Canola blackleg spore shower risk forecast for Western Australia - 4 April 2019

Page last updated: Monday, 8 April 2019 - 3:31pm

The map below shows the current predicted dates of spore maturation and consequently the predicted risk of matching spore release with the susceptible stage of the crop. Spore showers will commence soon after the spores are mature in the fruiting bodies. The current forecast is based on weather data (1st January to 2nd April 2019) from the nearest weather station. Projections are based on an assumption of four millimetres (mm) of rainfall per week from now on.

Canola blackleg spore maturity forecast for Western Australia – 4 April 2019

Map of Spore maturity Forecast for WA 4 April 2019
Map showing predicted dates of canola blackleg spore maturity (dates) and the relative current risk of spores coinciding with seedling stage (red: high, pink : high- moderate, black: moderate, blue: low and green: very low) based upon Blackleg Sporacle Model outputs for various locations in Western Australia (4 April 2019).

What does this map show?

  • Location specific spore maturity prediction date (that is, 21/4 means that spores are expected to be mature and to begin spreading from stubble to canola seedlings on 21 April, based on rainfall to date and anticipated rainfall of at least 4mm per week in the coming weeks at that location).
  • Different coloured circles indicate the current risk of blackleg (red: high, pink : high- moderate, black: moderate, blue: low and green: very low)

An accessible version of this table is available.

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

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Corrigan 

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Darkan 

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Medium

Medium

High

Eradu

Forecast for crops sown on

3 April

10 April

17 April

Blackspot risk

Low

Low

Low

Esperance Downs Research Station

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Jerramungup

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Medium

Medium

High

Katanning

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Medium

Medium

Medium

Kulin Post Office

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Lake Grace

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Lake King

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Merredin

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Mingenew

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Moora

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Mount Barker

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Medium

High

High

Mullewa

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Munglinup

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Medium

Medium

Narrogin

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Medium

Medium

Northam

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Northampton

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Salmon Gums

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Medium

Scaddan

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Medium

Medium

Tammin

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Three Springs

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

Williams

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Medium

Medium

Wongan Hills

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

York (Post Office)

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

Low

York (Talbot House)

Forecast for crops sown on

3 April

10 April

17 April

Blackleg risk

Low

Low

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, 2018 Spring variety ratings produced by Grains Research and Development Corporation (GRDC).

Canola blackleg spore maturity forecast for Western Australia – 4 April  2019 (accessible table)

This prediction is based on the weather data (January to 2 April 2019) from the nearest weather station and assumes four millimetres (mm) of rainfall per week from now on. The map shows the current predicted dates of spore maturation. Spore showers will start after the spores are mature. The maturity date can help growers to decide if and when foliar fungicide application is warranted depending on disease pressure (regional and paddock - specific) and varietal resistance.

Table 2. Predicted dates of canola blackleg spore maturity (dates) and current status of fungal fruiting body (colour of circle) based upon Blackleg Sporacle Model outputs for various locations in Western Australia (4 April 2019).

Location

Projected maturity date for spores

Current maturity stage (colour of circle)

Badgingarra

19-May

Green

Corrigin

17-May

Green

Darkan

28-Apr

Pink

Eradu

21-May

Green

Esperance

10-May

Black

Jerramungup

27-Apr

Pink

Katanning

2-May

Pink

Kulin Post Office

14-May

Blue

Lake Grace

12-May

Blue

Lake King

10-May

Black

Merredin

17-May

Green

Mingenew

21-May

Green

Moora

18-May

Green

Mount Barker

21-Apr

Red

Mullewa

21-May

Green

Munglinup

4-May

Pink

Narrogin

5-May

Pink

Northam

17-May

Green

Northampton

21-May

Green

Salmon Gums

14-May

Blue

Scaddan

6-May

Pink

Tammin

17-May

Green

Three Springs

21-May

Green

Williams

8-May

Black

Wongan Hills

18-May

Green

York (Post Office)

17-May

Green

 

Contact information

Mark Seymour
+61 (0)8 9083 1143
Art Diggle
+61 (0)8 9368 3563