Pennsylvania Soybeans: Which Dicamba, 2,4-D Products Can Be Sprayed Burndown?

Highboy spraying pre-emerge or burndown herbicide. ©Debra L Ferguson Stock Photography

Highboy spraying pre-emerge or burndown herbicide. ©Debra L Ferguson Stock Photography

We have received questions about the use of certain dicamba products (Clarity, Banvel, etc.) regarding preplant applications prior to planting Roundup Ready 2 Xtend soybeans and 2,4-D product use in Enlist E3 soybeans.

In short, they were asking if Banvel, 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 generic 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, Xtendimax with Vapor Grip Technology and Tavium plus Vapor Grip Technology. Similar regulations hold true for the use of 2,4-D products in Enlist E3 soybean.

Enlist E3 soybean varieties can be planted immediately after an application of Enlist One or Enlist Duo (choline salt) in a burndown program. Any other 2,4-D product (LV4 ester, amine, etc.) must adhere to the 7-15 day wait period before planting depending on use rate.

Once the E3 soybeans emerge only Enlist One or Duo can be applied as an in-crop application, no other 2,4-D products can be sprayed over-the-top and would be in violation of the Technology Use Agreement.

In either the Xtend or E3 system, certain herbicides, adjuvants, and other pesticides can be tank-mixed with the core auxin herbicide, however, you must first check the specific websites to be sure what combinations are allowed.

Also, before any application can be made all the guidelines must be followed, especially to reduce off-target spray drift to other crops is a significant concern. 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, FeXapan, and Tavium can change periodically as new information is acquired.

Refer to their labels and websites for additional information and updates online by Bayer for Xtendimax, by BASF for Engenia, Corteva for FeXapan, and Syngenta for Tavium. Application information for the Enlist E3 soybean system can be found online.

Finally, Enlist E3 and Xtend soybeans are not cross tolerant to the auxin herbicides. If you apply 2,4-D post to Xtend soybean it will severely injure or kill them, this same is true if you spray dicamba on E3 soybeans.

Currently, Xtend soybeans are tolerant to dicamba and glyphosate and E3 are tolerant to 2,4-D choline, glyphosate, and glufosinate (Liberty). Other conventional soybean herbicides can be used in either system.

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