Dicamba Resistant Soybeans

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

A number of fields were planted with Xtend soybeans, not necessarily with the intention of spraying dicamba, but some folks are reconsidering whether to spray. So here are a few reminders:

  • Only approved formulations of dicamba can be used and applicators need to have received training.
  • Be sure to read the label (at least twice because it can be confusing).
  • Applications must be made before 45 days after planting or before R1, whichever occurs first.
  • The new formulations of dicamba were developed to reduce volatility, but the issue of volatility has not been eliminated. We know high temperatures can increase the likelihood of these products to volatilize. We saw volatility with these products when they were applied to wheat stubble and air temperatures were 95°F.

When considering a dicamba application please use common sense. Do not only consider “can I spray it” but also give serious thought to “should I spray it”.