June 3, 2015 – Issue 12

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  • June 3 Quiz — Flea beetles

    Fleabeetle_underleaf_BrunoSK_May272015_AmandaWuchner small

    Test your flea beetle management skills….


  • Lots of reseeding

    Canola recovers from heavy frost. Photo credit: Terry Betcher

    Widespread heavy frost on the weekend was the last straw for many canola fields that were already under stress from previous frosts, flea beetles, wind, dry conditions and in some cases excess moisture. Growers may choose to reseed as a last effort to save what has been a stressful May for some canola crops. However, canola can be surprisingly resilient — as shown in this photo from Terry Betcher of Swan River, Manitoba.


  • In-crop weed management after a frost

    Wait for signs that canola plants have started regrowing before spraying after a frost.

    Wait for signs that canola plants have started regrowing before spraying after a frost.


  • Cutworm damage usually patchy

    Cutworm scouting step 3: Identify insects found. This is a cutworm. The nominal threshold is 25-30% lost plants in a field or confined area.

    Cutworm scouting begins with a walk through the field looking for bare patches, chewing damage in foliage, or clipped plants. Cutworms and cutworm damage is one thing to look for while scouting this week.


  • Add insecticides to herbicides only when necessary

    Sprayer in canola Cheri Jacobsen small

    Combining pest control operations to save trips over the field may seem like good economic sense, but consider the following when making this decision….


  • Assess seeder performance

    This canola was seeded 2+ inches deep as a result of poor drill settings. Dry soil conditions made the situation worse.

    Did the seeding tool meet expectations this year? A moist soil bed and rain in the days after seeding can make any seeding job look passable. Problems are more obvious when the crop is under stress.


  • Keep It Clean: Two timely reminders

    (1) Many insecticides have limits on how many times a year they can be sprayed on a canola crop. (2) Check approvals for all products to be used on canola.


  • Five things you need to know about flea beetles

    Here are five important points to help with flea beetle scouting and management:

    1. Flea beetle damage can advance quickly.
    2. Flea beetles will keep eating on cool days.
    3. Spray can be effective on cool days, but not wet days.
    4. Stem feeding can be more damaging than leaf feeding.
    5. Seed treatments are less effective on striped flea beetles.


  • Late seeding? Tips to help canola mature faster

    Canola stands with fewer than 4 plants per square foot (40 per square metre) can take 4 to 6 more days to mature.

    This graph shows that a higher seeding rate that will ensure a stand of at least 60 plants per square metre (6 per square foot) will mature a lot earlier than a stand with 20-40 per square metre. A higher seeding rate is just one way to reduce the days to maturity for a late seeded canola field.


  • Management for a thin stand

    Step one with a thin stand is to determine the cause so it can be prevented next year. Step two is to scout closely and take extra care to protect those few plants from insect damage and weed competition.


Canola Watch