June 13, 2018 – Issue 11

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  • Map of the Week – Bertha armyworm

    Growing degree days across most of the Prairies have reached the threshold for adult bertha armyworm (moth) emergence from overwintering pupae. That is 7-10 days ahead of normal. Egg laying begins shortly after adult emergence and young worms emerge about a week after that. Based on 2017 results, 2018 is not expected to be a bad year, but local flare-ups can occur.

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  • Canola Watch quiz – Symptoms and causes

    This quick quiz has three images showing pretty distinct symptoms. What caused them?

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  • Will this plant live?

    A field has a large number of young canola plants that look limp, pale, chewed-up, knocked around, lifeless and sad. How can you tell if a dead-looking plant still has life? Look at the growing point. Is it green?

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  • Herbicide carryover, sprayer contamination or something else entirely?

    Injury from herbicide residue in the soil can only occur in fields with a history of Group 2, 4, 5 and 14 herbicide applications. While soil characteristics and dry conditions can extend the at-risk period for these herbicides, carryover issues often occur when required recropping intervals are not followed. For example, Roundup Ready or Liberty Link canola cannot be seeded on fields that had Group 2 imazethapyr (Pursuit, Odyssey) the previous season. Here are typical symptoms for canola damaged by herbicide residue from these 4 groups…

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  • Tips for spraying in the wind

    How do you spray weeds in a timely fashion when every day seems too windy? Here are some tips….

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  • Good time for one final plant count

    Do a final plant count for the spring at the 4- to 5-leaf stage when most of the early-season threats have subsided. This will be your final report card on canola stand establishment. What factors influenced the stand? Was the seeding rate enough to meet the target stand?

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  • Sentinel story: How to use a moisture probe

    Autumn Barnes’ sentinel field near Enchant, Alberta, was dry last week. She took a few moisture probes to test the soil-moisture situation.

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  • Top dress: How to identify nutrient deficiency

    In-crop fertilizer applications can rescue a deficiency situation. But what nutrients are deficient? Look for these symptoms.

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  • ICW: Gather with the world’s brightest clubroot brains

    The International Clubroot Workshop, a gathering of clubroot researchers, is August 7-9 in Edmonton. Extension specialists, municipal staff, canola growers and anyone else interested in clubroot management are welcome to attend.

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  • Canola usually recovers from early-season hail

    Hail on canola, June 21, 2015. Credit: Val Katerenchuk

    Early season hail rarely has an impact on canola yield potential. Hailed seedlings usually come back very well. Even when individual plants die, a whole canola crop is fairly resilient to early season hail when it comes to overall yield potential.

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