choosing a residual with rotational flexibility a wise decision.

“Using Valor is like a shotgun effect; you do one application and it can take care of several crops, should plans have to change,” Thompson says. “My customers appreciate that flexibility.”

Leave a Reply

Herbicides Stories

Young soybean field
HerbicidesLiquid Formulation Valor EZ Herbicide Available For 2017
December 1, 2016
Valent U.S.A. Corp. has released Valor EZ; a liquid formulation of the company’s leading herbicide, Valor. Named Valor EZ Herbicide Read More
HerbicidesNew Technology Offers ALS-Resistant Weed Control In Wheat
November 16, 2016
From searching for profitability in depressed wheat prices, to deciding among countless input options, wheat growers have a lot on Read More
CPP, glyphosate, dicamba, atrazine,
Crop InputsDeveloping Story: FDA Discontinues Glyphosate Residue Food Testing Program
November 15, 2016
Via The Huffington Post:  Government testing for residues of an herbicide that has been linked to cancer has been put Read More
Palmer amaranth
HerbicidesNDSU: Check Pollinator, Habitat Plots For Palmer Amaranth
November 14, 2016
North Dakota State University officials are asking anyone who has planted wildlife plots, to enhance honeybee and other pollinators, to Read More
Trending Articles
Precision AgTrimble Debuts End-to-End FMIS Platform
November 28, 2016
October’s inaugural PrecisionAg Vision Conference left this author with many thoughts and things to ponder in the coming months. Probably Read More
CHS Primeland
CropLife 100The 2016 CropLife 100 Report: Reviewing The Many Bulls And Bears Impacting This Year’s Marketplace
November 28, 2016
For virtually all of 2016, the nation was wholly focused on the big Presidential election. Some folks aligned themselves with Read More
Monsanto sign
Crop InputsMissouri Governor Meets With Bayer CEO To Discuss Monsanto Merger
November 21, 2016
Missouri Gov. Jay Nixon visited Bayer AG global headquarters in Leverkusen, Germany, on November 18 to discuss the proposed Bayer-Monsanto Read More
STS16 2017
SprayersHagie Manufacturing Releases 2017 STS16 Sprayer To Market
November 16, 2016
Hagie Manufacturing LLC’s largest full season applicator is now available with enhancements for the 2017 model year. Hagie is officially Read More
Wilco
CropLife 100Valley Agronomics, Wilco-Winfield To Form New Agronomy Joint Venture
November 11, 2016
Valley Agronomics LLC, headquartered in Rupert, ID, is a joint venture between Valley Wide Cooperative and Winfield Solutions, LLC. Wilco-Winfield, Read More
FertilizerThe Fertilizer Institute Issues Statement On The U.S. Elections
November 10, 2016
The Fertilizer Institute (TFI) President Chris Jahn has issued the following statement on the results of the 2016 elections: “TFI Read More
Latest News
Tim McCardle, ARA Chairman
CropLife 100BRANDT COO Named ARA Chairman
December 5, 2016
BRANDT EVP and Chief Operating Officer Tim McArdle has been named chairman of the Agricultural Retailers Association (ARA) during a Read More
Crop InputsWilbur-Ellis Receives ResponsibleAg Certification At Mo…
December 5, 2016
Wilbur-Ellis Co., a recognized leader in precision agriculture technology and the distribution of crop protection products, announces the ResponsibleAg certification Read More
Young Corn Closeup
Eric SfiligojThe Read On 2017 For Agricultural Fortunes Is Anybody’s…
December 5, 2016
As I (and others) have written in recent months, the nation has just experienced one of the most offbeat election Read More
Acceleron B-300 seed coating
Crop InputsThe BioAg Alliance Launches New Yield-Boosting Microbia…
December 5, 2016
As part of their commitment to develop and commercialize innovative microbial solutions for farmers through The BioAg Alliance, Monsanto Co. Read More
ManagementCorn and soy planting update; Takeaways from Climate Co…
December 2, 2016
AgriBusiness Global Editor Dave Frabotta Joins Paul Schrimpf for a discussion of global corn and soybean planting trends, and a Read More
Radish cover crop taproot
Crop InputsSoil Health Institute, Datu Research Receive Grant To E…
December 1, 2016
The Soil Health Institute (SHI) and Datu Research have announced a $626,000 grant from the Walton Family Foundation to quantify the Read More
Mike Stern
Precision AgClimate Corp. CEO Talks Retailer Support For Digital Ag
December 1, 2016
CropLife Magazine’s sister publication, AgriBusiness Global, recently sat down with Mike Stern, CEO of The Climate Corp., following the Monsanto subsidiary’s Read More
ManagementAg Industry Comes Together To Address Climate Change
December 1, 2016
Addressing climate change — and more specifically, decreasing greenhouse gas emissions from agriculture — can only be achieved through collective Read More
Young soybean field
HerbicidesLiquid Formulation Valor EZ Herbicide Available For 201…
December 1, 2016
Valent U.S.A. Corp. has released Valor EZ; a liquid formulation of the company’s leading herbicide, Valor. Named Valor EZ Herbicide Read More
Key Cooperative Marcus Construction Steel Building
ManagementThe Value Of Cooperatives In Modern Agriculture
December 1, 2016
Editor’s Note: Jaxon Mullinnix of  Lone Tree, IA, was recently named the Iowa state winner of the 2017 GROWMARK essay Read More
AGCO Operator of the Year Tony Kornder
SprayersAGCO Names Tony Kornder Operator Of The Year
December 1, 2016
AGCO Corp. names Tony Kornder with Genesis Growing Solutions in Le Sueur, MN, the 11th annual Operator of the Year. Read More
Chris Henney OABA
ManagementOABA Industry Conference To Provide Outlook For Future …
November 29, 2016
The upcoming Ohio AgriBusiness Association Industry Conference is packed with widely-respected speakers and industry professionals, sharing their expertise on a Read More
Corn
InsecticidesMajor Review Finds Neonic Poses Low Risk To Aquatic Inv…
November 28, 2016
A major new ecotoxicological review and risk assessment has been published in the peer-reviewed literature and concluded that registered crop Read More
EquipmentGSI Details New Grain Drying Efficiency System for Coop…
November 28, 2016
Grain elevators and ag co-ops are always looking for ways to increase their energy efficiency to help improve profitability. For Read More
Precision AgTrimble Debuts End-to-End FMIS Platform
November 28, 2016
October’s inaugural PrecisionAg Vision Conference left this author with many thoughts and things to ponder in the coming months. Probably Read More
AGCO AgControl system
Precision AgPrecision Ag Technology: Rate Control For The Times
November 28, 2016
It’s not surprising that the need for more economical, effective application is driving the demand for the latest rate controllers Read More
ARA
Eric SfiligojTaking The Industry’s Pulse At ARA
November 28, 2016
When most of you read this particular column, many of the industry’s key folks will probably be spending at least Read More
CHS Primeland
CropLife 100The 2016 CropLife 100 Report: Reviewing The Many Bulls …
November 28, 2016
For virtually all of 2016, the nation was wholly focused on the big Presidential election. Some folks aligned themselves with Read More