Pre-Seed Tank-Mix Recommendations for Western Canadian Growers

Start your crop off on the right foot by including a tank-mix partner in your pre‑seed burndown to help control weeds and fight herbicide resistance.

Glyphosate (Group 9), the active ingredient in Roundup WeatherMAX^® and Roundup Transorb^® HC herbicides, is the cornerstone of many weed management programs across the country. It is also the most widely used herbicide in Canada. In Western Canada, diverse crop rotations have helped keep glyphosate resistance at bay; however, Western Canadian growers have to deal with other herbicide-resistant weeds like Group 1- and 2-resistant wild oats and Group 2-resistant cleavers. Some populations of these weed species are also resistant to multiple herbicide groups, further exacerbating the challenge. Relying heavily on glyphosate to control Group 1- and 2-resistant populations puts great selection pressure on glyphosate. Although it is currently classified as low risk for developing resistance, to keep it that way, glyphosate should be used sustainably.

USE ALL YOUR HERBICIDES MORE EFFECTIVELY

A common misconception is that reducing overall glyphosate use will decrease the risk of herbicide resistance. In many cases, herbicides considered high risk for developing resistance are substituted for glyphosate, putting you at greater risk of developing herbicide-resistant weeds on your farm. Managing resistance isn’t about using less glyphosate – it’s about using herbicides effectively. Weeds outsmart habits, not systems.

When it comes to managing herbicide resistance, the use of tank mixtures can be more effective than alternating single-mode applications (i.e., rotating herbicides). Tank mixing glyphosate with another active ingredient can reduce the selection pressure on both herbicides.

PRE-SEED TANK-MIX APPLICATION: YOUR EASIEST TANK-MIXING OPPORTUNITY

The advantages of applying a pre-seed tank mix are numerous and include the following:

• Starting clean with a pre-seed burndown application helps reduce early-season weed pressure, which helps your crop get off to a good start.
• The pre-seed application is the easiest opportunity to include a tank mix in your herbicide program.
• Relying solely on glyphosate, or any one mode of action, to control weeds increases the risk of developing herbicide-resistant weeds. Using an effective tank-mix partner targets weeds with two or more modes of action at once, which reduces selection pressure for resistant weeds, and is important for preventing herbicide resistance.
• A pre-seed burndown application is an opportunity to manage volunteer glyphosate-tolerant canola by including an effective tank-mix partner.
• By using glyphosate as a base, you’re taking advantage of its effective weed control.
• Even in short rotations, such as canola-wheat, you can add diversity to your herbicide program by using tank mixes throughout the rotation.

THE VALUE OF RESIDUAL HERBICIDES

Including an effective residual herbicide in your pre-seed tank mix can help keep your fields clean longer, control later flushes of canola volunteers, and reduce the selection pressure for resistance to postemergence herbicides.

PRE-SEED HERBICIDE TANK-MIX OPTIONS FOR CROPS IN WESTERN CANADA

The following chart summarizes tank-mix partners recommended for use with Roundup WeatherMAX^® and Roundup Transorb^® HC herbicides. This is not a comprehensive list of products but gives some of the common products in the market. Always follow application rates, precautions, and restrictions indicated on product label instructions.

° Controls all types of canola volunteers. * Controls glyphosate-resistant kochia. † Provides residual control. See label for details.

Legal Statements

Bayer is a member of Excellence Through Stewardship^® (ETS). Bayer products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with Bayer’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. These products have been approved for import into key export markets with functioning regulatory systems. Any crop or material produced from these products can only be exported to, or used, processed or sold in countries where all necessary regulatory approvals have been granted. It is a violation of national and international law to move material containing biotech traits across boundaries into nations where import is not permitted. Growers should talk to their grain handler or product purchaser to confirm their buying position for these products. Excellence Through Stewardship^® is a registered trademark of Excellence Through Stewardship.

ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Performance may vary from location to location and from year to year, as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible and should consider the impacts of these conditions on the grower’s fields.

It is a violation of violation of federal law to use any pesticide product other than in accordance with its labeling. NOT ALL formulations of dicamba or glyphosate are approved for in-crop use with products with Roundup Ready 2 Xtend^® soybeans. ONLY USE FORMULATIONS THAT ARE SPECIFICALLY LABELED AND APPROVED FOR SUCH USES. Contact the Pest Management Regulatory Agency with any questions about the approval status of dicamba herbicide products for in-crop use with Roundup Ready 2 Xtend^® soybeans or products with XtendFlex^® Technology.

Roundup Ready^® 2 Technology contains genes that confer tolerance to glyphosate. Roundup Ready 2 Xtend^® soybeans contains genes that confer tolerance to glyphosate and dicamba. Glyphosate will kill crops that are not tolerant to glyphosate. Dicamba will kill crops that are not tolerant to dicamba. Contact your Bayer retailer, refer to the Bayer Technology Use Guide, or call the technical support line at 1-888-283-6847 for recommended Roundup Ready^® Xtend Crop System weed control programs.

Tank mixtures: The applicable labeling for each product must be in the possession of the user at the time of application. Follow applicable use instructions, including application rates, precautions and restrictions of each product used in the tank mixture. Bayer has not tested all tank mix product formulations for compatibility or performance other than specifically listed by brand name. Always predetermine the compatibility of tank mixtures by mixing small proportional quantities in advance. Bayer, Bayer Cross, Roundup Ready 2 Technology and Design^™, Roundup Ready 2 Xtend^®, Roundup Ready 2 Yield^®, Roundup Ready^®, Roundup Transorb^®, Roundup WeatherMAX^®, Roundup Xtend 2^™, Sencor^®, VaporGrip^®, XtendFlex^® and XtendiMax^® are trademarks of Bayer Group. Used under license. BlackHawk^® and Conquer^® are registered trademarks of Nufarm Agriculture Inc. All other trademarks are the property of their respective owners. Bayer Crop Science Inc. is a member of CropLife Canada. ©2022 Bayer Group. All rights reserved. 2023_41100