Home / Canola Watch / Insects / Page 37
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If flea beetles are already out and on volunteers given the conditions we’ve had, as soon as it gets warm, they will be feeding more aggressively…
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When the warmer weather returns, as is forecast later this week, canola still in the seedling stage that was seeded over 3 weeks ago may be at high risk of flea beetle damage. Also, dig down to look at the seed. A soft mushy seed is dead — likely from disease — and will not emerge…
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Have you looked closely at your flea beetles lately? Striped flea beetles may not have been a problem in your area in the past, but populations are shifting. This is important because striped flea beetles start feeding earlier, and are more tolerant of seed treatments currently on the market…
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Striped flea beetles seem to be more common each year, especially in the northern canola growing regions. Research suggests that a population of striped flea beetles may do more feeding on seed-treated canola prior to control than a similar population of the crucifer type, so look closely when scouting…
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Growers cannot expect natural enemies to provide enough immediate control to reduce the pest threat to canola in that year. Growers will still have to spray if economic thresholds are reached. The key is to pay attention to thresholds and spray only when necessary. This will help maintain the natural enemy numbers…
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Our current economic threshold tables for lygus in canola may be too low when applied to current canola production systems across the Prairies. If the stand is healthy and growing fast, growers are reportedly doubling or tripling thresholds. There is no data to support this, but future research needs to reexamine the thresholds with respect to our newer varieties of…
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The key messages from this station: —Keep an open mind when scouting a field for problems. Symptoms can have many causes, and it can be a costly mistake to jump to conclusions before considering all possibilities. Many probable causes were discussed ranging from diseases to insects when describing sick or non emerging plants. —Environmental stresses like heat during bolting through…
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In general, overwintering mortality is not a major factor in reducing insect populations, but we know of a few important exceptions:…
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Lack of crop diversity can increase the density of pests in a field. The higher the population of a pest in a field, the higher the risk of developing resistance to the pesticides (herbicide, fungicides or insecticides) used for controlling the pest in those fields…