TRIAL OBJECTIVE

  • Volunteer canola is challenging to manage in each crop and can be especially challenging for soybean crops with weak crop competition early in the season.
  • Growers are looking for cost effective weed management solutions.
  • The goal of this research was to position an effective, cost-effective residual and in-crop program to support technical recommendations towards a volunteer canola management program in soybeans.

RESEARCH SITE DETAILS

  • This trial included 12 and 13 treatments in 2019 and 2018, respectively. There were three replications, set up in a randomized complete block design.
  • 2 application timings:
    • A – PRE emerge
    • B – V3 to V4 stage soybeans
  • 3 control ratings:
    • 14 days after ‘A’ application timing (DAA),
    • Zero days after ‘B’ application timing (DAB),
    • 28 to 35 DAB
  • 7 locations:
    • 4 internal (Oakville, Manitoba; Brandon, Manitoba; Yorkton, Saskatchewan; and Carseland, Alberta)
    • 3 external (Portage la Prairie (2 locations), Manitoba; and near Saskatoon, Saskatchewan)
  • Previous crop was Roundup Ready® canola, with Roundup Ready 2 Xtend® soybeans following.
  • Except for the Roundup Xtend® herbicide premix (see Treatment 5 in the 2019 treatments listed below), treatments included an application of Roundup WeatherMAX® herbicide at 0.67 L/acre.

UNDERSTANDING THE RESULTS

Photos taken 40 days after ‘A’ application (left)
XtendiMax® with VaporGrip® Technology herbicide (600 g) PRE followed by imazamox (20 g) POST
Photos taken 11 days after ‘B’ application (right) Express SG Burndown.
Express® SG herbicide (7.5 g) plus XtendiMax® with VaporGrip® Technology herbicide (600 g) PRE followed by imazamox (15 g) POST
Figure 1. Photos taken 40 days after ‘A’ application (left) and 11 days after ‘B’ application (right) Express® SG Burndown.

Photos taken 40 days after ‘A’ application (left)
Express® SG (7.5 g) plus XtendiMax® with VaporGrip® Technology herbicide (2 L/acre) plus Sencor® 75 DF herbicide (275 g) PRE.
Photos taken 11 days after ‘B’ application (right). XtendiMax® with VaporGrip® Technology herbicide and Sencor® 75 DF herbicide.
Express® SG (7.5 g) plus XtendiMax® with VaporGrip® Technology herbicide (2 L/acre) plus Sencor® 75 DF herbicide (550 g) PRE.
Figure 2. Photos taken 40 days after ‘A’ application (left) and 11 days after ‘B’ application (right). XtendiMax® with VaporGrip® Technology herbicide and Sencor® 75 DF herbicide. Source: Western Canada Market Development Trial Oakville, Manitoba.
Table 1. Herbicide treatment list from 2018 trial.
2018 Treatment Herbicide Application
1 Roundup WeatherMAX® herbicide PRE and POST
2 Heat® herbicide PRE and Viper® ADV herbicide POST
3 Heat® herbicide PRE and imazamox (15 g) POST
4 XtendiMax® with VaporGrip® Technology herbicide PRE and Viper® ADV herbicide POST
5 XtendiMax® with VaporGrip® Technology herbicide PRE and imazamox (15 g) POST
6 XtendiMax® with VaporGrip® Technology herbicide PRE and imazamox (20 g) POST
7 Express® SG herbicide + XtendiMax® with VaporGrip® Technology herbicide PRE f/b imazamox (15 g) POST
8 Valtera™ herbicide + XtendiMax® with VaporGrip® Technology herbicide PRE
9 Express® SG herbicide + Valtera® herbicide + XtendiMax® with VaporGrip® Technology herbicide PRE
10 Express® SG herbicide + Bifecta® herbicide + XtendiMaxM® with VaporGrip® Technology herbicide PRE
11 Express® SG herbicide + Fierce® herbicide + XtendiMax® with VaporGrip® Technology herbicide PRE
12 XtendiMax® with VaporGrip® Technology herbicide + imazethapyr PRE
13 XtendiMax® with VaporGrip® Technology herbicide + Sencor® herbicide + imazethapyr PRE

*XtendiMax® with VaporGrip® Technology herbicide rate was 600 g ae/hectare in each case. Imazamox was applied at 15 and 20 g rates as indicated. Other herbicides were applied at typical labeled rates.
*XtendiMax® with VaporGrip® Technology herbicide rate was 600 g ae/hectare in each case. Imazamox was applied at 15 and 20 g rates as indicated. Other herbicides were applied at typical labeled rates.

Figure 3. Percent volunteer canola control from herbicides applied PRE (application timing ‘A’) and POST at V3 to V4 soybean growth stage (application timing ‘B’). Evaluation was taken 28 to 35 days after ‘B’ treatment which occurred between July 25th and August 14th. Source: Seven locations from Western Canada Market Development Trials in 2018.

Table 2. Herbicide treatment list from 2019 trial.
2019 Treatment Herbicide Application
1 Roundup WeatherMAX® herbicide PRE and POST
2 XtendiMax® with VaporGrip® Technology herbicide PRE f/b imazamox (20 g) POST
3 XtendiMax® with VaporGrip® Technology herbicide and Express® SG herbicide PRE f/b imazamox (15 g) POST
4 XtendiMax® with VaporGrip® Technology herbicide PRE
5 Roundup Xtend® herbicide PRE
6 Roundup Xtend® herbicide and Pursuit® herbicide (15 g) PRE
7 Roundup Xtend® herbicide and Pursuit® herbicide (25 g) PRE
8 Roundup Xtend® herbicide PRE f/b Viper® ADV herbicide POST
9 Roundup Xtend® herbicide + Sencor® herbicide (275 g) + Express® SG herbicide PRE
10 Roundup Xtend® herbicide + Sencor® herbicide (550 g) + Express® SG herbicide PRE
11 Roundup Xtend® herbicide + Focus® herbicide PRE
12 Engenia® herbicide + Heat® herbicide + Zidua® SC herbicide PRE

*XtendiMax® with VaporGrip® Technology herbicide rate was 600 g ae/hectare in each case. Imazamox was applied at 15 and 20 g ai/hectare rates as indicated. Other herbicides were applied at typical labeled rates.
*XtendiMax® with VaporGrip® Technology herbicide rate was 600 g ae/hectare in each case. Imazamox was applied at 15 and 20 g rates as indicated. Other herbicides were applied at typical labeled rates.

Figure 4. Percent volunteer canola control from herbicides applied PRE (application timing ‘A’) and POST at V3 to V4 soybean growth stage (application timing ‘B’). Evaluation was taken 28 to 35 days after ‘B’ treatment which occurred between July 30th and September 5th. Source: Seven locations from Western Canada Market Development Trials in 2019.

KEY LEARNINGS

  • In this trial, XtendiMax® with VaporGrip® Technology herbicide at 0.7 L/acre provided suppression of volunteer canola two weeks after application (75 – 80% control) and maintained approximately 60% activity at B rating.
    • High rates (0.7 L/acre) of dicamba suppresses volunteer canola growth
  • A follow-up application of an in-crop Group 2 herbicide provided excellent season-long control of volunteer canola.
    • Imazamox, Viper® ADV herbicide, or a premix of imazamox and bentazon active ingredients are Group 2 herbicide options.
  • Express® SG herbicide can be an effective burndown option for emerged canola.
  • In this trial, Express® SG herbicide, XtendiMax® with VaporGrip® Technology herbicide, and Sencor® herbicide gave the best control for single-application programs.
  • Further research is needed to evaluate whether Sencor® herbicide rates of 275 or 550 g ai/hectare should be used in the Red River Valley for volunteer canola control.
  • Roundup Xtend® with VaporGrip® Technology herbicide and the half rate of imazethapyr PRE was effective approximately 80% control throughout the season.
  • There was better activation of the PRE residual herbicides in trail data from 2018 compared to 2019.
  • Focus® herbicide improved volunteer canola control when partnered with Roundup Xtend® with VaporGrip® Technology herbicide.

Legal Statements

The information discussed in this report is from a multiple site, replicated demonstration. This informational piece is designed to report the results of this demonstration and is not intended to infer any confirmed trends. Please use this information accordingly.

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 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® 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 1-800-667-4944 for recommended Roundup Ready® Xtend Crop System weed control programs.

Bayer, Bayer Cross, Roundup Ready 2 Xtend®, Roundup Ready 2 Yield®, Roundup Ready®, Roundup WeatherMAX®, Roundup Xtend®, Sencor®, VaporGrip®, XtendFlex® and XtendiMax® are registered trademarks of Bayer Group. Used under license. Valtera™ is a trademark of Valent U.S.A. CorporationAll other trademarks are the property of their respective owners. Bayer CropScience Inc. is a member of CropLife Canada. ©2021 Bayer Group. All rights reserved. 1020_R4_CA

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