Use the phoma leaf spot forecast to guide crop monitoring and help time fungicide sprays in the autumn. Based on temperature and rainfall information, the model predicts treatment threshold starting-week dates at hundreds of locations.
About the forecast
Temperature and rainfall information* is used to simulate the development of Leptosphaeria maculans – a key pathogen responsible for phoma leaf spot and phoma stem canker.
The forecast page (<1 of 2>) predicts the date of the starting week when 10% of oilseed rape plants could potentially show symptoms of phoma leaf spot.
This level of infection relates to a treatment threshold for varieties with lower disease ratings for stem canker (7 and below).
The tool also shows how the current year compares to recent years – allowing ‘earliness’ or ‘lateness’ to be assessed.
The predicted infection status page (<2 of 2>) shows the proportion of the crop currently (today) forecast to have ‘no symptoms’, ‘infections taking place’ and ‘10% incidence'.
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