Blackleg Management Guide

Marcroft Grains Pathology - GRDC

Type: Factsheet
Knowledge level: Advanced

Farm Table says:

This is a very useful guide to prevent and/or manage blackleg in your canola.   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

This resource was published in September 2017 by

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.

Blackleg can cause severe yield loss in your canola crop, but can be successfully managed.

The Blackleg Management Guide is used to determine the risk of blackleg and provides ways to reduce yield loss.

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
  • Monitor  your canola crop to determine the current level of blackleg will be essential. If blackleg is causing yield loss in your crop you should work through the management options, in sequence, to reduce future losses.

In conclusion the guides suggests that:

    • you 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.

For the latest information and ratings

    • refer to the latest Blackleg management guide (updated in Spring and Autumn).
    • download the Blackleg Risk Management Worksheet and review your current management practices to see what you can change to reduce your disease risk.
2017 - Australia - Marcroft Grains Pathology - GRDC
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