Summary:
Downy mildew is highly destructive in all grape-growing areas of the world. The symptoms, caused by the fungus Plasmopara viticola, firstly appear on the grape leaves 7-10 days after infection. In order to control the pathogen, approved pesticides are used. The downy mildew model estimates infection from an organism’s using cardinal temperatures (Tmin, Topt, Tmax) and leaf surface wetness duration requirements for infection (Wmin, Wmax).