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.
This quick quiz has three images showing pretty distinct symptoms. What caused them?
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?
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…
How do you spray weeds in a timely fashion when every day seems too windy? Here are some tips….
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?
Autumn Barnes’ sentinel field near Enchant, Alberta, was dry last week. She took a few moisture probes to test the soil-moisture situation.
In-crop fertilizer applications can rescue a deficiency situation. But what nutrients are deficient? Look for these symptoms.
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.
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.
Canola coming events. Mark your calendar. Register. Learn.