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

Giant Ragweed
HerbicidesStudy: Focusing On Weed Seedbank Can Help Manage Herbicide-Resistant Giant Ragweed
January 18, 2017
Researchers writing in the latest issue of the journal Weed Science provide important insights on the control of herbicide-resistant giant Read More
HerbicidesEPA Expands Enlist Duo Herbicide Registration To 34 States
January 13, 2017
The U.S. EPA has expanded the geography for application of Enlist Duo herbicide from 15 to 34 states. This means Read More
HerbicidesHow Does Herbicide Resistance Evolve?
January 6, 2017
Herbicide-resistant weeds have evolved in response to repeated use of herbicides with the same site of action (SOA), according to Read More
Kochia
Herbicides9 Recommendations For Reducing The Risks Of Herbicide Resistance
January 5, 2017
To address the increasing urgent problem of herbicide resistance, the Weed Science Society of America makes the following recommendations: Reduce the Read More
Trending Articles
AgriSync
Matt Hopkins17 Agriculture Apps That Will Help You Farm Smarter In 2017
December 9, 2016
Ag professionals are working smarter, not harder, than ever before. Smart farming technologies have enabled them to reduce costs, maximize Read More
R4023 Sprayer, John Deere
CropLife 100Ag Retail Equipment Report: The Green Party Continues
December 7, 2016
In the annual race for sales in the ag retail equipment marketplace, the color schemes for participants are a little 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
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
Latest News
Eric SfiligojNo Alternative Facts: Dicamba Cropping System Applicato…
January 23, 2017
During President Donald Trump’s inauguration, much fuss was made over the use of the term “alternative facts” vs. some of Read More
Young Corn Plants
ManagementTimac Agro USA Acquires Michigan Ag Retailer
January 20, 2017
Timac Agro USA, an agriculture supply company specializing in high-efficiency plant and animal nutrition products, has acquired St. Louis,MI-based A&E Ag, Read More
Soybean field
Crop InputsNufarm Teams Up With John Deere Financial
January 19, 2017
Nufarm and John Deere Financial have teamed up to help farmers grow a better tomorrow. This program helps make purchases Read More
Sonny Perdue
LegislationTrump Formally Picks Perdue As Agriculture Secretary
January 19, 2017
U.S. President-elect Donald Trump officially announced Sonny Perdue as his choice for secretary of agriculture on Thursday, selecting a former Read More
ManagementPresident Trump, Wisconsin Review, and a Dow-DuPont Upd…
January 18, 2017
Editors Paul Schrimpf and Eric Sfiligoj reflect on a new administration, a recent winter show, and crop protection company mergers. Read More
Industry NewsBayer, MS Technologies Get China Approval For Balance G…
January 18, 2017
MS Technologies and Bayer have received import approval from China for Balance GT soybeans. The new Balance GT Soybean Performance Read More
Werner Baumann, Bayer AG, and Hugh Grant, Monsanto
Industry NewsReport: Monsanto, Bayer CEOs Among Latest to Make Trump…
January 18, 2017
The chief executive officers of German chemical giant Bayer AG and U.S. seed behemoth Monsanto, Werner Baumann and Hugh Grant, Read More
Giant Ragweed
HerbicidesStudy: Focusing On Weed Seedbank Can Help Manage Herbic…
January 18, 2017
Researchers writing in the latest issue of the journal Weed Science provide important insights on the control of herbicide-resistant giant Read More
Management3 Financial Trends To Watch In Agriculture
January 17, 2017
I recently had the opportunity to attend a meeting of credit managers for Midwest ag supply and input companies, in part Read More
Andersons Retail Store
CropLife 100The Andersons To Close All Retail Stores; Shutdown Does…
January 16, 2017
In a stunning announcement to the Toledo area, The Andersons Inc. said on Sunday that it would close its two Read More
Trimble TMX-2050 In-Cab Display
Eric SfiligojPrecision To Lead Agriculture In 2017?
January 16, 2017
Another new year is upon us! And I’m certain I speak for many in the agricultural world when I say Read More
Corn
Eric SfiligojThe Mood From Madison? In A Holding Pattern
January 16, 2017
Last week, I had the chance to attend the annual Wisconsin AgriBusiness Classic show in Madison, WI. It’s been a Read More
Syngenta Sign
Crop InputsAccenture Helps Syngenta Transform Its Global Logistics
January 13, 2017
Syngenta, a leading agriculture company, has collaborated with Accenture to design and implement a new digital logistics operating model across Read More
Fall Creek Seth Harden The Nature Conservancy
StewardshipLocal Farmers’ Watershed Initiative: Continuous Improve…
January 13, 2017
The goal in the Big Pine Watershed Project is to more intentionally do what local farmers and responsible ag retailers Read More
HerbicidesEPA Expands Enlist Duo Herbicide Registration To 34 Sta…
January 13, 2017
The U.S. EPA has expanded the geography for application of Enlist Duo herbicide from 15 to 34 states. This means Read More
Olson Ag Enterprise
CropLife 100Wilbur-Ellis Acquires Nebraska Seed Retailer
January 13, 2017
Wilbur-Ellis’ Agribusiness, a recognized leader in precision agriculture technology and the distribution and marketing of plant protection, seed and nutritional Read More
ManagementDeere-Precision Planting Update and the Ag Secretary Wa…
January 12, 2017
Editors Paul Schrimpf and Eric Sfiligoj provide the latest on the court date for John Deere/Precision Planting and the quest Read More
Monsanto sign
Seed/BiotechMonsanto, NRGene Form Agreement For Big Data Genomic An…
January 12, 2017
Monsanto Co. and NRGene have announced that the companies have reached a non-exclusive, multi-year global licensing agreement on NRGene’s genome-analysis Read More