Dec. 1, 2017
US state of North Dakota has finished new protocols for three formulations of the herbicide Dicamba, which had been implicated last year in damage to adjacent crops due to unintended drift.
Growers in 28 North Dakota counties reported problems with drift that they believed related to Dicamba use, mainly in June and early July.
The restrictions will apply only to applications made on soybeans with XtendiMax by Monsanto, Engenia by BASF and FeXapan by DuPont. The restrictions don’t affect Dicamba formulations for small grains and corn.
The restrictions are in addition to new label language released by the Environmental Protection Agency in October that classified the three newer Dicamba formulations as restricted-use products. The federal label also prohibits the use of any tank mix partners not stated on the label.
“We applaud the work done by the EPA and the registrants to develop the new label, but believe that a one-size fits all approach does not adequately address some of the unique conditions we face in our state,” North Dakota Agriculture Commissioner Doug Goehring said. “To address this we developed additional use restrictions for these products to minimize off-target movement of product.”
North Dakota has a dry climate, which can significantly increase product evaporation and potential for off-target movement, Goehring added.
The state’s new labels will take a few weeks to complete. XtendiMax, Engenia, and FeXapan will not be available for purchase until the registration process is complete.
The state’s additional requirements are:
• No applications may be made after June 30 or after first bloom, (R1 growth phase) whichever comes first.
• No applications may be made if air temperature of the field at the time of application exceeds 85 degrees F, or if the forecasted National Weather Service high temperature for the day exceeds 85 degrees F.
• Applications may be made only from one hour after sunrise to one hour before sunset.
• Applicators must maintain a speed of 12 mph or less when applying products.
• Prior notification must be given to NDDA. Notifications must include the basic applicator contact information and certification type. The time, date and location of the application must also be included.
• Any applicator working under the supervision of a certified private applicator must complete the Dicamba-specific training course before they may apply the product.
• No applications may be made using 80-degree or less spray nozzles.
Farmers should also strongly consider using pre-emergence weed management strategies, rather than relying solely on post-emergence applications of Dicamba or any other herbicide for weed control.
The additional restrictions don’t apply to generic Dicamba.
Dicamba is a selective herbicide used to control broadleaf weeds and woody plants. It has many applications, however, from lawn care to crop production and range management. In North Dakota, it has frequently been used for pre-plant applications for soybeans.