Herbicides
Gowan Canada has added volunteer canola to the Permit WG Herbicide label in time for spring 2017.

Permit is registered for pre-emergent and post-emergent use in dry beans, and post-emergent use only in corn. Data generated by independent contract researchers has consistently shown high levels of extended residual control of volunteer canola from both pre and post-emergent applications.

For more information on Permit for volunteer canola, growers are urged to contact their local retailer.
New herbicide product registrations and label updates continue to bring more choice to farmers, with multiple modes of action to manage weed infestations and herbicide resistance. The following product information has been provided to Top Crop Manager by the manufacturers.
Mississauga, ON – Corn growers in Eastern Canada now have a new tool for fast and hassle-free weed control. DuPont Crop Protection announced that approval has been granted for registration of DuPont Destra IS herbicide.

Destra IS is a post-emergence corn herbicide with one-pass broad-spectrum knockdown and residual control, and adds two additional modes-of-action to a glyphosate tolerant system – there’s also residual control and multiple modes of action. The herbicide will allow growers to control hard-to-kill broadleaf and grassy weeds and to keep corn weed-free during the critical weed-free period.

Destra IS has a wide window of application, allowing growers to apply up to the eight-leaf stage, with excellent crop safety and a broader geography, including short season areas. It offers a smaller, easy-to-handle package and compact dry formulation, and is the only dry mesotrione formulation on the market. It offers a faster pour and bottle cleanout.

Fore more information visit Dupont.ca
SASKATOON – Western Canadian corn growers now have a new tool to remove early season weed pressure to help maximize yield and profits in corn. DuPont Crop Protection has announced that approval has been granted for registration of DuPont Sortan IS herbicide.

DuPont Sortan IS herbicide will allow growers to control tough, yield robbing weeds, such as volunteer Roundup Ready canola, wild buckwheat, redroot pigweed (including triazine-resistant biotypes), lamb's-quarters, green foxtail, barnyard grass, and quackgrass, to keep corn weed-free to maximize yield and profits.

An additional mode of action to glyphosate, Sortan IS offers application flexibility – it can be applied pre-emergent or post-emergent, and provides extended control throughout the critical weed free period. For optimum weed control, it is recommended that Sortan IS be tank-mixed with glyphosate herbicide at 900 g ai/ha for control of additional weeds.

Sortan IS will be available at local retailers in Western Canada for the 2017 season.

For more information, visit dupont.ca
Lentil and canola growers in Western Canada have new options for burndown weed control with new herbicide updates from Nufarm Agriculture Inc. Valtera is now approved for a fall application prior to seeding lentils (large green and small red types).

Valtera (Group 14) is a distinct mode of action that can be used as part of a fall burndown program for residual weed control where lentils will be planted the following crop season. Valtera controls a range of broadleaf weeds including pigweed, lamb’s-quarters, seedling dandelion, kochia and chickweed, and suppression of green foxtail and volunteer canola. Valtera re-activates with moisture to deliver residual control that lasts for four to six weeks in the spring. Valtera is also registered for spring or fall pre-seed burndown and residual control in chickpeas, field peas, soybeans and spring wheat. Visit nufarm.ca for more info.
Axter Agroscience has improved the performance of CropBooster with the addition of specific organic acids and micronutrients to create CropBooster 2.0. These modifications generate a significant yield increase.

CropBooster 2.0 in the herbicide tank mix produced an average yield increase of 3.3 bushels of wheat per acre in multiple field trials. In these same experiments, CropBooster 2.0 performed better than the original CropBooster with a higher yield increase.

By allowing crop plants to restart growth or to continue growing more quickly, CropBooster 2.0 is also proven to increase yields without reducing weed control.

Click here for more information.

FMC of Canada has announced a new expanded label for Authority 480 herbicide. The new label features more registered weeds and additional crops, according to a press release.

The weeds include eastern black nightshade, a particularly troublesome weed for identity preserved (IP) soybeans, and common waterhemp – the newest glyphosate-resistant weed in Eastern Canada. There are 13 weeds on the new expanded label, such as red root pigweed, lamb’s-quarters, wild buckwheat, eastern black nightshade, common waterhemp, yellow woodsorrel, common groundsel, cleavers (suppression), Powell pigweed and common purslane.

Authority offers a new group 14 weed control option for group 2 and glyphosate resistant weeds. 

Several new specialty horticulture crops have also been added to the Authority herbicide label, including chickpeas, field pea, flax and sunflowers. 

August 24, 2016 - Command, a herbicide from FMC, is now registered for control of cleavers in canola.
 
Command is a Group 13 pre-emergent herbicide that will provide canola growers with residual control of cleavers and will be an integral part of an overall cleaver management program in canola.  It is a liquid formulation that can be tank-mixed with glyphosate for a one pass pre-seed application. 

Command can be used with any canola herbicide system.
 
You may think weeds resistant to herbicides are a new phenomenon linked to the overuse of glyphosate in genetically engineered crops, but according to the Weed Science Society of America (WSSA) nothing could be further from the truth. This year marks only the 20th anniversary of glyphosate-resistant crops, while next year will mark the 60th anniversary of the first reports of herbicide-resistant weeds.

The first known report of herbicide-resistance came in 1957 when a spreading dayflower (Commelina diffusa)growing in a Hawaiian sugarcane field was found to be resistant to a synthetic auxin herbicide. One biotype of spreading dayflower was able to withstand five times the normal treatment dosage. That same year wild carrot (Daucus carota) growing on roadsides in Ontario, Canada, was found to be resistant to some of the same synthetic auxin herbicides.

Since then, 250 species of weeds have evolved resistance to 160 different herbicides that span 23 of the 26 known herbicide mechanisms of action. They are found in 86 crops in 66 countries, making herbicide resistance a truly global problem.

“Given all the media attention paid to glyphosate, you would think it would have the greatest number of resistant weed species,” says David Shaw, PhD, a Mississippi State University weed scientist. “Though there are currently 35 weed species resistant to the amino acid synthesis inhibitor glyphosate, there are four times as many weed species resistant to ALS inhibitors and three times as many resistant to PS II inhibitors.”

Scientists say what is unique about glyphosate resistance is the severity of selection pressure for resistance development. More than 90 per cent of soybean, corn, cotton and sugar beet acres in the U.S. are glyphosate tolerant and receive glyphosate treatments – often multiple times per year.

“The sheer size of the crop acreage impacted by glyphosate-resistant weeds has made glyphosate the public face for the pervasive problem of resistance,” says Shaw. “But resistance issues are far broader than a single herbicide and were around long before glyphosate-resistant, genetically engineered crops were even introduced.”

Research shows that resistant weeds can evolve whenever a single approach to weed management is used repeatedly to the exclusion of other chemical and cultural controls – making a diverse, integrated approach to weed management the first line of defense. Many growers have had great success fighting resistance by adopting a broader range of controls.

One example is found in the experiences of U.S. cotton growers in the southern U.S. After years of relying on glyphosate for weed control, resistant Palmer amaranth (Amaranthus palmeri) began to overrun crops and caused yields to plummet. Today integrated weed management programs that use a diverse range of controls have become commonplace in cotton, despite the higher cost. Growers are using cover crops, hand-weeding, tillage, weed seed removal and herbicides with different mechanisms of action in order to keep Palmer amaranth at bay.

There have been tradeoffs. Additional herbicides, labor and fuel have tripled the cost of weed control in cotton. In addition, increased tillage has raised concerns about soil erosion from water and wind.  But for now, the crop has been preserved.

“Although diversification is critical to crop sustainability, it can be difficult to make a decision to spend more on integrated weed control strategies,” says Stanley Culpepper, PhD, a weed scientist at the University of Georgia. “As a result, many of the most successful diversification efforts can be found in crops like cotton where change became an imperative.”

Culpepper says that in addition to costs, another barrier to adoption of integrated weed management is the belief by some that new types of herbicides will be invented to take the place of those no longer effective on resistant weeds. But the HPPD-inhibitors discovered in the late 1980s for use in corn crops are the last new mechanism of action to make its way out of the lab and into the market.

“It would be naïve to think we are going to spray our way out of resistance problems,” Culpepper says. “Although herbicides are a critical component for large-scale weed management, it is paramount that we surround these herbicides with diverse weed control methods in order to preserve their usefulness – not sit back and wait for something better to come along.”

Weeds defend themselves from control measures in many ways, and can adapt to our cropping systems. A winter annual cleavers is avoiding herbicide control because it germinated in fall and will be too large and difficult to kill before an herbicide is applied in the spring. Buckwheat is naturally tolerant to glyphosate, although it is not resistant. Stork’s bill can be a winter annual but it is also morphologically plastic and keeps germinating all season long. Herbicide resistance is another way a plant defends itself.

For me, the world’s greatest herbicide was – and I say that in the past tense, was – glyphosate. It’s unfortunate but in my geography it is a herbicide of the past on many driver weeds. For me Palmer amaranth is a driver weed. For you that may be kochia. That may be wild oat. That could be green foxtail.

June 17, 2016 - It's hard to find a herbicide like glyphosate. It's cheap, highly effective, and is generally regarded as one of the safest and most environmentally benign herbicides ever discovered. But a report last year that glyphosate could cause cancer has thrown its future into jeopardy. Now the European Union faces a 30 June deadline to reapprove its use, or glyphosate will not be allowed for sale. Here's a quick explanation of the issues.

Erik Stokstad with Science magazine looks at the issue.

READ MORE.

 

May 5, 2016, Ontario – Over the last eight years, growers in Eastern Canada have faced an alarming and unexpected increase in resistance. Glyphosate-resistant giant ragweed, common ragweed, Canada fleabane and waterhemp are among the weeds surfacing across southern Ontario and Quebec. This upsurge in resistance is radically affecting quality and yield in corn and soybean crops and no field is immune.

“The first glyphosate-resistant weed was identified in 2008 in Ontario. Since then, glyphosate-resistant giant ragweed is now found in the six southwestern counties in Ontario,” says Peter Sikkema, professor of field crop weed management at the University of Guelph, Ridgetown Campus. “It has been identified in Essex, Kent, Lambton, Elgin and Middlesex, as well as Huron counties.”

Glyphosate-resistant Canada fleabane seed is wind dispersed, contributing to its rapid spread across southern Ontario. It is now found in 28 counties from Essex county in the southwest to Glengarry county on the Quebec border.

“Based on our research I really think that it is important that farmers incorporate multiple modes of action, on every acre every year, as part of an overall weed management strategy,” says Sikkema.

To aid in the fight against glyphosate-resistant weeds, BASF has introduced a new herbicide for corn called Armezon PRO. According to the company, it is a pre-mix of Armezon and Frontier Max that provides fast-acting, broad-spectrum residual control of both grass and broadleaf weeds for growers looking for additional modes of action and an excellent resistance management strategy.

“Armezon PRO offers a wide window of application from the one to eight leaf stage,” said Rob Miller, technical development manager, Eastern Canada, BASF, in a press release. “It must be applied with atrazine, but for growers looking for an additional activity on tough to control broadleaf weeds, substituting Marksman for atrazine will provide up to five modes of action in glyphosate-tolerant corn.”

Armezon PRO is also fast acting on conventional corn, tank-mixed with Merge up to the three leaf stage.

“If you go into the field earlier at the one to two leaf stage, there is enhanced residual control with the Marksman tank-mix,” continued Miller.

Marksman in combination with glyphosate can be used from the one to five leaf stage. The use of Marksman provides better activity on perennial weeds, as well as glyphosate-resistant species, such as Canada fleabane, giant and common ragweed and waterhemp.

“I think we can confidently say that there will be additional glyphosate-resistant weeds found in the province in the future and the current glyphosate-resistant weeds will be found over a wider geographic area,” said Sikkema. “I think it’s very important that farmers have a diverse crop rotation to reduce the selection intensity for glyphosate-resistant weeds.”

Apr. 29, 2016 - A number of public weed surveys show us that herbicide resistance is an ongoing concern for Western Canadian growers. Glyphosate (Group 9) resistance and Group 2 resistance is continuing to spread and causing concerns for growers. There are 19 resistant weed species in Saskatchewan alone, 23 in Alberta and 19 in Manitoba (source: Hugh Beckie, Agriculture and Agri-Food Canada).

In managing herbicide resistance, growers should be mindful of the different stages for controlling weeds within the span of the growing season. Pre-seed weed control can sometimes be overlooked and is a key consideration.

"We recommend growers tank-mix their glyphosate to improve their pre-seed herbicide application and help delay the onset of resistance," said Danielle Eastman, brand manager for western herbicides and Clearfield at BASF. "Heat LQ, a Group 14 chemistry, is a unique active for cereal growers that can be applied at higher rates for residual suppression of flushing weeds including volunteer canola and will help control other resistant weed species such as kochia and wild buckwheat. Heat LQ tank-mixed with glyphosate applied pre-seed in cereals is going to provide broadleaf weed control in as few as three to five days (depending on active growing conditions), cleaning up those fields for cereal crops to emerge."

Dennis Connor lives North of Beechy, Sask. and has learned the importance of adding another mode of action with his glyphosate to combat resistance build-up on his farm. "Narrow-leaved hawk's-beard and resistant kochia have become a problem on our farm and we feel it's important to have a second mode of action on these weeds. Heat LQ added to the glyphosate is a powerful tool. It smokes these weeds very quick and our farm is mostly under control now."

Quick pre-seed weed control can help knock out resistant weed competition. "The other advantage with Heat LQ is how fast it works in the field. The weeds are crisp in like three to four days and you know we've got them under control. We like the performance," added Connor, noting this gives his field a clean start to the season. That's an important part of managing and mitigating weed resistance.

Eastman noted that crop protection companies like BASF continue to bring new chemistries to the market and recommend growers tank-mix their chemistries with multiple effective modes of action with herbicides active on the same target species to get the best results while managing herbicide resistance.

 

Apr. 13, 2016 - The member companies of the Western Grains Elevator Association and the Canadian Oilseed Processors Association have individually advised that they will not accept delivery of canola grown and harvested in 2016 that has been treated with quinclorac, a pesticide used to control cleavers. Growers are encouraged to speak with their local elevator or processor for additional details.

Quinclorac is not currently a recommended control option in canola because of ongoing concerns about residue limits in one of our largest export markets. Until exporters and processors are confident that they can ship quinclorac-treated canola to China without trade concerns, growers are advised to avoid this marketing risk by using other cleavers control methods.

A well-managed, systemic approach is the best strategy for bringing cleavers under control. For more information about controlling cleavers, contact your local Canola Council agronomist.

More information:

 

 

 

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