Weeds

  • Canola Watch quiz – Weed management

    Weeds

    Is your weeds management knowledge in 2019 mode? Give yourself a little test with these four questions.

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  • Tank mix options for pre-seed burnoff

    Weeds

    Tank mix options for glyphosate ahead of canola are bromoxynil, Aim/CleanStart (carfentrazone), clomazone, Conquer (bromoxynil and carfentrazone) and quinclorac. Tank mixing can prevent herbicide resistance.

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  • Herbicide-resistant weeds: prevention and management

    Weeds

    Here are tips to prevent the development and spread of glyphosate-resistant kochia (as shown in the map) and other herbicide-resistant weeds.

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  • Top 10 canola-related jobs for April

    Weeds

    1. Prep for good seed placement. 2. Use the canola calculator to set seeding rates. 3. Know the risk of seed-placed fertilizer…and more.

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  • 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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