June 4, 2014 – Issue 9

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  • Four the week

    Flea beetles crucifer small

    Flea circus. Flea beetles love warm weather and fresh young canola. When scouting, assess the whole crop, not just field margins, and spray if leaf loss exceeds 25% for most plants and feeding continues.

    Efficacy effort. Emerging canola is not highly competitive, yet. To get the most out of weed control, follow efficacy tips specific to products for each HT system.

    21 days of intimacy. Take regular walks in (or “with”, if you prefer) canola fields to see if the crop needs attention over these critical three weeks.

    “10, 10 plants per square foot, ah ah ah!” The Count from Sesame Street would love spring scouting. Plant counts and an assessment of the stand can tell you a lot about the seeding job.

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  • Map of the week

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    Here is a wind trajectory map showing continued arrival of south winds, these ones from southern California. Southwestern North America (Texas, Mexico and southern California) is a source area for diamondback moth larvae and aster leafhoppers.

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  • June 4 Quiz

    Wirestem long cropped small

    Three questions with visuals and tips that will augment your early season scouting, including “The cotyledon on the left is likely to die. Why?”

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  • Insect update: Flea beetles, cutworms

    Heavy damage to the first and second true leaves may warrant immediate action if the flea beetles are still present in high numbers. Source: Brian Hall

    Canola is advancing quickly, often emerging in 5 days and starting to sprout its first true leaf in just over a week. Flea beetles are also out in big numbers — enough to warrant a few walks through each field. Seed treatments will provide 3 to 4 weeks of protection for canola that emerges within a week of seeding. Flea beetles need to take a bite of the plant in order to take up the insecticide, so there will be some feeding even while the seed treatment is working. But scouting is still necessary for two reasons: (1) In some cases, intense nibbling by a very large flea beetle population could overwhelm the seed treatment. (2) Seed treatments may wear out in slow germinating or growing crops before the plants are large enough to tolerate much feeding. And (3), the two most common seed treatment insecticides may be a bit less effective on striped flea beetles, so check which one is most common in your field. Most areas of the Prairies have both striped and crucifer flea beetle species.

    Read more for tips how to make the flea beetle spray decision…

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  • Efficacy tips for each HT system

    Here are the label stages for in-crop herbicide applications, by HT system.

    Weeds are coming up strong. As part of the Canola Council of Canada’s Keep It Clean campaign, we remind growers to use only registered pesticides when required. Refer to product labels for proper use instructions.

    Here are strategies to improve weed control results for each HT system:

    —Liberty LInk: As a contact herbicide, Liberty is recommended to be applied as medium to slightly coarse droplets (approximately 200 – 350 microns) and typically needs water volumes of at least 10 gallons per acre to maintain efficacy. Warm weather also improves results. The application window for Liberty is from emergence to early bolting.
    —Roundup Ready: A combination of coarse spray and low (but not ultra low) water volume is best to make sure you get glyphosate droplets on even the smallest weeds. The glyphosate window on RR canola is from seeding to 6-leaf.
    —Clearfield: Group 2 products for the Clearfield system in general perform well with coarse sprays. The application window for Ares is the 2- to 7-leaf stage, and for other IMI herbicides is the 2- to 6-leaf stage.

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  • Tank mix rules from PMRA

    Have a clean sprayer tank and hoses before starting in-crop sprays in each canola field.

    Canada’s Pest Management Regulatory Agency (PMRA) permits “unlabelled” tank mixes as long as products in the mix are used under the following conditions:

    1. Each tank mix partner is registered for use in Canada on the crop of interest. Note that just because products have similar actives or are generics does not mean that they are registered for use on the same crops. Check labels closely.

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  • The critical first 21 days

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    The week after seeding is a good time to dig up seeds and seedlings to check for rots and blights. Disease damaged seed and seedlings die quickly, and may be gone within a few days, which is why this timing is important to an accurate diagnosis. While scouting for disease, also look for…

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  • How to count plants

    Start counting a week after seeding and repeat a couple of times over the following two weeks. Here’s how…

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  • Clubroot and mud

    A moist late spring means more mud clinging to equipment and, because growers are under extra pressure to get the crop seeded, less time available to clean equipment between fields. This greatly increases the risk of clubroot spreading from field to field. The following photos show high risk scenarios for clubroot spread…

    mud on highway clubroot
    Mud on packers

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