Home / Canola Watch / Insects / Page 37
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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…
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New research shows a statistically significant increase in crop damage by root maggots in continuous canola rotations. This increased damage coincided with reduced yields…
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Harvest is a good time to assess your canola results and prep fields for canola in 2012. If yields were disappointing given the large biomass of the crop, take time now to check for clues as to why…
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Bertha armyworm is at threshold levels in a few late fields in central Peace and western Saskatchewan regions. Lygus bug feeding continues in parts of Saskatchewan and around Dauphin, Manitoba…
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Don’t let your guard down just yet. Berthas have been at thresholds in east central Alberta and western Saskatchewan fields in the past week. Some fields probably should be sprayed, as long as they’re more than 7 days from swathing. Scout in the heat of day…
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Lygus populations continue to be high and exceed thresholds in parts of Alberta and Manitoba (around Morris and Altona). Once pods become leathery (role of thumb is about two weeks before swathing), then even adult lygus cannot cause damage and control is not economical. Economic control thresholds for lygus bugs are based on adult and late instar counts. When canola…
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Quite high populations of lygus are being found in parts of the Peace and southern and central Alberta (finding as many as 80 lygus per 10 sweeps with approximately 25 to 30% of those being adults with the remainder a range of instar stages). Sweep net results also seem to be variable…
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