Factsheet DSS Septoria in wheat humidity model
Septoria blotch diseases of wheat can be caused by septoria tritici blotch (Zymoseptoria tritici) and staganospora nodorum blotch (Parastagonospora nodorum), which are both favoured by wet conditions. The Septoria humidity model estimates risk of septoria tritici blotch infections in winter wheat. Risk of attack is assumed after 20 hours with continuous wetness. A wet hour is defined as minimum 0,2 mm precipitation in an hour or minimum 85% relative humidity. Fungicide treatments may need to be applied between stem extension and ear emergence, mainly to protect the upper leaves. The DSS assumes that septoria tritici blotch is present and periods with high humidity create risk for a damaging epidemic. Weather data from GS 31 are used. In addition, the dates of occurrence of growth stages 31 and 32 are entered. The model calculates the expected date for the other crop growth stages. This can be adjusted manually. Adding information on fungicide spraying dates is vital for the model. After spraying, the model assumes that the crop is protected for 10 days. The thresholds for number of wet hours and relative humidity can be adjusted manually. The DSS is created by Aarhus University and SEGES and released in Denmark in 2017. Tested in Lithuania, Norway, Sweden, Finland and Denmark in 2018 and 2019.
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