Home / Canola Watch / Insects / Page 28
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Growers face many weed, insect and disease management decisions throughout a growing season. In many cases, these applications provide a clear return on investment. In other cases, they do not. Here are a few examples where applications have a very low chance of providing a return…
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While checking your seeding depth, take a look for cutworms at the same time. Another good time to look is around bare patches that show up after emergence. Cutworms could be the cause. Entomologists from across the Prairies are conducting cutworms surveys and are looking for help digging them up…
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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! had two key agronomy messages with regard to bertha armyworm management in 2014: 1. Lower canola prices will mean higher thresholds for bertha armyworm. Click "read more" to see the table. 2. Bertha armyworm populations tend to build for three years, then drop due to disease or beneficial insects. Areas that have had three years of building…
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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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Growers are still seeing some insects in their canola crops, including a higher than normal presence of flea beetles. Answers to the following three questions may help with management decisions…
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Bertha armyworm got its name because the worms will march like an army in search of food. As canola crops dry down and are swathed, bertha armyworms that have not pupated will keep moving in search of lush green plant material. Late canola fields could be in the crosshairs of this army…
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Flea beetle numbers this late in the season are higher than we’ve seen in years, which could point to higher numbers next spring. For this year’s canola crops, don’t take any action unless you see flea beetles feeding on pods over a broad number of acres. Entomologists have not set thresholds for late season flea beetle feeding, but it’s generally…
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Bertha armyworms keep eating to within a few days of pupating. These 1.5” late-stage berthas eat much more than at smaller stages, doing a lot of damage in a week if numbers are at thresholds…