Insects
The following articles are categorized as 'Insects'
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Will we have any winterkill of insects?
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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Rotations for pest resistance management
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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Rotations for insect control
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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Planning for next year
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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Insect update
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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Insect update
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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Insect update
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 prices are $12 per bushel and application costs are $12 per acre, the threshold is
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Lygus – race between insect and crop development
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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Bertha Armyworm still spraying in some areas
Bertha armyworm can be found in most fields in the central Peace with about 25% of the fields exceeding threshold and requiring spraying (around Lacrete and Fort Vermillion). Spraying is also happening in pockets in eastern Saskatchewan (south of highway 16 and east of highway 11) and in northern areas around Delisle and North Battleford.
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Diamondback moth at threshold in some areas
Parts of the Swan River Valley were spraying for Bertha last week and now are contending with diamondback moth. Second generation larva and cocoons are being found in other areas (Arborg in Manitoba and parts of north and eastern Saskatchewan) and these populations continue to be monitored. The threshold for diamondback larvae is 200 per meter square at today’s canola price.
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If you have general questions about the Canola Watch Email Newsletter, direct them to Jay Whetter.
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If you have specific agronomic questions contact someone from our Canola Watch team.
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