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

HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
HerbicidesArysta Touts Burndown Herbicide For Brome Management In Wheat
June 4, 2014
Arysta LifeScience North America recommends PRE-PARE Burndown Herbicide for effective brome management in winter wheat. Read More
HerbicidesFall Herbicide Applications More Effectively Manage Resistant Italian Ryegrass
May 14, 2014
Field studies show that a fall application of certain herbicides before weed emergence, leads to more successful crop planting and weed control in spring. Read More
Waterhemp in soybean stubble
HerbicidesThe Weed Resistance Problem: A Matter Of Billions
April 1, 2014
Not only is the amount of money being spent to control these yield robbers high, but the toll it has taken on the human population is growing lager by the day. Read More

Trending Articles

Equipment2014 Product Of The Year Voting
September 19, 2014
Many new products were introduced to the ag retail marketplace this year. From this group, CropLife IRON and its consulting partners have selected five finalists for the Product of the Year award. Please cast your vote today to help us determine the winner. Read More
FertilizerFall Fertility 2014: Forecasting Fertilizer Use
September 7, 2014
Great crops this year have tapped the soil, and fall work is definitely called for, but how challenging will that get? Read More
CropLife 100CHS To Build $3 Billion Fertilizer Plant In North Dakota
September 5, 2014
The fertilizer plant in Spiritwood will be the single largest investment in CHS history, as well as the single largest private investment project ever undertaken in North Dakota. Read More
EquipmentNew Holland Acquires Miller-St. Nazianz
September 3, 2014
The assets of Miller acquired as part of the transaction will become part of New Holland Agriculture, a CNH Industrial brand, building on a successful four-year partnership between the two companies. Read More
CropLife 100Pinnacle Acquires East Kansas Chemical
September 2, 2014
Ranked 82nd on the CropLife 100, East Kansas Chemical will operate as part of Pinnacle's Performance Agriculture brand. Read More
MAGIE 2014 ShowStopper
EquipmentJohn Deere Again Wins MAGIE ShowStopper Award
August 25, 2014
For the second consecutive year, John Deere was honored at the Midwest AG Industries Exposition (MAGIE) for its new R4045 sprayer. Read More

Latest News

Syngenta
Crop InputsSyngenta Launches Plant Breeding Academy
October 1, 2014
Syngenta announces the release of its Breeding Academy, a global initiative designed to enable the continued development of scientists at Syngenta and beyond. Read More
FertilizerFertilizer Outlook And Technology Conference Set For No…
September 30, 2014
Conference participants can expect to gain perspective on the outlook for agriculture and major fertilizer materials and inputs from industry experts. Read More
MicronutrientsVerdesian Acquires Micronutrient Supplier
September 30, 2014
Verdesian Life Sciences has acquired QC Corp., a producer and supplier of granular and dry micronutrients and ferrous sulfate products. Read More
Eric SfiligojHearing From Young Ag Voices
September 30, 2014
Potential future leaders in ag retail had the chance to shine at the recent Mid America CropLife Association meeting. Read More
WebinarsUpcoming Webinars
September 30, 2014
Register for one of our upcoming Webinars or access our archive of past Webinars to view recordings of presentations that may be of interest to you. Read More
Crop InputsSyngenta Appoints New Chief Operating Officer
September 29, 2014
Jon Parr will succeed retiring COO John Atkin at the end of the year. Read More
CropLife 100South Dakota Wheat Growers To Add Grain-Agronomy Facili…
September 26, 2014
Planned to be constructed in Kennebec, the facility will be located along the soon-to-be rehabilitated line of heavy-rail service from Chamberlain to Presho. Read More
CropLife 100GROWMARK Announces Vice President Appointments
September 25, 2014
Two individuals have been appointed Vice President positions on the GROWMARK executive team. Read More
FertilizerFertilizer Industry Organizations Join Global Alliance …
September 25, 2014
The Fertilizer Institute, the International Plant Nutrition Institute and the International Fertilizer Industry Association are encouraging the industry to promote the proper use of fertilizer products to minimize their environmental impact. Read More
Precision AgARA Organized Precision Forum Hits Capitol Hill
September 24, 2014
The Coalition for the Advancement of Precision Agriculture (CAPA) hosted its inaugural Precision Ag Forum, Sept. 18, in Washington, D.C. Read More
FertilizerFactors To Consider When Placing Fertilizer With Seed
September 24, 2014
The type of crop, fertilizer source, row spacing and soil environment all affect how much fertilizer can be safely applied with seed. Read More
FertilizerSidedressing Manure Into Corn Has Promising Results
September 24, 2014
Applying manure to growing crops can boost yields, reduce nutrient losses and give livestock producers another window of time to apply manure to farm fields. Read More
FertilizerWhen To Sample Manure For Analysis
September 24, 2014
Because the goal is to collect a sample that represents the manure actually being applied, the best time to sample is during loading or field application. Here's why. Read More
Syngenta
Seed/BiotechSyngenta Faces Second Lawsuit Over Agrisure Viptera Cor…
September 23, 2014
A second company has sued Syngenta AG over sales of genetically modified corn seed not approved by China. Read More
StewardshipCover Crops Field Guide For Farmers Expanded
September 23, 2014
Farmers interested in planting cover crops to improve soil health now have an updated and expanded resource in the second edition of the Midwest Cover Crops Field Guide. Read More
HerbicidesArysta LifeScience Launches Contest For Wheat Growers
September 23, 2014
The Flush after Flush Photo Finish contest encourages farmers across the U.S. to participate through Instagram or Twitter using the hashtag #FlushAfterFlush. Read More
FertilizerCF Industries Confirms Merger Of Equals Discussions Wit…
September 23, 2014
CF Industries Holdings, Inc. has confirmed that it is in preliminary discussions with Yara International regarding a potential merger of equals transaction. Read More
StewardshipProgram To Examine Ag-Related Practices, Policies To Pr…
September 22, 2014
A panel discussion on October 14 will include a significant discussion on key issues and solutions related to all aspects of harmful algal blooms. Read More