Canola blackleg spore shower risk forecast for Western Australia – 22 May 2019

Canola blackleg spore maturity forecast for Western Australia – 22 May 2019

[1]

Map showing predicted dates of canola blackleg spore maturity (dates) and the relative current risk of spores coinciding 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 (22nd May 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 [2] 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

Corrigin

Darkan

Eradu

Esperance Downs Research Station

Jerramungup

Katanning

Kulin Post Office

Lake Grace

Lake King

Merredin

Mingenew

Moora

Mount Barker

Mullewa

Munglinup

Narrogin

Northam

Northampton

Salmon Gums

Scaddan

Tammin

Three Springs

Williams

Wongan Hills

York (Post Office)

York (Talbot House)

Key to blackleg risk management for your district

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 2019 Blackleg Management Guide [3] produced by Grains Research and Development Corporation (GRDC).

Canola blackleg spore maturity forecast for Western Australia – 22 May 2019 (accessible table)

This prediction is based on the weather data (January to 20th May 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.