Herbicide Recommendations to Control Volunteer Glyphosate Tolerant Canola in Genuity® Roundup Ready 2 Yield® Soybeans TECHNICAL BULLETIN Based on Monsanto Canada TD Trials from 2013-2014, there are at least 20 volunteer control treatments, all with greater than 90% control, for managing glyphosate tolerant (GT) canola volunteers in Genuity® Roundup Ready 2 Yield® soybeans. The best way to manage GT canola volunteers is to start clean with a pre-plant burndown tank mix, and if needed, an in-crop application to manage flushing GT volunteer canola. Two-pass weed management for GT volunteer canola will help diversify your weed management program; apply multiple modes of action on every acre to Start Clean & Stay Clean. Recommended pre-seed/pre-emergence tank mixes: ® ® Understanding volunteer canola: The majority of volunteer canola seedlings emerge the year after growing a canola crop.1, 2 The density of volunteers depends on weather, harvest timing, crop competiveness, previous volunteer management and other factors. Following canola with a cereal or corn crop provides many excellent herbicide options to control volunteers. In recent years, many volunteer canola control options have become available for use in Genuity Roundup Ready 2 Yield soybeans. Recommended in-crop tank mixes: ® Roundup Transorb HC + Heat herbicide Roundup WeatherMAX® + Viper ADV herbicide Herbicide group 14 Herbicide groups 2 and 6 Zero documented cases of group 14 herbicide resistance in Western Canada Excellent option with the most re-cropping flexibility the following year, including canola Effective tank mix that provides two modes of action on many broadleaf weeds Effective tank mix provides multiple modes of action on a broad spectrum of weeds, including wild oats Roundup Transorb HC + Valtera ™ herbicide ® Roundup WeatherMAX + Odyssey herbicide Herbicide group 14 Herbicide group 2 Zero documented cases of group 14 herbicide resistance in Western Canada Provides residual control of flushing volunteers Provides residual control of many broadleaf weeds Canola (excluding Clearfield) should not be seeded the year after an Odyssey application Residual effects help reduce later flushes and provides incrop application flexibility ® Roundup WeatherMAX + Reflex herbicide Herbicide group 14 Effective tank mix that provides two modes of action on many broadleaf weeds Reflex is only registered for use in the Manitoba Red River Valley Image source: University of Saskatchewan, 2014. ® ® Treatment: Roundup WeatherMAX + Heat PRE, ® Roundup WeatherMAX + Viper ADV POST Visit www.rrwms.ca Two-Pass Volunteer GT Canola Control Treatments Two pass programs provide excellent control of volunteer GT canola over a broad geography (28-35 DAT) ® Note: All treatments were tank-mixed with a Roundup brand agricultural herbicide. Source: Monsanto Canada TD Trials 2013-2014, n=9 General Tips for Effective Control: Small volunteer canola (<4 leaf) is easier to control than large volunteer canola. Ensure proper spray coverage when utilizing contact herbicides such as Heat. Heat, Viper ADV, Odyssey and Reflex will work best when applied to emerged volunteer canola. Valtera is a residual herbicide that requires moisture after application; it is best to apply prior to volunteer emergence. Summary: Most volunteer canola emerges in the year following a canola crop. Crop rotation allows for more herbicide diversity to manage a broad spectrum of weeds, including volunteer canola. Newer tank mix options are now available for use in Genuity Roundup Ready 2 Yield soybeans that effectively manage canola volunteers. Sources: 1 Gulden, R.H., S. J. Shirliffe, and A. G. Thomas. 2003. Secondary seed dormancy prolongs persistence of volunteer canola in Western Canada. Weed Sci. 51:904-913 2 Harker, K. N., G. W. Clayton, R. E. Blackshaw, J. T. O’Donovan, E. N. Johnson, Y. Gan, F. A. Holm, K. L. Sapsford, R. B. Irvine and R. C. Van Acker. 2006. Presistence of glyphosate-resistant canola in Western Canadian cropping systems. Agron. J. 98: 107-119 3 Monsanto Canada TD Trials, 2013-2014, n=6 4 Monsanto Canada TD Trials, 2013, n=7 Monsanto Company is a member of Excellence Through Stewardship® (ETS). Monsanto products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with Monsanto’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. Commercialized products have been approved for import into key export markets with functioning regulatory systems. Any crop or material produced from this product 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 this product. Excellence Through Stewardship® is a registered trademark of Excellence Through Stewardship. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Roundup Ready® crops contain genes that confer tolerance to glyphosate, the active ingredient in Roundup® brand agricultural herbicides. Roundup® brand agricultural herbicides will kill crops that are not tolerant to glyphosate. 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. Monsanto 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. Genuity®, Monsanto and Vine Design®, Roundup Ready 2 Yield®, Roundup Ready®, Roundup Ready®, Roundup Transorb®, Roundup WeatherMAX® and Roundup® are registered trademarks of Monsanto Technology LLC, Monsanto Canada, Inc. licensee. All other trademarks are the property of their respective owners. ©2015 Monsanto Canada Inc. Visit www.rrwms.ca
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