May 25, 2011 – Issue 9

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  • Issues of the week

    Frost hit many areas of the Prairies on repeated nights over the past week. Emerged crop is at risk, especially delicate cotyledons. Wait 3 or 4 days, then look for regrowth before making any management decisions. Find time each day to scout for insects, weeds and other stand establishment issues. And for growers facing continued […]


  • Crop and weather update

    Peace (B.C. and Alberta): Canola seeding ranges from half to two thirds complete in the east, to 95% complete in the west. Most areas had some rain in the past week, except for the far north. Fairly regular showers are the reason for slower seeding progress in the east. Alberta: Seeding is progressing well. Some […]


  • After frost, give crops and weeds 3-4 days to recover

    It can take a few days for young canola plants to recover after a frost. Even if damage looks severe, give the crop a few days to see if it will recover before considering whether to reseed. Weeds also need to start growing again after a frost before a spray will provide strong efficacy.


  • Spray early in crop

    Early weed control is the most economical. It reduces weed competition for nutrients and moisture, and improves yield potential for canola. In-crop weed control should occur as early as possible. The following article provides application windows for Clearfield, Roundup Ready and Liberty Link matching herbicides.


  • Insect update

    Take a few extra minutes each day to scout emerged crop for insect damage. It could be a busy spring for flea beetles, and cutworm damage is already reported in parts of Alberta.


  • When is too late to seed canola?

    Growers wondering when is too late to seed canola should consider these 4 factors: maturity of the variety, average date of first fall frost, crop insurance deadlines, and profit potential of option crops.


  • Aerial seeding a last resort

    If growers have to seed by plane because the field is too wet for a broadcast floater, that means it’s probably also too wet for weed control, fertilizing and harrowing — each important to a profitable broadcast canola crop.


  • Top up nitrogen before 5-leaf stage

    If planning a top up fertilizer application, nitrogen must be available before the 5-leaf stage of the crop to provide the largest yield benefit.


  • Early blackleg infection causes yield loss

    Blackleg infection from the cotyledon to 3-4 leaf stages is what can cause yield loss. If growers see blackleg lesions on cotyledons or leaves early in the season, then a fungicide may be warranted to stop further infection and limit yield loss.


Canola Watch