August 17, 2011 Issue 20

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  • Issues of the week

    Lygus populations continue to be high and exceed thresholds in parts of Alberta and Manitoba. Many young nymphs are being found and crops are nearing the end of the susceptible stage so management decisions are being made on a field-by-field basis. Pay attention to pre-harvest intervals (time between application and cutting) this late in the growing season. Once a crop is within 7 days of being swathed, no insecticides can be applied.

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  • Crop and weather update

    Peace: Crop is progressing nicely. Rainfall for the week ranged from a couple of tenths to an inch in the east. Crops continue to deteriorate (rotting) in the west. Swathing is about three weeks to a month away.

    Alberta: Warm weather over the past week

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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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  • 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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  • Effect of cooler temperatures on canola

    Cooler overnight temperatures (in the neighborhood) of 1 to 2 C occurred overnight Monday into Tuesday in parts of Alberta. These cooler temperatures will not affect canola crops significantly. Growth chamber research shows that seed enzyme effects could be impeded with temperatures at 1 C which resulted in higher green seed.

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  • How long from 30 to 50% seed colour change

    Seed colour change is an indication of moisture dry down. The following is an estimate of canola seed dry down rates during ripening based on research of weather conditions during mid-August to early September in different areas across the Prairies.

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  • What if frost does happen?

    As crops near maturity, the risk of frost is watched closely especially this year with late crops and late stages within fields. If a grower wants to cut a relatively late crop to avoid frost damage, consider the following:

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  • Disease Update

    Relatively low levels of sclerotinia infection can be found in most areas except in heavy and late maturing crops in northwest Saskatchewan where disease pressure is high due to frequent rains through the flowering period. Higher amounts of alternaria are occurring in B. juncea and B. rapa in western Saskatchewan and in B. napus fields in eastern Manitoba. In eastern Manitoba, more blackleg is appearing.

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  • Keep malathion out of canola bins

    Malathion CANNOT be used to treat bins where canola will be stored or to treat canola as it goes in to storage. These applications can result in residues in the canola that are unacceptable in some of Canada’s key export countries with low minimum residue limits (MRLs) or zero tolerance for malathion.

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  • Tips to time swathing

    Swathing is about to become general in Manitoba and proper timing is tricky in parts of Saskatchewan and Alberta because of variable staging. The following are some tips to help determine optimal time to swath:  Hail damage causing crops to mature unevenly. When swathing a hailed crop, assess the seed-colour change at the highest-producing parts […]

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