You need to be aware of what you’ve seeded in the past to manage canola volunteers. Depending on the past canola system used, volunteers can come up with traits, including glyphosate tolerance, that you need to plan for when choosing a control option.
It’s common to see several dozen volunteers per square foot emerge during the first flush. And while that may not seem like a huge amount, they can be plentiful enough to create weed competition headaches with this year’s wheat or glyphosate tolerant soybeans.
That’s why it’s important to use a chemistry combination that’s going to give you effective control at pre-seeding and in crop.
Herbicide groups 4, 6 and 27 are known to be excellent choices. In general, anything with a dose of 2,4-D and a second mode of action is going to give you good volunteer canola control.
Group 14 herbicides are another good option. Some can be applied pre-seed, while others can be used in glyphosate tolerant soybean crops in certain labelled geographies.
If you’re using a Group 6 to give yourself a good burn down, wait until you see two true leaves on the canola. Spray too early and you’ll only burn off the cotyledon and not the plant’s growing points.
This agronomic tip from the field was provided by Sterling Mitchell, agronomic service representative with Syngenta Canada.