In-crop

  • Test kochia escapes for glyphosate resistance

    In-crop

    Farmers will want to test escapes for glyphosate resistance so the weeds can be targeted for intense management before they start to shed their seeds.

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  • Reader question: Late weed applications on stagey canola

    In-crop

    I have a field that is fairly dirty with kochia, cleavers and lamb’s-quarters. Half of the field is in 6-leaf and half is staring to bud. How much yield will I lose by spraying 0.5l of glyphosate on it?

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  • Suspicious weed patches? Check for resistance

    In-crop

    Important clues that a patch of weeds are herbicide resistant: One, the patch has no clear boundary. Two, the patch will be one species of weed that escaped the spray.

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  • Second-pass herbicide: Why and when?

    In-crop

    A second in-crop spray only makes sense if weeds are plentiful, at the same stage or ahead of the crop and the canopy hasn’t closed. These weeds may have a large yield impact. This could be a common situation when dry conditions have hampered crop growth.

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  • Canola Watch quiz – Herbicide-resistant weeds

    In-crop

    Six questions about herbicide resistant weeds – causes and management

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  • Dry conditions. Should I spray weeds?

    In-crop

    If weeds are present, then yes, you should spray. In some ways, dry conditions should do more to encourage early spraying because you don’t want weeds taking up what moisture is there.

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  • Weed BMPs: Spray early

    In-crop

    We know that weed competition can greatly reduce canola yield. A combination of pre-seed weed control and one in-crop application before the 4-leaf stage of the crop is often enough to eliminate yield loss from weed competition.

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  • Control big weeds early

    In-crop

    Flixweed, shown above, presents another possible risk – as a clubroot host. This adds to the incentive to spray it early.

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  • Weed spraying in challenging conditions

    In-crop

    Most products are not strongly affected by dust, but glyphosate is an exception. What about wind? Or cold?

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  • Watch for suspicious weed patches (kochia angle)

    In-crop

    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?

    In-crop

    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?

    In-crop

    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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  • Spray early: Economics of early weed control

    In-crop

    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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  • In-crop herbicide timing – scenarios

    In-crop

    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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  • Second herbicide application: A scenario

    In-crop

    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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