Agronomy Talk


Published on Thursday, September 10, 2020

The easiest weeds to control are those that never emerge. Cliché? Maybe. But as weeds continue to adapt, mounting resistance to herbicides builds every year. Sustainable control has become increasingly more challenging to achieve.

The over-reliance of a single site of action (SOA) continues to provide new challenges for weed control in soybeans with each growing season. XtendFlex® soybeans will help farmers focus on the basics of a sound weed management system — multiple SOAs and overlapping residuals, all without having to compromise performance and yield.

Sustainable weed control is only possible through the incorporation of a herbicide program that utilizes multiple effective SOAs. Beck’s multiyear Practical Farm Research (PFR)® data has demonstrated the impact and importance of utilizing a pre-emerge program with multiple SOAs (Figure 1). 

Above: Number of SOAs (Pre-Emerge) Influence on Waterhemp Control
from Beck’s Multi-Year Practical Farm Research (PFR)® data.


XtendFlex soybeans feature the benefits of the Roundup Ready® Xtend Crop System with the addition of tolerance to glufosinate. This allows access to multiple effective herbicides to manage each of your fields’ unique weed challenges. Beck’s PFR studies on the effectiveness of combining glufosinate and glyphosate show they are a powerful tool against tough-to-control waterhemp. 


Controlling weeds early with a pre-emergence application not only reduces the likelihood of developing resistance, but it also protects soybean yields. The overreliance on POST programs to control early-emerging weeds is unlikely to provide results and could cause yield losses of up to 2.5% for every growth stage you delay your applications. Put the Power in the Pre™ and let your preemergence applications do the heavy lifting. Post-emergence applications can then be used as rescue treatments for weed escapes.


In-season, Liberty® will provide effective postemergence control of weeds such as waterhemp, kochia, and giant ragweed. XtendFlex soybeans provide post-emergence tolerance to multiple SOAs to control resistant broadleaf weeds. Now farmers can confidently pursue higher yields by making early-season herbicide applications and maintain the option of spraying Liberty over-the-top once crops have emerged.  


Backed by uncompromising yield potential and outstanding agronomic performance in all maturities, XtendFlex® soybeans are built on the same proven genetic performance of high-yielding Roundup Ready 2 Xtend® soybeans, now with the power of Liberty herbicide. 

While weed control continues to provide new challenges with each growing season, you will have the option to bring the power to your soybean platform in 2021 with XtendFlex soybeans. The EPA is currently reviewing a new registration for XtendiMax® for the 2021 season and beyond.






*No dicamba may be used in-crop with seed in the Roundup Ready® Xtend Crop System, unless and until approved or specifically permitted by the U.S. EPA and the appropriate state agency for such use. As of August 2020, no dicamba formulations are currently registered by the U.S. EPA for in-crop use with seed in the Roundup Ready® Xtend Crop System in the 2021 season. Current stocks of low-volatility dicamba herbicides XtendiMax® herbicide, Engenia® herbicide, and FeXapan® herbicide previously approved for in-crop use with seed in the Roundup Ready® Xtend Crop System may not be used after July 31, 2020. Dicamba may harm crops that are not tolerant to dicamba. Contact the U.S. EPA and your state pesticide regulatory agency with any questions about the approval status of dicamba herbicides products for in-crop use with seed in the Roundup Ready® Xtend Crop System. NOTICE: DO NOT APPLY ANY HERBICIDE TO SEED IN THE ROUNDUP READY® XTEND CROP SYSTEM UNLESS IT HAS A PRODUCT LABEL SPECIFICALLY AUTHORIZING THAT USE. TO USE A HERBICIDE IN ANY MANNER INCONSISTENT WITH ITS LABELING IS A VIOLATION OF FEDERAL LAW. REFER TO THE BAYER TECHNOLOGY USE GUIDE FOR DETAILS AND RECOMMENDATIONS ON USING APPROVED ROUNDUP® BRANDED HERBICIDES ON SEED IN THE ROUNDUP READY® XTEND CROP SYSTEM.


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Author: Joe Bolte

Categories: Agronomy


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