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Managing Roundup Ready Canola in Corn

Calvin Yoder (1), Akim Omokanye (2), Kim Schoorlemmer (3)

1 Alberta Agriculture and Forestry, Spirit River, AB

2. Peace Country Beef and Forage Association, Fairview, AB

3. DuPont Pioneer, Rycroft, AB

From: Peace Country Beef & Forage Association 2015 Annual Report


Corn acreage in the Peace River Region for livestock feed has steadily increased over the past number of years. Most of the corn seeded is Roundup Ready (RR) which provides a good system for controlling weeds. Volunteer RR canola is also a common weed on fields where corn is grown. Managing volunteer RR canola in RR corn requires a broadleaved herbicide that can be mixed with glyphosate and be safely applied prior to seeding corn or applied in-crop.

Selecting a corn herbicide should be based on weeds present, crop stage, crop tolerance and price. There are a number of broadleaved herbicides that can be tank mixed with glyphosate and used on corn as pre seed or in-crop applications. Tank mixing a broadleaved herbicide with glyphosate will improve control of a number of weeds including volunteer RR canola. Herbicides that can be tank mixed with glyphosate and applied prior to seeding corn are Heat, Pardner, Conquor, MCPA and 2,4-D. Some herbicides that are registered on corn and can be tank mixed with glyphosate include Pardner, Buctril M, 2,4-D, MCPA, Banvel and a new herbicide Armezon. Although Banvel, 2,4-D, MCPA are registered for use on corn agronomists prefer not to recommend them as they can cause stunted growth and poor brace root development resulting in lower yields. Bromoxynil which is the main active ingredient of Pardner and tends to be safer although can cause some leaf burn.