A common weed question recently is how to control volunteer canola in double crop soybean.  We do not have research on this “new” problem.  Fortunately, my colleague, Dr. Joe Ikley of North Dakota State University, has good information on what herbicides work best. His research indicates that auxin herbicides like 2,4-D are rated poor for control of volunteer canola.

Fomesafen (Prefix, Reflex, Flexstar, etc.) is rated as excellent on volunteer canola control. This provides growers with an option that is readily available, relatively inexpensive and can provide residual pigweed control.

Liberty is also rated very high on volunteer canola.  However, this will be incorrect if the volunteer canola is a Liberty Link variety.