Insects

  • Patches of missing plants could be cutworms, drought or something else

    Insects

    Patches of missing plants will prompt farmers and agronomists to start scouting for cutworms. This scouting step is important because other factors, including dry seedbed conditions and others, can also cause patchy growth. You need to identify the cause so you make accurate action decisions.

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  • Insect update: Flea beetle scouting, cutworm vs wireworm, DBM monitoring

    Insects

    Cutworms or wireworms? Check bare patches, and especially the interface between healthy seedlings and dead patches, to confirm the reason for missing plants. It could be cutworms, wireworms, disease or something else entirely

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  • Make the right flea beetle spray decision: 8 steps

    Insects

    While only a small percentage of canola fields tend to require foliar insecticides to manage flea beetles in addition to seed treatment, all fields should be monitored to assess the potential threat. Begin monitoring right after emergence and through until at least the four-leaf stage.

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  • The scouting toolkit

    Insects

    Smart phones and mobility-enabled tablets could be the most valuable scouting tools. But what else should be in your canola scouting kit?

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  • In-crop insect surveys in 2019

    Insects

    Insect risk maps depend on lots of scouting and survey. Each year, entomologists from the Ministries of Agriculture and Agriculture and Agri-Food Canada (AAFC) Research Centres collaborate with extension agrologists, crop specialists and industry groups to conduct insect pest surveys in field crops throughout the Prairies.

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  • PPMN canola insect scouting chart

    Insects

    Insects to watch for before and during seeding and immediately after emergence are cutworms, flea beetles, leafhoppers and diamondback moth.

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  • Take part in crowd-sourced insect reporting

    Insects

    Think how on the ball we could be with insect management if everyone shared their scouting results? We could see hot spots flare up early in very localized areas, providing a highly valuable alert to farmers within and beside those areas. Provincial entomologists tracking insect outbreaks would welcome your input.

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  • Late-season insects and pre-harvest intervals

    Insects

    We had reports this week of bertha armyworm at higher numbers (maybe not at thresholds) in some very localized areas, lygus (it’s getting late), flea beetles (don’t spray them, it won’t help for next spring) and aphids (probably don’t spray them either). While doing a pre-harvest scouting for disease, take a look at the insect […]

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  • Canola Watch quiz – Worm ID

    Insects

    How are your worm ID skills? Take the quiz and try to identify the four worms – two familiar, two not so much.

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  • Lygus: Scouting, thresholds and timing

    Insects

    Scout lygus at late flowering and podding stages using a standard insect net of 38 cm (15″) diameter. Take ten 180° sweeps, and aim to sweep the flowers and pods while moving forward. Count the number of lygus in the net.

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  • Late-season flea beetles

    Insects

    Flea beetles feeding on canola leaves and pods are unlikely to cause an economic loss. Entomologists have not set thresholds for late season flea beetle feeding, but it’s generally believed that numbers have to be very high — perhaps 100 per plant — before economic losses occur. You may also note that flea beetles can be highly variable at this time of year, with high numbers on some plants and next to none on others.

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  • Three insects to look for on canola pods

    Insects

    The three most common pod munchers are bertha armyworm, diamondback moth larvae and lygus bugs. Hot spots can sometimes be isolated to specific fields, so check each field. Before spraying, make sure insects counts are at or above economic thresholds. Applications made when insect numbers are below thresholds will not provide a positive return on investment and can do unnecessary harm to the many beneficial insects that help keep pest insect populations low.

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  • Canola Watch quiz – Insect thresholds

    Insects

    Scout for bertha armyworm, lygus bugs and diamondback moth larvae on pods, but only spray if insects counts are at or above economic thresholds. Try this quiz to brush up on thresholds.

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  • Grasshopper: Thresholds and scouting tips

    Insects

    The nominal threshold for grasshoppers in canola is 8 to 12 per square metre. The challenge with the nominal threshold is counting the grasshoppers. As soon as you walk into an area, grasshoppers take off and do not cooperate with your attempts to count them. So entomologists have come up with more practical scouting techniques.

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  • Map of the Week – Bertha armyworm counts

    Insects

    A few hotspots with higher bertha armyworm moth counts are showing up in Alberta, Saskatchewan and Manitoba.

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