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

glyphosate
Crop InputsWHO: Glyphosate ‘Unlikely’ To Cause Cancer
May 16, 2016
Via Reuters.com reporter Kate Kelland: The weed-killing pesticide glyphosate, made by Monsanto and widely used in agriculture and by gardeners, Read More
dicamba, Roundup Ready 2 Xtend
Crop InputsASA: No Dicamba On Roundup Ready 2 Xtend In 2016
May 16, 2016
While Roundup Ready 2 Xtend (RR2X) are tolerant to dicamba and glyphosate herbicides, no dicamba herbicides will be approved for Read More
CPP, glyphosate, dicamba, atrazine,
Crop InputsReport: Congress Pressing EPA On Glyphosate Review Handling
May 16, 2016
Via Reuters.com reporter P.J. Huffstutter: U.S. lawmakers have asked EPA to explain why it published – and then withdrew – Read More
Palmer amaranth in soybean stubble
HerbicidesWSSA: Billions In Potential Economic Losses From Uncontrolled Weeds
May 4, 2016
What losses would corn and soybean growers experience if they were forced to eliminate herbicides and other control techniques from Read More
Trending Articles
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stewardship Certification Program
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To Explore IT Solutions
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
Monsanto Luling Plant
Eric SfiligojWhat’s Next For Monsanto?
May 31, 2016
For the folks at Monsanto’s headquarters in St. Louis, MO, it has been an eventful few weeks. Back on May Read More
Soybean Plant closeup
Industry NewsMonsanto Rejects Bayer Bid; Open To More Talks
May 25, 2016
Monsanto Co, the world’s largest seed company, turned down Bayer AG’s $62 billion acquisition bid as “incomplete and financially inadequate” Read More
Eric SfiligojPity The Monsanto Haters
May 23, 2016
An old saying goes thus: “Be careful what you wish for. You just might get it.” Given current events, there Read More
Monsanto Luling Plant
Crop InputsReport: Bayer Eyeing Monsanto For Possible Mega-Merger
May 16, 2016
Bayer AG is exploring a potential bid for U.S. competitor Monsanto Co. in a deal that would create the world’s Read More
Latest News
ManagementUpdates on Glyphosate Use in the EU and Bayer/Monsanto
June 29, 2016
Editors Paul Schrimpf and Eric Sfiligoj discuss the latest important developments on these crop protection fronts. Read More
Industry NewsCompass Minerals Names Protassium+ Sales Director
June 28, 2016
Compass Minerals, the producer of Protassium+ sulfate of potash, has named Scott Johnson director of sales for Protassium+ North America. Read More
Eric SfiligojThe British Leave Vote Impact On EU Agriculture
June 27, 2016
Like virtually everyone else in the world this past week, I’ve watched the global reaction to Britain’s vote to exit Read More
Valent David Nothmann
Crop InputsValent Names David Nothmann Vice President Of Marketing
June 27, 2016
Valent U.S.A. Corp. has announced the appointment of David Nothmann as vice president of marketing. Nothmann will be responsible for Read More
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stew…
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
CropLife 100BRANDT Contributes To Mayo Clinic
June 27, 2016
BRANDT, a leading agriculture retailer and manufacturer of specialty agriculture products, has pledged a sizable donation to the Mayo Clinic Read More
ManagementReport: U.S. Farmland Values On Average Continue Gradua…
June 27, 2016
Land price movement has been in the forefront for farmers, landowners, lenders and land brokers for a decade now during Read More
AdjuvantsPrecision Laboratories Introduces Intact Xtra For Use W…
June 27, 2016
Precision Laboratories announces the launch of Intact Xtra, an adjuvant designed for applicators who want to maximize spray applications and Read More
Key Cooperative’s new liquid fertilizer, crop chemical, and seed facility in Grinnell, IA stores 1.5 million gallons of liquid fertilizer and 120,000 gallons of crop chemicals.
Retail FacilitiesKey Cooperative Facility Features The Latest In Murray …
June 27, 2016
When Key Cooperative wanted to improve the overall efficiency at its new state-of-the-art facility in Grinnell, IA, it turned to Read More
Allen Summers Asmark Institute PSM Training
EmployeesAsmark Institute Sponsors 25 ResponsibleAg Auditor Trai…
June 21, 2016
The Asmark Institute has announced plans to provide 25 scholarships through their affiliated State fertilizer and agrichemical associations to help encourage Read More
Kennebec Elevator
CropLife 100Wheat Growers Celebrates Kennebec Elevator Grand Openin…
June 21, 2016
Over 250 patrons and guests were on hand to celebrate Wheat Growers’ Kennebec Elevator grand opening. South Dakota Secretary of Read More
Land O Lakes
Industry NewsLand O’Lakes To Acquire Ceres
June 20, 2016
Land O’ Lakes, Inc. and Ceres, Inc. have announced that they have signed a definitive merger agreement under which Land O’Lakes Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To …
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
LegislationVilsack Christens WinField Crop Adventure, Talks Monsan…
June 17, 2016
The WinField Crop Adventure grand opening ceremonies at Fair Oaks Farms (near Winemac, IN) welcomed USDA Secretary of Agriculture Tom Read More
Crop InputsFields of the Future: WinField Doubles Down with Agri-E…
June 16, 2016
Land O’Lakes, Inc., joined by Agriculture Secretary Tom Vilsack, today will host Fields of the Future, a live broadcast about Read More
Bayer sign
Crop InputsMonsanto Turns Back Bayer Again
June 14, 2016
Bayer AG’s bid to buy Monsanto Co. for more than $60 billion has hit an impasse that could pose a Read More
Young Corn Field
Crop NutritionNext Generation Of Nitrogen Efficiency Technology Conve…
June 13, 2016
Commodity price projections indicate farmers will continue to face tight margins again this year. Delivering higher yields and more bushels Read More