• Crop Protection
  • Feb 28, 2022

4 Tips for Successful Weed Control

Sprayer applying herbicides in a soybean field.

Spring is almost here, and you know that the emergence of troublesome weeds won’t be far behind. If you haven’t done so already, talk with your local trusted advisor about your weed-control strategy for this season. Here are a few tips to keep in mind as you formulate a plan to tackle weeds throughout their growth cycles.

1. Look at last year.

Evaluate the performance of your 2021 weed-control strategy to see what worked well and what you’d like to change. Identify last year’s most prevalent weeds and create your plan for controlling them first. Your local agronomist can equip you with resources — for example, university research and Answer Plot® data — that can help inform good agronomic and economic decisions for your fields.

2. Start with a clean field at planting.

Use tillage or a burndown application to get crops off to a weed-free start. An effective herbicide strategy consists of using multiple modes of action, correct herbicide rates and timely postemergence applications. In no-till cropping systems, I usually recommend planning for a fall burndown. Fall-emerging marestail is very difficult to control with herbicides in the spring, especially in parts of the Midwest. If you didn’t do a fall burndown, your spring burndown will need to include the right modes of action to manage problematic winter annuals and/or marestail.
I recommend using three effective modes of action for any weed-management program. This strategy consists of residuals and postemergence herbicides. The postemergence herbicides should be applied in a timely manner and offer another residual to protect against later-emerging weeds such as waterhemp and Palmer amaranth. This can be an effective strategy for both traditional tillage and no-till systems. Be sure to check herbicide labels for plant growth restrictions on postemergence herbicides.  

3. Choose the right adjuvant.

In 2022, we’ll be faced with supply constraints and increasing weed resistance, so it will be even more critical to get weed control right on the first pass. Don’t risk your crop protection investments to low-quality adjuvants. Every inch of weed growth is worth $25-60 per acre, so choosing the right adjuvant for whatever herbicide chemistry you use is key. Our performance lineup are up for the challenge, providing reliable effectiveness to help you tackle the season ahead:

  • UltraLock™ adjuvant is an all-purpose drift and deposition aid that uses a new crop-based oil formulation to substantially reduce drift and deliver more droplets per diameter for exceptional weed control.
  • InterLock® adjuvant works effectively with a range of herbicides to improve spray deposition and manage drift. 
  • OnTarget® adjuvant is designed specifically for use with dicamba herbicide chemistries to reduce driftable fines and enhance canopy penetration.
  • Class Act® NG® adjuvant is a water conditioner and surfactant spreader sticker designed to promote fast, aggressive weed control when mixed with glyphosate and glufosinate-based herbicides.
  • Destiny® HC oil adjuvant optimizes the performance of most post-emergent herbicides, using CornSorb® technology for improved absorption and uptake. 

4. Know your weed emergence schedule.

As previously mentioned, marestail can emerge in the fall, but it’s one of the earlier weeds to appear in the spring. Another early emerger is giant ragweed. With these weeds, an early burndown application is important to achieve adequate control. Waterhemp and Palmer amaranth take a little longer to develop, from early spring to peak emergence in June and early July, so make sure to use an effective preemergence herbicide as well as a layered residual herbicide postemergence for strategic weed management.
Large weeds result in limited options and higher costs for you. It pays to be proactive and consistent to achieve season-long weed control. Contact your local trusted advisor to get an early start on successful weed control.
All photos are either the property of WinField United or used with permission.

© 2022 WinField United. Important: Before use always read and follow label instructions. Crop performance is dependent on several factors many of which are beyond the control of WinField United, including without limitation, soil type, pest pressures, agronomic practices and weather conditions. Growers are encouraged to consider data from multiple locations, over multiple years and to be mindful of how such agronomic conditions could impact results. Answer Plot, UltraLock, InterLock, OnTarget, Class Act NG, Destiny HC, CornSorb and WinField are trademarks of WinField United. All other trademarks are the property of their respective owners.


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