Our disease forecasts are based on the latest viticultural research. For Oidium, we are guided by the OiDiag Index according to W. K. Kast and make specific adjustments based on further research, data recording, field trials and experience.
For the peronospora forecast, VineForecast uses different models depending on the phase. Oospore germination and primary infection are calculated according to the methodology of Caffi & Rossi. Secondary infections are calculated using the leaf wetness hours (BNG). The risk index is calculated from the sum of the temperatures during hours of leaf wetness (for each day). If the value is between 75-125, there is a moderate risk of infection. If the BNG is between 125-200, a medium risk of infection can be assumed. Values above 200 indicate a high risk. In addition, the susceptibility and the phenological stage are taken into account and these limit values are adjusted accordingly.