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Weed Management in Roundup Ready 2 Xtend® Soybeans

Posted 5/13/2018
Recent research shows that soybean yield loss from weed competition occurs earlier in wide versus narrow row spacing. The critical period for weed removal in soybeans ranges from the V1, V2 or V3 soybean growth stages for 30, 15, or 7.5 inch on row spacing, respectively.

Roundup Ready® Xtend Crop System

The Roundup Ready Xtend Crop System, which includes Roundup Ready 2 Xtend® Soybeans, is a weed management system that combines dicamba– and glyphosate-tolerance traits with herbicide applications. The system includes the use of XtendiMax® herbicide with VaporGrip® Technology, a restricted use pesticide, which is a new formulation of dicamba that significantly reduces volatility. The herbicide helps to manage tough-to-control broadleaf weeds that includes glyphosate-resistant Palmer amaranth, waterhemp, and marestail (horseweed). XtendiMax herbicide with VaporGrip Technology provides application flexibility and can be applied before, at, and after planting of Roundup Ready 2 Xtend Soybeans.

Burndown and Early-Season Weed Control

Early in the season is a critical time to control weeds in soybeans. Starting with a clean field at planting is an essential step for proper weed management. A preplant burndown herbicide treatment helps to remove early weed infestations. Allowing weeds to be present at planting because of skipping or delaying the burndown herbicide application can give weeds a competitive advantage with
the crop.

A significant portion of soybean yield can be at risk if early-emerging weeds are allowed to compete with the crop during the first 30 days after planting. Weeds should be removed by the V2 or V3 stage of soybean development (generally 20-30 days after planting), when weeds are less than 4 inches tall. Soybeans are susceptible to shading by weeds and weeds compete with soybeans for nutrients and water.

Preemergence (PRE) herbicides with residual activity applied preplant or at planting can help to control weeds into the growing season. Residual herbicides also help provide control of glyphosate-resistant weeds and allow for more flexible postemergence (POST) herbicide application timing. Using PRE residual herbicides plus planned POST herbicide applications is generally the best approach to avoid losses from early-season weeds and help protect soybean yield potential.

Weed Management Solutions

Establishing a robust weed management program is essential to maintaining farm productivity and reducing weed populations and weed proliferation. Starting the growing season clean and applying herbicides when weeds are actively growing and less than 4 inches tall significantly improves efficacy. In minimum tillage situations, apply XtendiMax herbicide with VaporGrip Technology (22 or 44 oz/A) plus Roundup PowerMAX® Herbicide (32 oz/A) and an approved drift reducing agent (DRA) with a soil residual herbicide (Group 14 or 15) early in the season for burndown or prior to planting. In conventional tillage situations, especially under dry conditions, apply XtendiMax herbicide with VaporGrip Technology tank mixed with a soil residual herbicide (Group 14 or 15) early in the season at planting. Within 20-30 days after soybean planting when weeds are less than 4 inches tall, a POST application of XtendiMax herbicide with VaporGrip Technology (22 oz/A) plus Roundup PowerMAX Herbicide (32 oz/A) and an approved DRA with Warrant® Herbicide (3 pts/A) or Warrant® Ultra Herbicide (50 oz/A) is recommended to control continuous germination of problematic weed species like Palmer amaranth, marestail, and waterhemp.

Knowledge of the weed species in a field and their emergence pattern can be used to develop effective herbicide programs and other management practices to minimize potential yield losses, herbicide resistance, and contain aggressive weed species.

Visit www.RoundupReadyPLUS.com for specific localized weed management recommendations.

General Weed management recommendations for
Roundup Ready 2 Xtend® Soybeans.1
Burndown Roundup PowerMAX® Herbicide (32 oz) + XtendiMax® herbicide with VaporGrip®
Technology (22-44 oz) + labeled Drift Reducing Agent (DRA)
PRE at planting2 Palmer amaranth
POST3,4
(ideally 20-30 days after planting when weeds are less than 4 inches in height)
Roundup PowerMAX® Herbicide (32 oz) + XtendiMax® herbicide with VaporGrip®
Technology (22 oz) + labeled DRA +
• Warrant® Herbicide (3 pt) or
• Warrant® Ultra Herbicide (50 oz)

If necessary, follow-up with an additional labeled herbicide treatment postemergence to control any weed escapes.

Always refer to product labels for use rates, application guidelines, and rotational crop restrictions. Visit www.RoundupReadyPLUS.com web site for specific local recommendations.

1. PRE herbicides may also include other herbicides based on local weeds and preferences. Roundup PowerMAX herbicide, Gramoxone® SL herbicide, or XtendiMax herbicide with VaporGrip Technology may be needed for burndown of existing weeds.


2. Two applications of Warrant Herbicide can be applied per season, one application of Warrant Ultra Herbicide can be applied per season, or one application of Warrant Herbicide and one application of Warrant Ultra Herbicide can be applied per season on the same acre. See label for Warrant Ultra Herbicide for rate, geography, and use restrictions.

3. The maximum combined total amount for XtendiMax herbicide with VaporGrip Technology is 88 fluid ounces per acre per year. See state and local recommendations for XtendiMax herbicide with VaporGrip Technology application window.

Check with your local Monsanto dealer or representative or U.S. EPA and your state pesticide regulatory agency for the product registration status and additional restrictions in your state.

 

Visit the Incentive Calculator to calculate your potential incentives with Roundup Ready Plus Crop Management Solutions.