GRAPE Powdery Mildew / U. Necator Risk

1 Choose a station with Crop/Disease license activated.

2 Click on the Disease model icon on the left side of FieldClimate. 

3 Choose the Disease model for the crop of interest.

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 • Optimal temperatures for infection are between 21 °C and 32 °C. 

    • The more hours daily within this temperature range, the higher the risk of infection. 

    • Days with more than 6 hours in this temperature range: + 20 Points 

    • Days outside of range (below 21 °C all day or over 32 °C for 6 hours): - 10 points. 

    • Days with long leaf wetness periods lead to build up of A. Quisqualis. This fungus will break down U. Necator                      epidemic. 

    • If leaf wetness lasts longer than 8 hours: -10 points. 

Periods with a risk must be covered by a fungicide applications. In periods with a risk higher than 60 points it is recommended to spray more frequent especially around the time and shortly after bloom.