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Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
Weekly Crop Update, March 20, 2026
University of Delaware Cooperative Extension
The EPA has approved special formulations of dicamba for use with dicamba-resistant soybeans (Xtend). These are not new formulations, Engenia, Tavium and Stryax. Stryax is a new name for Xtendimax. All of these are formulated for lower volatility, but none of them eliminated the volatility inherent with the
dicamba molecule.
The rates differ between the three products because they have different concentrations of dicamba. They all require a drift reduction agent and a volatility reduction agent with each application. All applicators need to complete dicamba-specific training, refer to the companies’ websites for the training.
Read the specific labels for application instructions and precautions. A few things to note:
- 240ft downwind buffer between application site and sensitive areas,
- apply when wind is between 3 and 10 mph,
- only two applications per season are allowed.
- do not apply with AMS.
- do not apply if forecasted temperatures are 95 degrees or above either on the day of the
- application or the following day.
- The last two years this occurred June 23, soybeans planted after mid-May will need a postemer gence spray after the third week of June. if temperatures are between 85 and 95 degrees, do not treat more than 50% of the growers’ dicamba resistant soybeans (see label)
- fields treated with dicamba must have three (3) mitigations points for ESA (Endangered Species Act) requirements.