Recommended practices for effectively using the new dicamba products from Andy Schmidt, WinField United regional agronomist
Costly lessons were learned last year when off-label dicamba formulations were applied to dicamba-tolerant soybeans. Along with soybeans, damage extended to a variety of fresh market crops, homeowners’ gardens, trees and more.
The most important takeaway was that crops outside of the new dicamba-tolerant system are inherently sensitive to extremely low concentrations of dicamba. While assessing the damage caused in 2016, it’s important to learn from these mistakes in order to successfully incorporate the new dicamba-tolerant soybean technology into our weed-control arsenals.
Respect the Herbicide
The most obvious cause of last season’s problem was the use of off-label dicamba treatments. While new dicamba-tolerant seed was available in 2016, dicamba herbicides for use with this technology were not yet labeled for use. With a growing number of tough, resistant weeds threatening soybean yields, some operations jumped the gun by making off-label applications with older dicamba formulations.
Along with applying off-label dicamba formulations, several other factors likely played a role in setting the stage for damage to neighboring crops, including the use of the wrong-size spray tips, which allowed fine spray droplets to easily drift off target. Other causes may have been application timing errors, such as spraying when conditions were conducive to temperature inversions. Another culprit could have been the use of ammonium sulfate (AMS) as a water conditioner in the tank mix, which would have increased the potential for volatility.
Follow Specific Guidelines
During spray clinics conducted by WinField United agronomists this winter, we provided some recommended practices for use with dicamba-tolerant soybeans to help farmers successfully add this new weed-management tool to their production system. These guidelines include the following:
- Only use newly registered dicamba formulations labeled for use with dicamba-tolerant soybeans. Older dicamba formulations are more volatile, making off-target movement more likely.
- Read and understand the new dicamba product labels. These labels are the law and closely define how the product must be used.
- Consider the required combinations of products listed on the labels. XtendiMax® With VaporGrip® Technology for example, requires an approved drift reduction agent like AG16098 from WinField United in the mixture when certain other herbicides and adjuvants are used. AG16098 is specifically designed for use with the new dicamba herbicide chemistries, including Engenia™ Herbicide from BASF, to help control drift, coverage and efficacy of applications.
- Avoid adding AMS to the spray tank as it may increase volatility. An approved water conditioner like Class Act® Ridion™ can be used to protect herbicides in hard water and increase herbicide activation on the plant.
- Use the correct nozzle type listed on the label to achieve ultra-coarse droplets. Also use the labeled pressure rate and don’t exceed the pressure limit.
- Pay careful attention to the volume of water sprayed per acre. Consult your local agronomist to ensure adequate water carrier volumes for the products and scenerios you’re working with.
- Keep boom heights at no higher than 24 inches above the target. A lower boom height helps spray droplets stay out of the wind and remain on target.
- Slow down. Maintaining the right ground speed helps control boom height and keeps spray pressures in check.
- Understand your surroundings and know the current wind speed and direction. If a highly susceptible crop is nearby, do not spray dicamba products. Use other labeled herbicides to treat your field.
- Maintain buffer zones when sensitive areas are downwind. Follow buffer recommendations listed on the label.
Dicamba-tolerant soybean technology can be an excellent part of an overall weed management strategy, but we all need to pay close attention to application details to maintain its effectiveness. Your local WinField United retailer can help you determine the appropriate products and practices for your operation. You can also visit dicambaanswers.com for more information.
WinField and Class Act are registered trademarks and WinField United and Ridion are trademarks of Winfield Solutions, LLC. VaporGrip® and XtendiMax® are registered trademarks of Monsanto Technology LLC. Engenia™ is a trademark of BASF.