Over the past couple weeks we have received calls inquiring about the use of certain dicamba products (Clarity, Banvel, etc.) with regard to preplant applications prior to planting Roundup Ready 2 Xtend soybeans. In short, they were asking if Clarity, for example, can be sprayed in the burndown mixture and then immediately plant Xtend soybeans. The answer is no.
Whether it is Clarity, Banvel, or most other post patent dicamba-containing products the label states that at least 28 days plus 1 inch of rainfall/irrigation is necessary before any kind of soybean is planted if 1 pint of product is applied. (The labels of the specific products may vary slightly but essentially state similar information.) Since Xtend soybeans are not specified on their labels this longer wait period must be applied.
Currently, the only dicamba products that can be legally applied near planting or over-the-top in Xtend soybeans are Enginia, FeXapan plus Vapor Grip Technology, and Xtendimax with Vapor Grip Technology. Also, before any application can be made all of the guidelines must be followed especially to reduce off-target spray drift to other crops is a significant concern. In order to reduce drift and the other negative impacts to non-target areas, these labels and associated websites list what herbicides can be tank-mixed with these products. Other guidelines include prescribed nozzle types, boom heights, sprayer speed and wind speed limits. Also, depending on the landscape setting, field buffers must be included if susceptible crops are present and downwind at the time of application. Guidelines for using Xtendimax, Engenia and FeXapan can change periodically as new information is acquired. Refer to their labels and websites for additional information and updates online by Monsanto, by BASF, and by DuPont.
Professor of Weed Science