Pre-harvest weed control

August 19, 2015 - Issue 22

Growers considering a pre-harvest glyphosate cannot apply it to canola (RR or non-RR) until seed moisture drops to 30% or lower. This roughly coincides with 30% seed colour change. Spraying earlier raises the potential for glyphosate residue in seed. Pre-harvest glyphosate will kill green weeds and even out the non-RR canola for straight combining. Note: Glyphosate can take up to 3 weeks to do its job in cool conditions.

Group-14 Heat can now be used with glyphosate for pre-harvest weed control or crop drydown. It fits with any canola herbicide system, including glyphosate-tolerant varieties. The application timing is 60-75% seed colour change. The pre-harvest interval is three days.

More on pre-harvest Heat and glyphosate.

Canola Watch