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Continued cool conditions have resulted in many acres being seeded without a pre-seed burnoff application. In these fields, weed control may be achieved post-seeding but prior to emergence. Post-seeding herbicide applications can be effective when well managed. Weeds should be assessed post-seeding for mechanical damage and dust cover. Herbicide application must occur before the crop emerges for some herbicide systems – the window is limited so scout diligently and watch the weather.
For more information on registered herbicide options for pre-seed or pre-emergent weed control in canola see the following links:
http://www.agric.gov.ab.ca/app23/herbsel
http://www.gov.mb.ca/agriculture/crops/cropproduction/gaa01d01.html
http://www.agriculture.gov.sk.ca/Guide_to_Crop_Protection
More information on pre-seeding weed control is available from Reduced Tillage Linkages: http://reducedtillage.ca/article63.aspx