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We answer questions on weed, harvest and fertilizer management. We also have links to help with canola hybrid selection for 2022…
Fall control
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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?… -
The snow layer is likely to insulate the weed leaf material from the colder conditions that follow it. That could mean you’re back spraying earlier than you would be with frost alone…
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The general advice is to leave them. As annuals, frost and winter will kill off most of them, and any money spent trying to control these volunteers would be wasted. Possible exceptions that may change your approach… -
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 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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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…
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Fall is a good time to control perennial and winter annual weeds, but spraying immediately after harvest may not provide the best results…
