Weeds

Canola Watch provides timely answers to top canola agronomy questions on diseases, insects, weeds and so much more.
Featured image for “Dry conditions elevate herbicide carryover risk”
February 8, 2019

Dry conditions elevate herbicide carryover risk

Residual herbicides need a moist environment for herbicide breakdown to occur within the expected time-frame. In dry conditions, the two major breakdown methods –
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Featured image for “Spraying weeds after frost and snow”
October 11, 2018

Spraying weeds after frost and snow

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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Featured image for “Autumn, not winter, starts on September 22”
September 19, 2018

Autumn, not winter, starts on September 22

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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Featured image for “Give weeds time to re-grow before spraying”
September 12, 2018

Give weeds time to re-grow before spraying

Fall is a good time to control perennial and winter annual weeds, but spraying immediately after harvest may not provide the best results. Before
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Featured image for “Dry soils: Fall management considerations”
September 12, 2018

Dry soils: Fall management considerations

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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Featured image for “What is the best time for fall weed control?”
September 6, 2018

What is the best time for fall weed control?

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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Featured image for “Late-season weeds: Management options”
August 15, 2018

Late-season weeds: Management options

Some canola fields are looking weedier than expected for this time of year. If you see fields like this, think about the cause and,
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Featured image for “Pre-harvest products for use in canola”
August 1, 2018

Pre-harvest products for use in canola

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
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Featured image for “Watch for suspicious weed patches (kochia angle)”
June 27, 2018

Watch for suspicious weed patches (kochia angle)

With herbicide applications winding down, this is a good time to scan fields for suspicious weeds that escaped the management effort. The photo from
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Featured image for “Late herbicide: Is it worth it?”
June 27, 2018

Late herbicide: Is it worth it?

Too windy. Too wet. Sometimes both. This pushed back a lot of weed management and some fields are still not sprayed. In this situation,
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Featured image for “Unexpected herbicide damage: Scenarios”
June 20, 2018

Unexpected herbicide damage: Scenarios

Unexpected carryover can occur when dry conditions in the year of application slow the expected pace of breakdown of herbicides. Unexpected residue damage is
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Featured image for “Inversion and drift: Risk factors”
June 20, 2018

Inversion and drift: Risk factors

Low wind and clear skies can cause inversions, which can increase the risk of spray drift. This article explains how to identify (and avoid)
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