Downy mildew of rose
General Peronospora sparsa is a plant pathogen that causes plant diseases, such as downy mildew of rose and diseases on blackberries, raspberries and other [...] fruits. They cause lesions on the upper leaf surface, bordered by the veins, which are first yellow and then turn brown. On the underside of the leaf fluffy [...] this causes the plant to fall over. In cabbage the stem is also infected in severe epidemics. In blackberry, red stripes may occur on the stems and petioles