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.
Use this interactive tool to run a crop specific forecast
This forecast is produced with disease data from the Defra funded Oilseed Rape Pest and Disease Survey delivered through CropMonitor
Light Leaf Spot forecast
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