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Insects

The following articles are categorized as 'Insects'

• 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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• 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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• Cabbage seedpod weevil

  Numbers of adults in southern Alberta range between 3 to 4 per sweep but the majority of fields are completely out of flower. Spraying this late in the season is not economical because

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• Imported Cabbageworm some larva, lots of adults

  Cabbageworm larva populations are quite heavy in the central corridor on the western side of Saskatchewan and unprecedented amounts of adults can be found

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• Grasshoppers migrating to canola

  Parts of the Peace are seeing grasshoppers migrate from other crops into field edges

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• Tips to control multiple insect species at once

  Economic spray thresholds are calculated based on individual species. We don’t have scientific evidence to combine thresholds, but where an “additive” effect of multiple species can make sense is when more than one species are feeding on key yield-producing areas — flowers, buds and pods — at the same time. For example, if you have lygus bug and cabbage seedpod weevil in the same field and if they are both at 50% to 60% of their economic spray thresholds, spraying may provide an economic benefit.

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• How to sweep net properly

  Thresholds for lygus bugs and cabbage seedpod weevil, for example, are based on a specific sweep net technique. If you’re not doing a complete 180° pattern, walking while you sweep, and keeping the net near the top of the canopy, your counts could be significantly different from someone using the recommended techniques.

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