Rothamsted Research

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Phoma forecast

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.The forecast uses temperature and rainfall data to simulate the development of the Phoma fungus on crop debris and subsequent infection of young plants. The full model uses data from 01 July through to 26 September, so this forecast should be regarded as the final forecast for this season (Forecast updated 5 October 2016).  

Prediction of 10% plants affected with phoma leaf spot

Click on the "pointer" symbol nearest your location to see the prediction date for your area. 

Adapted from Crown copyright data supplied by the Met Office

  • Sites with a red marker: site has already passed the predicted date for 10% plants affected.
  • Yellow marker - predicted date for 10% plants affected within seven days.
  • Blue marker - at least seven days before the prediction date for 10% plants affected.

Download a table of all sites.

This forecast is validated with disease data from the Defra funded Oilseed Rape Pest and Disease Survey delivered through CropMonitor and produced in association with Weather INnovations: