Droplet Size


Managing Dicamba Drift 101


You have decided to plant dicamba-tolerant soybeans and now want to be sure you are ready to take the needed steps to ensure a solid return on your investment through more effective weed control. Using application techniques appropriate to new dicamba herbicide tank mixes will help protect yield potential while preserving the value of the technology for future seasons.

Follow the rules.  
Job one is to follow all label guidelines for tank-mixing herbicides before applying the mix to Roundup Ready 2 Xtend® soybeans or cotton with XtendFlex® technology. This means following directions for application timing and procedures, using approved nozzles, and in almost every case, adding a drift reduction agent (DRA) to the tank mix.
You’ll find lists of approved DRAs for each product on company websites. Specific requirements vary by state and can change over time, so double-check guidelines within a week of applying a low-volatility dicamba herbicide.
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Drift Reduction Agents (DRAs) 101. 
DRAs help reduce off-target applications by making spray droplets larger. Larger droplets are better able to penetrate the canopy to reach surfaces of target weeds, resulting in more effective control.

Larger droplets also means fewer droplets, so follow guidelines for spray volume to ensure good coverage. Most dicamba tank mixes should be applied at 15 gallons per acre, but be sure to check the label and consult your agronomist with any questions before making an application.
 
Aren’t all DRAs the same?
Even among approved DRAs, you will find performance differences. While all DRAs start out doing the job of increasing spray droplet size, some DRAs may not maintain that performance over time as they are subjected to recirculation within the spray tank.
 
Here’s why: Shear forces imposed on a spray solution moving through a spray system can cause DRAs to act differently. Some DRAs are more susceptible to shear forces, which reduces their ability to suppress fine droplets during application.
 
In testing multiple DRAs with new dicamba herbicide tank mixes using the WinField® United Spray Analysis System, we found some DRAs lost their ability to reduce the percent of driftable fines. However, OnTarget™ adjuvant continued to work after many revolutions through the spray pump.
 
We know OnTarget™ adjuvant will give you the best potential for return on your DRA investment based on comprehensive testing with the WinField® United Spray Analysis System, validated by in-field testing. The graph below shows reduced small particles in dicamba applications when OnTarget™ adjuvant was added to the tank mix.

 We have seen additional good results in field trials when OnTarget™ adjuvant and InterLock® adjuvant are used together in dicamba tank mixes. Adding InterLock® adjuvant at a rate of 1 to 2 ounces per acre will help improve consistency of spray droplet size for better coverage and performance.
 
Take time to plan your herbicide tank-mix strategy before application season heats up. Adding a DRA to a dicamba mix is the best way to get better return on your input investments and ensure good results from this needed weed-control technology for years to come.



XtendiMax® herbicide with VaporGrip® Technology is a restricted use pesticide. XtendiMax® herbicide with VaporGrip® Technology is not registered in all states and may be subject to use restrictions in some states. The distribution, sale, or use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. Check with your local Monsanto dealer or representative for the product registration status in your state.
 
ALWAYS READ AND FOLLOW DIRECTIONS FOR USE ON PESTICIDE LABELING. IT IS A VIOLATION OF FEDERAL AND STATE 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 Roundup Ready 2 Xtend® soybeans, Bollgard II® XtendFlex® or XtendFlex® cotton. ONLY USE FORMULATIONS THAT ARE SPECIFICALLY LABELED FOR SUCH USES AND APPROVED FOR SUCH USE IN THE STATE OF APPLICATION. XTENDIMAX® HERBICIDE WITH VAPORGRIP® TECHNOLOGY AND IN CROP USES MAY NOT BE APPROVED IN ALL STATES. Contact the U.S. EPA and your state pesticide regulatory agency with any questions about the approval status of dicamba herbicide products for in-crop use with Roundup Ready 2 Xtend® soybeans, Bollgard II® XtendFlex® or XtendFlex® cotton.
 
Roundup Ready 2 Xtend® soybeans contains genes that confer tolerance to glyphosate and dicamba. Bollgard II® XtendFlex® cotton contains genes that confer tolerance to glyphosate, dicamba and glufosinate. Glyphosate will kill crops that are not tolerant to glyphosate. Dicamba will kill crops that are not tolerant to dicamba.
 
Glufosinate will kill crops that are not tolerant to glufosinate. Contact your Monsanto dealer or refer to Monsanto’s Technology Use Guide for recommended weed control programs.
 
Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible.


 

Tips for Checking and Calibrating sprayers

  • Inspect nozzles for worn or broken tips.
  • Calibrate each nozzle to achieve the correct flow rate.
  • Compare all nozzles’ output for uniformity.
  • If you need assistance, contact your GreenPoint Sales Associate and ask for a sprayer walk-around.