In our last blog we went into the details with the primary infection of Downy mildew and in this one we will focus on secondary infection.
How downy mildew overwinters and infects the vines?
Downy mildew occurs mostly in cool, moist weather, usually in early spring or late fall. Spore production is favored by temperatures cooler than 18˚C, and by relative humidity approaching 100%. Fungi Plasmopara viticola