Weeds

  • Maps: The moisture situation (with herbicide carryover theme)

    Weeds

    We haven’t lost a crop in March, but growers across large parts of Western Canada are concerned about the soil moisture situation. This may influence decisions on seed costs, fertilizer rates and, when the time comes, seeding depth. Dry conditions that started last summer can also increase the risk of herbicide carryover.

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  • Tank mix options for pre-seed burnoff

    Weeds

    Tank mixing is an important step in preventing herbicide resistance in weeds, and the pre-seed window is a good opportunity to use a tank mix rather than just straight glyphosate. Tank mix options for glyphosate ahead of canola are:

    –bromoxynil
    –Aim/CleanStart (carfentrazone)
    –clomazone
    –Conquer (bromoxynil and carfentrazone)

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  • Why add a tank mix to pre-seed glyphosate?

    Weeds

    Of all the glyphosate applied in the pre-seed window in Western Canada in 2017, 73% was applied alone. Only 27% was tank mixed. That’s according to data Monsanto presented at meetings this winter. Tank mixing multiple modes of action is generally considered one of the best ways to avoid herbicide-resistance, so we want to see that tank-mixing number grow.

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  • Fall herbicide: Frost, volunteer canola, cleavers and more

    Weeds

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  • Weeds: Late September, early October for perennials

    Weeds

    Perennials such as thistles and dandelions are best controlled from mid-September to early October. Waiting at least a month after cutting will increase the target leaf area, but later dates increase the risk of losing healthy leaf tissue to frost. Without healthy leaf tissue, the herbicide can’t get translocation to the weed’s crown and storage roots where the killing can occur.

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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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  • Second herbicide application: A scenario

    Weeds

    A Canola Watch reader sent us this question: I have wild buckwheat at the 3- to 4-leaf stage that somehow got missed with the first application of Liberty 10 days ago . It’s moderate in severity. Will it cause me grief at swath timing? And or will it have any effect on yield? Crop stage is 6-leaf or so.

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  • Late herbicide: Is it worth it?

    Weeds

    Wind and wet 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 herbicide application necessary?

    Weeds

    A second in-crop spray only makes sense if…

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  • Herbicide Qs on tank mixing, ideal weather, spray patterns and more

    Weeds

    Here are some agronomy-related questions that dig a little deeper into herbicide performance in canola….

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