• Ideal timing for a fall herbicide application should depend on the weeds present in the field. Perennials, like Canada thistle (shown), are best controlled in September, especially when using glyphosate. October is the best time to control winter annuals such as narrow-leaved hawk’s beard, stork’s bill, sow thistle and cleavers…
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  • Dry soils will be difficult to penetrate, and tillage will destroy standing stubble and its snow-catching capability. We can’t predict winter weather, but this extra moisture may be valuable next spring. Turning the soil can also cause a heavy flush of weeds from long buried seeds that have lost their dormancy, and burial of weed seeds and shattered canola seed…
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  • Cold temperatures help trigger winter annuals, such as cleavers (shown), and perennials to start moving food reserves down into below ground tissues, so waiting until after the cooler weather can improve weed control. But make sure weeds are actively growing with new supple leaf area to target, and that the actual spray day is warm…
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