Dicamba and soybeans: a controversial combo
Iowa corn and soybean growers have had a long history of working with the herbicide dicamba, the active ingredient that was originally sold as Banvel. In fact, dicamba was registered 42 years ago. During this time, corn growers have frequently used dicamba products to effectively manage many broadleaf weeds in corn with either preemergence or early postemergence applications. However, growers have also learned that soybeans are highly sensitive to dicamba. With the adoption of glyphosate-resistant corn hybrids and the availability of new corn herbicides, growers and applicators may be inclined to think that worries about dicamba are history. Nevertheless, situations arise each year where dicamba has caused damage to soybeans. Many growers are also aware of new herbicide-resistant traits that are under development, including dicamba-resistant soybeans. If dicamba is used in dicamba-resistant soybeans, growers and applicators should be prepared to use this technology in a manner to lessen the risk of off-target injury.