Weeds

  • Canola Watch quiz – Spraying

    Weeds

    A quick quiz to test spraying windows, inversions and timing.

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  • In-crop herbicide timing – scenarios

    Weeds

    In general, early weed control is best. A few early weeds emerging before or at the same time as canola plants are much more damaging to yield than lots of weeds emerging after canola plants are established. Those early-emerging weeds tie up nutrients and moisture valuable to the crop and can also out-compete the crop […]

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  • Tank mixes of herbicides and insecticides or fungicides

    Weeds

    Sprayer in canola Cheri Jacobsen small

    Combining pest control operations to save trips over the field may seem like good economic sense, but consider the following when making this decision:

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  • Top 10 weed spraying topics

    Weeds

    We dug into our vast vault of Canola Watch articles to put together this Top 10 list.

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  • Tips for spraying weeds in dusty conditions

    Weeds

    Dusty conditions are common in spraying, and in dry springs they are often associated with a further challenge – drought-stressed plants. There is no magic cure for these problems, but Tom Wolf provides these guidelines….

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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? Too windy, according to the Guide to Crop Protection, can be product specific but is generally above 15 km/h. Here are tips to improve performance and limit the drift risk in wind….

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  • Map of the Week – Herbicide carryover risk

    Weeds

    The map shows herbicide carryover risk in Saskatchewan based on summer 2017 precipitation. In-season moisture from last season is the measure that influences herbicide breakdown.

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  • Weed competition is costly

    Weeds

    Weeds that emerge before the crop can be highly damaging to crop yield potential because they out-compete the crop for moisture, nutrients and sunlight. When the crop emerges, all early weeds need to be dead.

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  • Weed considerations for early May

    Weeds

    For best results, spray winter annuals when they’re small. They’ll be growing fast this week.

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  • 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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