Canola fields in eastern Manitoba are showing signs of blackleg infection. The photos below show typical damage. There is no effective fungicide for canola at this growth stage (protective sprays had to be applied early in the season) but growers are encouraged to scout and assess the level of damage before they harvest the crop. This will help in blackleg management decisions for future years.
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Blackleg heavy in parts of Manitoba
Growers are encouraged to check maturing crop for blackleg infection. It’s too late for fungicide to provide any benefit, but checking now can help plan for next year. Try to figure out why blackleg is worse than usual. It could be tight rotation. It could be use of a less resistant variety. Take steps to…
Blackleg: Use fungicide only where blackleg is a known problem
Growers in areas where blackleg infection was known to cause yield loss last year may choose to apply fungicide early in the season. Here are factors that increase the blackleg risk. The more of these risk factors that apply, the greater the risk: —Tight canola rotation —Using the same variety in the rotation —Yield loss…
Some canola fields in eastern Manitoba and northern Saskatchewan are showing signs of blackleg infection. There is no effective fungicide for canola at this growth stage (protective sprays had to be applied early in the season) but growers are encouraged to scout and assess the level of damage before they harvest the crop.
Blackleg symptoms found on two-leaf canola
Blackleg lesions were reported this week on some canola fields, which is much earlier than first detection last year. Early blackleg infection — from the cotyledon to 3-4 leaf stages — leads to the greatest yield loss. If growers see blackleg lesions on cotyledons or leaves early in the season, this may indicate a greater…