Don’t wait until flowering to control the volunteer Roundup Ready canola in soybeans, at this point, yield losses have already been incurred and you are only revenge spraying. Control of the volunteer canola should be done early in the season when the plants are small. Below you will see a chart outlining the products registered for use in soybeans to control volunteer canola post emergent. One change from last year is that you can now tank mix Viper ADV with Glyphosate. With any of these products always READ and FOLLOW LABEL DIRECTIONS. With any weed control program growers should also scout their fields before and after spraying to access level of control of problem weeds and determine the cause of any uncontrolled weeds.
Source : ManitobaPulse