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Aster leafhoppers were spotted in North Dakota, Manitoba and Saskatchewan in significant numbers this week. Leafhoppers can carry aster yellows phytoplasm, but the percentage of the population carrying it tends to be quite low. In extreme cases, growers could spray the leafhoppers, but there is no economic threshold for aster leafhoppers in canola, and trying to time an insecticide so…
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Rains can help to mellow soils that had crusted after a couple weeks of dry conditions, but the damage may have already been done. When scouting in fields with poor emergence, dig down and look for the plants — especially in fields known to be crust-prone…
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For canola fields at or below 4-5 plants per square foot, consider lowering the action thresholds for insect, weed and disease management all season long…
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Seeding progressed well this week but high winds dried out the seedbed and may have cut off or buried young seedlings or blown some seed out of the ground in……
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Many factors can cause a thin canola stand. Proper diagnosis is important for effective management. Here are common factors, with diagnosis tips for each. Many more photos are posted at the bottom of the article…
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It can take a few days after a frost before you can accurately answer that question. With a light frost of 0 C to -2 C, the risk of crop damage is minimal. With a heavy frost that kills off the cotyledons, it takes a few days before new leaves will start emerging from the growing point between the cotyledons…
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No time to wait? Growers who want to do a preseed burnoff and then get seeding may not want to wait 3-4 days for the weeds to recover from a frost. In this situation, growers should recognize that if they go ahead and spray right away, efficacy may be reduced. However, even with the lower efficacy, doing the burnoff and…
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Research and grower experience over the years have shown that uniform stands of 1-2 plants per square foot will often outyield or match the yield of a reseeded crop with a much denser stand…
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Check the field closely. How much of the field is lost? Some seeds may still be in the soil, and for seedlings sheared off, there may be some later emerging seeds that could fill in the stand and provide reasonable yield potential. Yield may not be ideal but the potential is perhaps better than a reseeded crop…
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