Question: I had some volunteer soybeans in my corn this year that I think affected my yield outcome. Next spring I plan to take a wait-and-see approach to address them if the problem shows up again. Got any recommendations?
Answer: If volunteer soybean shows up in your corn next season, consider these postemergence control measures, outlined by Darrell Deneke, South Dakota State University (SDSU) Extension IPM coordinator. He says soybean size at the time of herbicide application will determine the degree of control you get. As is true for most all weeds, smaller volunteer soybeans are easier to control than larger ones. Try to get on top of any problem before volunteer soybeans exceed the V3 growth stage. Using 2,4-D to control volunteer soybeans is one option, he says, though SDSU research shows that soybeans are not as sensitive to 2,4-D as they are to other plant-growth regulator herbicides, such as dicamba or clopyralid. The plant-growth regulator herbicides, such as Hornet, contain clopyralid and should provide effective control to smaller soybeans. He adds that products that contain dicamba, such as Status, Distinct and numerous generics, will provide effective control over a wider range of volunteer soybean growth stages. As always, read all product labels for application directions and to insure the herbicide you plan to spray is labeled for use in your state.
Beans Gone Bad
Move over waterhemp, ragweed, lambsquarters and all your weedy friends. There’s a new rabble-rouser in cornfields this season: volunteer soybeans.