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Lygus hotspots: Lygus numbers are high in some regions, with reports of 70+ per 10 sweeps in some fields in central and northern Alberta. Some fields will warrant a spray, but seeing the plane next door does not mean all canola in the area should get sprayed. Assess each field. Bertha armyworm hotspots: Berthas are a very low numbers in…
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Pre-harvest interval (PHI) refers to the amount of time that must lapse (in days) after a pesticide application before the crop is cut. Cutting refers to swathing or straight combining. Each crop protection product has its own PHI, and the PHI for a specific product often vary by crop…
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While insects are not a major threat in most fields at this point in 2014, diamondback moth larvae are around, cabbage seedpod weevil are still laying eggs, and bertha armyworm larvae have been found in some locations — although at very low levels for the most part. (See the Map of the Week.) Here is a review of thresholds for…
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Beneficials. Lygus, bertha armyworm and diamondback moth have a number of natural enemies that will keep populations in check. These beneficial insects may not control an immediate pest threat that has already exceeded thresholds — growers will still have to spray in that case — but beneficials can keep a lid on populations. The key to preserving beneficial insects is…
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Here are best management practices to be friendly with bees and beekeepers…
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The Canola Council of Canada has produced four videos showing how beekeepers and canola growers can work together. Click the image above to see the video called "Canola and Bees: A sweet relationship."…
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Crop diagnostics often come down to good photography skills, especially since so many people have smart phones with cameras, and since agronomists cannot get to all fields in a timely manner. The rules to agronomy by phone and photograph are…
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Canola Watch Live! included a discussion on bees and other pollinators. Here are best management practices to reduce damage to these important insects: —Avoid spraying flowering canola. —Use economic thresholds when making control decisions. Remember: Threshold covers cost of application. No profit! —Use the least toxic option registered for the crop. —Take measures to minimize drift. Wind speed/direction, drift reducing…
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Many canola fields are within 5 to 10 days of swathing, which limits the choices for insecticides — based on pre-harvest intervals. Here are the pre-harvest intervals for insecticides registered for insect control in canola. Try the interactive PHI tool at www.spraytoswath.ca…
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