https://www.novaspina.com/downy-mildew-of-the-rose-peronospora-sparsa/
Downy mildew of the Rose (Peronospora Sparsa) - Vivaio Novaspina
May 24, 2022 - It forms initially yellowish and translucent spots which then extend into large brown areas, with a rather varied symptomatology. The optimal temperatures for...
downy mildewof theperonospora sparsarosevivaio