2017 Spring Variety Ratings, Blackleg Management Guide
Blackleg can cause severe yield loss, but can be successfully managed. Use this guide to determine whether you are in a high-risk situation and what practices you can change to reduce or prevent yield loss from blackleg. Follow the four steps, in sequence, from this management guide.
- Never sow your canola crop into last year’s canola stubble.
- Monitor your crops in Spring to determine yield losses in the current crop.
- Choose a cultivar with adequate blackleg resistance for your region.
- Relying only on fungicides to control blackleg poses a high risk of fungicide resistance.
- If your monitoring has identified yield loss and you have grown the same cultivar for three years or more, choose a cultivar from a different resistance group.
Blackleg is a sexually reproducing pathogen that will overcome cultivar resistance genes. Fungal spores are released from canola stubble and spread extensively via wind and rain splash. The disease is more severe in areas of intensive canola production.