August 8, 2013 – Issue 19

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  • Issues of the week

    Adult lygus bug on canola pod.

    Growers would like to see a stretch of warmer weather to advance the crop. Some fields are still flowering, and have been for six weeks.

    Bertha armyworms are starting to feed lower in the canopy. They will move up the plant as lower leaves drop. A lot of areas had adult counts that would suggest a moderate to high risk for bertha armyworms, and growers in all areas are encouraged to scout. Bertha armyworms can be kept in check by fungal and insect beneficial organisms, but populations do explode once in awhile, outpacing the beneficial activity. While scouting for bertha armyworm, take the sweep net and check lygus counts. (See lygus in the photo above.)

    Want to get some great first-hand insight into blackleg conditions across the Prairies? Sign up to take part in a 5-year research project. See details in the article below.

    Swathing could start this week for the earliest crops. The ideal swath time for yield and quality is 60% seed colour change on the main stem, but growers will have to make adjustments for uneven crops and for large plants that have a higher percentage of yield on side branches.

    Tweet of the week:

    Tweet of the week Aug8


  • Canola Watch quiz

    Quiz August 8

    If you have trouble seeing the embedded quiz on your device, click here.


  • Top 10 things to address before you swath

    swathing canola

    2. At what percent seed colour change (SCC) will you begin swathing? The ideal for yield and quality is 60% seed colour change, but growers with lots of canola to swath will probably have to cut some earlier — especially if late-seeded canola caught up to early-seeded canola and everything seems to be at the same stage.
    1. Assess the maturity of all the canola fields on your farm to determine which fields will be ready first. SCC advances by about 10 percentage points every 2 or 3 days.

    Read more for the other 8…


  • Bertha armyworms work their way up

    Bertha armyworm spraying has been reported in a few fields. Scout lower in the canopy this week, looking for feeding on lower leaves. Spotting them down low will give you a couple weeks’ planning time before leaf drop begins and berthas start moving up toward the pods — where they do their most costly damage. […]


  • A good way to learn more about blackleg

    Blackleg lesion starting at stem base. Source: Anastasia Kubinec

    A 5-year project to investigate changes in blackleg needs 20-25 growers per Prairie province to volunteer fields for the survey. This would be a great way for growers to learn more about blackleg management.


  • Clubroot lookalikes

    Hybridization nodules 2

    Some fields are already showing a lot of gall growth, probably because the wet spring promoted early infection. These galls are most likely clubroot, especially if the fields are in known clubroot hot zones. However, not ALL root galls are clubroot. Galls could also be hybridization nodules (shown above) or phenoxy damage.


  • Swathing a multi-staged crop

    The swath decision becomes more difficult in crops with plants at multiple stages of growth. For example, if some plants are at 60% seed colour change (SCC) on the main stem and other plants are still flowering, growers may want to hold off on swathing. Or if plants are large with many secondary stems, the main stem may be at 60% SCC, but seeds in side branches are still mushy and green. These seeds would wither up and amount to nothing if the crop is swathed at 60% SCC on the main stem. The decision requires an assessment of the field, and a look at the calendar….


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