Canola blackleg risk management for the districts of Western Australia
The following table shows (districts of Western Australia listed in an alphabetical order) risk of blackleg spore showers coinciding with the seedling susceptible stage relative to the sowing date.
Badgingarra
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Low |
Bolgart
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | Medium | Medium |
Corrigin
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | High | High |
Darkan
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Eradu
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackspot risk | Low | Low | Medium |
Esperance Downs Research Station
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Gibson
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Jerramungup
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Katanning
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Kendenup PO
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Kojonup
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Kojaneerup
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Kulin Post Office
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Lake Grace
Forecast for crops sown on | 29 May | 5 June | 12 June |
Blackleg risk | Medium | High | High |
Lake King
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Merredin
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Low |
Mingenew
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Medium | Medium |
Moora
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | Medium | Medium |
Mount Barker
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Mullewa
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Low |
Munglinup
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Narrogin
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | High | High |
Northam
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Medium | Medium |
Northampton
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Medium |
Salmon Gums
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Scaddan
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | High | High | High |
Tammin
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Low |
Three Springs
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Low | Low |
Wagin
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | Medium | High |
Williams
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Medium | High | High |
Wongan Hills
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Medium | Medium |
York
| Forecast for crops sown on | 29 May | 5 June | 12 June |
| Blackleg risk | Low | Medium | Medium |
Key to blackleg risk management for your district
| Blackleg spore shower risk | Suggestions |
| Low | Consider applying seed dressing if varieties below MR-MS are sown. |
| Medium | Consider applying recommended fungicide if varieties below MR are sown. |
| High | Consider applying recommended fungicide if varieties below MR-R are sown. |
In high disease pressure situations seed dressing alone may not be sufficient in providing adequate protection from disease. In this scenario consider applying additional protection either using fertiliser based fungicide or foliar fungicide application. Consider applying foliar fungicide if none of the upfront (seed or fertiliser based) fungicide is applied.
More information
For more information refer to Blackleg Management Guide, 2020 Autumn variety ratings produced by Grains Research and Development Corporation (GRDC).
