1 Choose a station with Crop/ Disease license activated. 
2 Click on the Disease model icon on the left side of FieldClimate. 
3 Click on the Disease model icon on the left side of FieldClimate. 
4 Choose the time period to display the disease model. 14 to 60 days works best.
5 Use the ? on the far right to provide a description of the models operation. 
6 PRIMARY INFECTION
• Infection occurs in early summer from oospores.
• It needs wet leaves or relative humidity and rain above 70 %.
• Depending on temperature, macrosporangia can develop within 16 to 24 hours.
• Strong rain (continuous rain of 5 mm) can spread their zoospores when they are developed.
• If this happens and leaf wetness has lasted long enough, we have a primary infection. 
Charts represent the data collected through May. We can see that we had an incubation period was started on May 10th, with a severe infection, so we can expect occurrence of downy mildew in several days.
7 Use the ? on the far right to provide a description of the models operation.
8 SECONDARY INFECTION
• Infection is possible only if mature oil spots exist (they can sporulate).
• Sunlight inhibits sporulation (sporangia is only produced by night).
• Sporangia are produced if temperatures are above 12 °C and relative humidity (RH) is very high. The optimal temperature for sporulation is 24 °C.
• If temperature rises above 29 °C no sporulation can take place.
• If RH of more than 95 % occurs during the night and if this lasts for accumulated hourly temperature of more than 50 °C the sporulation is concluded.
• Lifetime of sporangia is limited to one day and to cause new infections it must be spread. This can be done with rain or wind.
• INCUBATION PERIOD is the time between infection and mature oil spots. 
Charts represent the data collected through July. We can see that we had three severe infection events through July, with three incubation periods that were 5 to 6 days long. Conditions for infection were met, so we can expect the occurrence of downy mildew.