Weed Management and Application Best Practices

There’s a lot to think about before you run your sprayer through your fields. That’s why we’ve created this quick-step guide to help you use your sprayer as effectively and confidently as possible—including use of the Roundup Ready® Xtend Crop System. Always read and follow the product label before applying a product.

Step One:      Check Your Weeds
Step Two:      Check Neighboring Crops
Step Three:   Check the Weather
Step Four:     Determine the Right Tank Mix
Step Five:      Check and Calibrate Your Sprayer
Step Six:        Choose the Right Nozzle
Step Seven:  Use the Right Droplet Size
Final Step:     Clean the Sprayer

 

Check Your Weeds

A holistic weed management approach for all your crops will help you manage tough, resistant weeds and optimize yield potential.



Weed management and resistance prevention tips
  • Plant into weed-free fields and keep fields as clean as possible throughout the season.
  • Scout fields regularly to catch weeds before they are too large to control.
  • Use at least three different modes of action (MOA) to ensure your herbicides are effective against the field’s toughest weeds.
  • Always follow herbicide label instructions exactly—especially when using dicamba products.
  • Incorporate diverse practices such as cultivation, crop rotation and competitive crops.
Learn More Resources
Locking in Spray Investments Dicamba herbicides labeled for use with the Roundup Ready® Xtend Crop System:
Your Guide to Sprayer Technology XtendiMax® with VaporGrip® Technology
3 Biggest Mistakes Applicators Make Engenia®
7 Products You Shouldn’t Go Without at Spray Time FeXapan™ Herbicide plus VaporGrip® Technology
Getting Ahead of Resistant Weeds  Roundup Ready® Recommendation Tool
  Take Action tool


Check Neighboring Crops

Before making a herbicide application, check with neighbors to see which crop systems are planted near your fields. Pay close attention to crop sensitivities, spray guidelines and regulations on the product label to avoid off-target movement and crop damage.



Tips for working with neighbors
•     Openly communicate with neighbors about what — and when —  you will be spraying.
•     Locate fields that contain crops sensitive to your preferred herbicides.
•     Check labels for buffer zone requirements to avoid spray drift damage.
 


Check the Weather

Always check weather conditions before spraying to avoid causing crop damage. Wind and temperature inversions can easily cause spray particles to reach nearby sensitive crops — this is especially important when using dicamba products.



Weather-related spraying tips
  • Check herbicide product labels and follow wind speed regulations for spraying.
  • Use drift-control adjuvants such as InterLock®, or AccuDrop™ or OnTarget™ to help minimize drift potential.
  • Maintain the required buffer zones when sensitive areas are downwind.

Drift Control Adjuvants
Dicamba-Specific Resources  


Determine The Right Tank Mix

Once you’ve determined which crop protection products you need, how they’re added to the tank—the proper mixing order—can eliminate problems such as equipment damage, time lost and wasted inputs, and can ensure product compatibility and performance. Always start with a jar compatibility test first before using a new tank mix.
 
Tips for proper tank mixing
Always read and follow product label recommendations for mixing when applicable.
Use the WALE or DALE method for correct mixing order.
  • W or D: add wettable powders, water dispersible granules, dry flowables
  • A: Agitate tank mix
  • L: Add liquid chemicals​
  • E: Add emulsified concentrates

Resources  


Check and Calibrate Your Sprayer

Inspect and calibrate application equipment carefully — and regularly — to ensure accurate application rates, reduce drift potential and optimize your spray investment.



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 WinField United retailer or representative and ask for a sprayer walk-around.
Resources  


Choose the Right Nozzle

Choosing the right nozzle for the product you’re spraying is essential. Each nozzle type has a pressure range designed to create the correct droplet size for your tank mix to help ensure optimal coverage for your fields — including the end rows.



Tips for nozzle selection and use
  • Review product label recommendations and determine the desired droplet size, pressure and gallons per acre (GPA).
  • Stay within the right pressure range for your nozzle when applying.
  • Regularly check nozzles throughout the season for wear and replace as needed.

Resources  


Use the Right Droplet Size

The correct droplet size keeps the maximum amount of spray on the intended target. Too fine, and spray can easily drift off target or evaporate. Too large, and it can run or bounce off leaf surfaces. Keep in mind, tank-mix partners can change the drift potential and, in turn, the droplet size you need to spray.
 
Tips for optimizing droplet size
  • Droplets within the 200 to 450 micron range will help decrease drift potential and optimize coverage and deposition.
  • To prevent evaporation, do not use droplets less than 50 microns.
  • A variety of adjuvants, such as InterLock® or AccuDrop™, are available to optimize droplets to control drift, improve product adhesion and coverage, increase surface penetration and product uptake, condition water, and more.
  • OnTarget™ adjuvant was specifically designed for use with ultra- and extra-coarse nozzles and the new dicamba chemistries to help reduce driftable fines.

Droplet size makes a difference
Advantages and disadvantages of various droplet sizes. Equivalent droplet volume in each quandrant.*

100 MICRON 350 MICRON
Advantages
+ Excellent coverage
+ Low droplet bounce/shatter
Advantages
+ Good coverage
+ Moderate evaporation
+ Low drift potential
+ Good canopy penetration
+ Favorable drying time on leaf
+ Good efficacy for many pesticides
Disadvantages
- Very fast evaporation
- Quick drying time on leaf
- Very high drift potential
- Poor canopy penetration
Disadvantages
- Some droplet bounce/shatter
200 MICRON 600 MICRON
Advantages
+ Very good coverage
+ Low droplet bounce/shatter
+ Good efficacy for contact pesticides
Advantages
+ Long evaporation
+ Very low drift potential
+ Good canopy penetration
+ Long drying time on leaf
Disadvantages
- Fast evaporation
- Fast drying time on leaf
- High drift potential
- Moderate canopy penetration
Disadvantages
- Low coverage
- High droplet bounce/shatter
- Reduced efficacy for many pesticides
 
Regardless of which droplet size you need, using the right nozzle and adding an adjuvant to the tank will increase the number of right-sized droplets you are seeking. 
*Relative comparisons. Results vary depending on environment, product included, adjuvants, canopy characteristics and other factors. 
 
Resources Adjuvant Resources
In the Air Reduce drift
Deposition and Drift Control OnTarget™ drift control adjuvant for use with dicamba herbicides
Managing New Spray Technologies InterLock® drift and deposition control adjuvant
How to Read a Leaf AccuDrop™ drift control adjuvant
  Surfactants 
  Water Conditioners



Clean the Sprayer

Starting and ending with a clean sprayer is essential for successful spray applications. Eliminating spray residue helps reduce the potential for crop injury and product incompatibility, along with decreasing applicator liability risks.



Tips for sprayer cleaning
  • Empty the spray tank completely, spraying all the material in the field.
  • Rinse tanks immediately after use. For some products, such as the new dicamba herbicides, triple rinsing before applications is also required to ensure no AMS residue remains from previous applications.
  • Nozzles, screens and strainers should be removed and cleaned separately.
  • Clean tanks with water, tank cleaners such as ProTank® (link) and ammonia; check each label for specific requirements.
  • Tank cleaners should be thoroughly circulated for 15 to 20 minutes.
  • For herbicides that take longer to release from surfaces, allow the cleansing solution to remain on affected surfaces for 12 to 24 hours before rinsing.
  • Finish interior cleaning by flushing thoroughly with clean water after the cleaning solution has been drained.

Resources

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 the product label before applying a product.
 
©2017 Winfield Solutions, LLC. All Rights Reserved. Privacy & Terms
Products promoted on WinFieldUnited.com are available for a sale in the United States only.
For information on these products in other countries, please contact winfieldcustomerservice@winfieldsolutions.com