Canola blackleg spore shower risk forecast for Western Australia – 10 June 2020

Page last updated: Thursday, 11 June 2020 - 1:56pm

Please note: This content may be out of date and is currently under review.

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 8th June 2020) from the nearest weather station. Projections are based on an assumption of four millimeters (mm) of rainfall per week from now on.

Canola blackleg spore maturity forecast for Western Australia – 10 June 2020

Canola Blackleg Spore maturity map
Map showing predicted dates of canola blackleg spore maturity (dates) and the relative current risk of spores coinciding seedling stage based upon Blackleg Sporacle Model outputs for various locations in Western Australia (10th June 2020).

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

12 June

19 June

26 June

Blackleg risk

Low

Medium

High

Bolgart

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

Corrigin

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Darkan

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Eradu

Forecast for crops sown on

12 June

19 June

26 June

Blackspot risk

Medium

High

High

Esperance Downs Research Station

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Gibson

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Jerramungup

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Katanning

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Kendenup PO

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Kojonup

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Kojaneerup

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Kulin Post Office

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Lake Grace

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Lake King

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Merredin

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

Mingenew

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

Moora

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

Mount Barker

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Mullewa

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Low

Medium

Medium

Munglinup

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Narrogin

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Northam

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

Northampton

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

Medium

High

Salmon Gums

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Scaddan

Forecast for crops sown on

12 Jun

19 Jun

26 Jun

Blackleg risk

High

High

High

Tammin

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

Medium

High

Three Springs

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Low

Medium

Medium

Wagin

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Williams

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

High

High

High

Wongan Hills

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

York

Forecast for crops sown on

12 June

19 June

26 June

Blackleg risk

Medium

High

High

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).

Canola blackleg spore maturity forecast for Western Australia – 3 June 2020 (accessible table)

This prediction is based on the weather data (January to 8 June 2020) from the nearest weather station and assumes four millimeters (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 (10th June 2020).
Location

Projected maturity date for spores

Current maturity stage (colour of circle)

Badgingarra 12 July Pink

Bolgart

29 June

Red

Corrigin

19 June

Red

Darkan

15 June

Red

Eradu

7 July

Pink

Esperance

2 June

Red

Gibson

25 April

Red

Jerramungup

12 May

Red

Katanning

17 June

Red

Kendenup PO

28 May

Red

Kojonup

29 May

Red

Kojaneerup

24 April

Red

Kulin

8 June

Red

Lake Grace

18 June

Red

Lake King

4 June

Red

Merredin

7 July

Pink

Mingenew

6 July

Pink

Moora

5 July

Pink

Mount Barker

18 March

Red

Mullewa

12 July

Pink

Munglinup

23 April

Red

Narrogin

17 June

Red

Northam

1 July

Red

Northampton

7 July

Pink

Salmon Gums

25 April

Red

Scaddan

25 May

Red

Tammin

10 July

Pink

Three Springs

13 July

Pink

Wagin

22 June

Red

Williams

22 June

Red

Wongan Hills

2 July

Red

York

3 July

Red

Contact information

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