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How CropAlert™ Works for Blackleg

CropAlert for blackleg is based on the blackleg sporacle model1 for predicting onset of seasonal ascospore showers emanating from canola residues. The model utilises daily weather data and future weather scenarios to predict the likely commencement of seasonal blackleg infection period in canola. A simple postcode input returns a predicted ascospore maturation risk rating for blackleg. Each postcode is aligned to a weather station in that locality.

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Interpreting CropAlert Warning Results for Blackleg 

As the predicted spore maturation develops, the pointer on the scale moves from low (yellow) through medium (orange) to high (red). When the pointer is at yellow it indicates a low probability of a spore shower occurring and orange indicates commencement of ascospore development. Red indicates spore showers are likely to have commenced or are imminent, hence risk of blackleg infection is high if canola is at a susceptible stage of development (between 2 and 8 leaf).

These results are for the current date. 

Example results

Blackleg example

The forward date for the potential spore release shown above is based on rain predictions of greater than 4 mm per week. The risk in locations where blackleg spores have not yet matured can change as the season progresses. Growers and advisors should regularly check the scale closer to the forward projected commencement of spore release to monitor changes in disease risk status.
Blackleg graph

CropAlert also provides growers with a mitigated vs unmitigated % risk of disease infection based on the agronomic input factors provided by the user. The use of an effective seed dressing, an in furrow fungicide application and/or a resistant variety among other things can mitigate the risk of a blackleg infection.  


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Cautionary Note.
It must be noted that CropAlert is a tool, and should not be solely relied upon in the decision making process for disease control. Growers should always seek advice from a qualified agronomist or advisor when deciding on disease control options for blackleg.

Acknowledgement
1. The Sporacle model was developed through research undertaken by the Department of Primary Industries and Regional Development, Western Australia (DPIRD)2, with the support of the Grains Research and Development Corporation (GRDC). We gratefully acknowledge DPIRD co-operation.

Weather data is sourced from the Bureau of Meteorology. Forecast Weather data is sourced from Weatherzone.

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