Weeds

  • Spraying weeds after frost and snow

    Weeds

    Spray decisions — when to spray or whether to spray at all — will depend on leaf condition after the snow is gone.

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  • Autumn, not winter, starts on September 22

    Weeds

    Despite some wintery weather, we can hope for (and expect) good harvest weeks to come. Don’t rush into pre-winter jobs just yet.

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  • Give weeds time to re-grow before spraying

    Weeds

    Fall is a good time to control perennial and winter annual weeds, but spraying immediately after harvest may not provide the best results. Before spraying, identify the weeds present. Are they perennials? Winter annuals? Annuals? Clubroot hosts?

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  • Dry soils: Fall management considerations

    Weeds

    Dry conditions throughout the summer and heading into winter could have ramifications for field management decisions this fall and rotation planning for next year.

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  • What is the best time for fall weed control?

    Weeds

    Fall is a good time to control perennial and winter annual weeds, but spraying immediately after harvest may not provide the best results.

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  • Late-season weeds: Management options

    Weeds

    Some canola fields are looking weedier than expected for this time of year. If you see fields like this, think about the cause and, if appropriate, consider a different approach next year.

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  • Pre-harvest products for use in canola

    Weeds

    What is the goal with a pre-harvest application? If weed control is the goal, assess the weed situation before spraying. If desiccation (crop and weed dry-down) is the goal for straight combining, this decision should wait until just before harvest. Here are the pre-harvest options for canola…

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  • Watch for suspicious weed patches (kochia angle)

    Weeds

    With herbicide applications winding down, this is a good time to scan fields for suspicious weeds that escaped the management effort. The photo from Tammy Jones shows glyphosate-resistant kochia.

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  • Late herbicide: Is it worth it?

    Weeds

    Too windy. Too wet. Sometimes both. This pushed back a lot of weed management and some fields are still not sprayed. In this situation, intense weed pressure can reduce yields by 20%, 30%, 50%… That’s why early weed control has a huge positive effect on profitability, but late control is better than nothing. Late control can stop the yield loss, stop weeds from contributing substantially to the weed seed bank, and improve crop harvestability.

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  • Is a second in-crop herbicide application necessary?

    Weeds

    A second application of in-crop herbicide is not always economical if the crop is well established, competitive and ahead of the remaining weed population. A second in-crop spray only makes sense if…

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  • Herbicide carryover, sprayer contamination or something else entirely?

    Weeds

    Injury from herbicide residue in the soil can only occur in fields with a history of Group 2, 4, 5 and 14 herbicide applications. While soil characteristics and dry conditions can extend the at-risk period for these herbicides, carryover issues often occur when required recropping intervals are not followed. For example, Roundup Ready or Liberty Link canola cannot be seeded on fields that had Group 2 imazethapyr (Pursuit, Odyssey) the previous season. Here are typical symptoms for canola damaged by herbicide residue from these 4 groups…

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  • Tips for spraying in the wind

    Weeds

    How do you spray weeds in a timely fashion when every day seems too windy? Here are some tips….

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  • Spray early: Economics of early weed control

    Weeds

    One of our Alberta agronomy specialists encountered the situation in the photo. Canola emergence was patchy in this small area, but generally good overall. The bigger issue was the big population of tiny weeds. The agronomy specialist wondered if these buckwheat seedlings, though very abundant, were too small to spray? The answer is no.

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  • Scouting 7 to 21 days after seeding: What to look for?

    Weeds

    With warm soils, decent moisture and 1” seeding depth, emergence can occur about a week after seeding. If emergence is slow or patchy, scout to find out why. The first 21 days are critical to a successful canola crop.

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  • What causes herbicide carryover damage?

    Weeds

    Factors that affect herbicide carryover are herbicide group, field history, soil characteristics, dry conditions and temperature.

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