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Spray Early in Crop


Spray Early in Crop

Early weed control is the most economical and often the most successful. It reduces weed competition for nutrients and moisture, improving the yield potential for canola. Younger weeds are also easier to control and that control may be achieved with lower rates. Later emerging weeds have less impact on yield than those emerging with or ahead of the crop. For these reasons, in-crop weed control should occur as early as possible.

A possible strategy to control early weeds to maximize yield while also catching later germinating seedlings is split applications. This is an option with glyphosate on Roundup Ready canola varieties and Liberty on Liberty Link varieties. The first application of the split is best timed just as the crop is emerging. The second application, if necessary, can go on before the maximum crop stages for each herbicide system and at the optimum stage for control of the emerged weeds.

Here are the staging options for each herbicide tolerance system:

Roundup Ready: The window is from seeding to the 6-leaf stage. Two applications are an option, but the maximum application rate per season is the equivalent of 1.0 litre per acre of the original 356/360 g/L formulation in RR canola.

Liberty Link: The window is from cotyledon to early bolting. Set the rate based on weed pressure. Split application is an option, but the maximum allowable rate per season is 2.97 litres per acre.

Clearfield: The window is from the 2-leaf to the 6-leaf stages. Odyssey, Odyssey DLX or Absolute can be applied only once per season (no split applications) but have some residual activity.

Scout fields to see what weeds are present and at what size and plant density before choosing an appropriate rate and/or tank mix option. For example, Canada thistle is 3 to 4 times more competitive than wild oats and may require a special approach for effective control. Research from AAFC in Lacombe, Alta., shows it only takes 10 Canada thistle shoots per square metre to cause a 10% yield loss in canola. For more on this, read the Canola Council of Canada factsheet, "How many weeds are too many?"

Consult with your company representative to determine the appropriate rates and tank mix combinations for your situation and weed population, or click your province for a link to your guide to crop protection: Alberta Saskatchewan Manitoba.

Source: Canola Council of Canada


Trending Video

Why Your Food Future Could be Trapped in a Seed Morgue

Video: Why Your Food Future Could be Trapped in a Seed Morgue

In a world of PowerPoint overload, Rex Bernardo stands out. No bullet points. No charts. No jargon. Just stories and photographs. At this year’s National Association for Plant Breeding conference on the Big Island of Hawaii, he stood before a room of peers — all experts in the science of seeds — and did something radical: he showed them images. He told them stories. And he asked them to remember not what they saw, but how they felt.

Bernardo, recipient of the 2025 Lifetime Achievement Award, has spent his career searching for the genetic treasures tucked inside what plant breeders call exotic germplasm — ancient, often wild genetic lines that hold secrets to resilience, taste, and traits we've forgotten to value.

But Bernardo didn’t always think this way.

“I worked in private industry for nearly a decade,” he recalls. “I remember one breeder saying, ‘We’re making new hybrids, but they’re basically the same genetics.’ That stuck with me. Where is the new diversity going to come from?”

For Bernardo, part of the answer lies in the world’s gene banks — vast vaults of seed samples collected from every corner of the globe. Yet, he says, many of these vaults have quietly become “seed morgues.” “Something goes in, but it never comes out,” he explains. “We need to start treating these collections like living investments, not museums of dead potential.”

That potential — and the barriers to unlocking it — are deeply personal for Bernardo. He’s wrestled with international policies that prevent access to valuable lines (like North Korean corn) and with the slow, painstaking science of transferring useful traits from wild relatives into elite lines that farmers can actually grow. Sometimes it works. Sometimes it doesn’t. But he’s convinced that success starts not in the lab, but in the way we communicate.

“The fact sheet model isn’t cutting it anymore,” he says. “We hand out a paper about a new variety and think that’s enough. But stories? Plants you can see and touch? That’s what stays with people.”

Bernardo practices what he preaches. At the University of Minnesota, he helped launch a student-led breeding program that’s working to adapt leafy African vegetables for the Twin Cities’ African diaspora. The goal? Culturally relevant crops that mature in Minnesota’s shorter growing season — and can be regrown year after year.

“That’s real impact,” he says. “Helping people grow food that’s meaningful to them, not just what's commercially viable.”

He’s also brewed plant breeding into something more relatable — literally. Coffee and beer have become unexpected tools in his mission to make science accessible. His undergraduate course on coffee, for instance, connects the dots between genetics, geography, and culture. “Everyone drinks coffee,” he says. “It’s a conversation starter. It’s a gateway into plant science.”