Dicamba Basics

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Field Trials Demonstrate Dicamba Efficacy

  • As demonstrated in the pictures below, glyphosate and dicamba in Roundup Ready 2 Xtend® soybeans provided excellent control of glyphosate resistant weeds, including giant ragweed, common ragweed and Canada fleabane, in collaborative trials between Monsanto Canada and the University of Guelph.
  • When managing glyphosate-resistant weeds, Monsanto Canada recommends adding an additional effective mode of action to dicamba.
  •  The addition of dicamba to Roundup agricultural herbicides enhances control of tough weeds such as velvetleaf, wild buckwheat, and smartweed, which can be hard to control due to spray timing, weed staging, and/or environmental conditions.

Field Trials Demonstrate Dicamba Efficacy

Dicamba Basics

Dicamba is a selective benzoic acid herbicide used to control a wide spectrum of broadleaf weeds. It has a broad application window and can be used as a burn-down, pre- and post-emergence residual herbicide. Dicamba is rapidly absorbed by plant leaves, stems, and roots, and works as an auxin agonist by mimicking naturally-occurring plant hormones (i.e., auxins) that regulate many plant processes, such as protein synthesis and cell growth. Dicamba can induce rapid abnormal cell growth and development in the stems, petioles, and leaves of sensitive plants. Dicamba can also limit transpiration and photosynthesis. This leads to irregular cell growth, leaf drop, and starvation, resulting in plant death.

One of the most widely used herbicides in corn crops, dicamba is registered for use in agriculture, as well as other applications such as turf, ornamental, and lawn/garden. It is used to control weeds in pastures, range land, and non-crop areas.

A variety of dicamba formulations have evolved over time, differing in their physical properties and type of salt used. Dimethylamine (DMA) salt and dicamba acid are two of the oldest salt types while diglycolamine (DGA) salt was introduced in the mid-1990s. Innovations in dicamba chemistries continue today.

Dicamba vs. 2,4-D

According to Monsanto Canada research observations and experience, dicamba’s tank mix compatibility with other products is better than 2,4-D. Dicamba and 2,4-D may have similar effects on weeds to which they are applied, but they greatly differ in several ways: (1) dicamba controls tough weeds better than 2,4-D, and it is more effective on problem weeds like Canada fleabane and wild buckwheat; (2) fewer weeds are reported resistant to dicamba than 2,4-D, and (3) dicamba has a longer residual effect in the soil than 2,4-D. Dicamba has potential for residual control up to 14 days.