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Rothamsted Research has updated its oilseed rape online disease risk forecasts for light leaf spot and phoma leaf spot for the 2013/14 growing season.
Publications relating to Phoma stem canker
Phoma stem canker (blackleg), caused by Leptosphaeria maculans, is an important disease on oilseed rape (canola, rapeseed,Brassica napus, Brassica juncea, Brassica rapa) causing seedling death, lodging or early senescence in Australia, Canada and Europe.
Prediction of 10% plants affected with phoma leaf spot
This forecast provides information on the date when we expect 10% of oilseed rape plants to show symptoms of phoma leaf spot, generally regarded as the threshold when considering the need for a fungicide application targeted against phoma.
For reference, the maps below allow a comparison of the previous three years updated average regional forecast for the percentage of crops with >25% affected plants
The light leaf spot forecast has been developed using the Defra-funded Winter Oilseed Rape Pest and Disease Survey results. The forecast is based on crop and weather factors.
The fungus (Pyrenopeziza brassicae) which causes light leaf spot is able to survive the summer months on debris from the previous oilseed rape crop and to a lesser extent on rape volunteers and vegetable brassicas.