Limit Drift to Realize Benefits of New Dicamba System
Sponsored by: WinField United
Q&A with Ryan Wolf, WinField United agronomy manager
Q: Are there any hazards growers and applicators should be aware of when adopting the new dicamba system?
A: With the exception of dicamba-tolerant soybeans and cotton, most crops are highly sensitive to extremely low doses of dicamba. Drift is the physical movement of spray particles coming off the boom during application. As spray droplets exit the nozzle, they’re affected by environmental conditions such as wind. If gravity can’t overcome any prevailing breeze, physical drift can occur.
Currently, two low-volatility herbicide products are labeled for use with dicamba-tolerant crops – XtendiMax® With VaporGrip® Technology from Monsanto and Engenia™ Herbicide from BASF. To mitigate damage to non-target crops, labels for the new products provide detailed guidelines for minimizing dicamba drift and volatility.
Q: What steps should be taken to minimize potential drift when applying these new dicamba herbicides?
A: To help minimize potential drift, the two new product labels limit application to certain wind speeds and caution applicators to watch for possible temperature inversions. Because each label differs slightly on wind regulations, it’s important to follow the recommendations exactly as stated on the product being used in order to avoid damage to sensitive neighboring crops.
A number of environmental factors can cause volatility to occur, making it difficult to predict. Volatility occurs as the spray droplet dries on the leaf surface. During spray evaporation, the physical particles change to a gaseous form that is capable of moving in wind to neighboring fields. The new dicamba herbicides developed for use with this system include low-volatility formulations that significantly reduce volatility potential.
Adjuvants are also recommended for effective drift management with the dicamba-tolerant system. It is important to understand the required combination of products that is listed on the two labels. With XtendiMax® With VaporGrip® Technology, an approved drift reduction agent (DRA) must be in the mixture when certain other herbicides and adjuvants are used. DRAs, such as AG16098 adjuvant from WinField United, are specifically designed for use with ultra- and extra-coarse nozzles, and the new dicamba herbicide chemistries.
Because label changes are continuing to be made, users are required to review the online label no more than seven days prior to making an application. Knowing current tank-mix requirements will help ensure that your application plans follow label requirements.
Q: How can growers and applicators best minimize future weed-resistance and extend the life of this new technology?
A: Application rules for XtendiMax® With VaporGrip® Technology and Engenia™ Herbicide also extend to weed-resistance management. Weed resistance to the new herbicides can develop quickly if only partial control is achieved with each application. However, when the exact rates and application procedures on the product labels are followed, weed-resistance issues should be minimized.
While the dicamba-tolerant crop system is a welcome addition to current weed-control programs, it’s only one part of the long-term solution. To remain effective and provide expected weed control, the new dicamba products should be part of a diversified weed-control strategy that includes multiple modes of action, paired adjuvants and recommended best management practices.
To get more information on how to best adopt these new dicamba technologies, contact your local WinField United retailer or visit www.dicambaanswers.com.
WinField is a registered trademark and WinField United is a trademark of Winfield Solutions, LLC.
VaporGrip® and XtendiMax® are trademarks of Monsanto Technology LLC.
Engenia™ is a trademark of BASF.