Downy mildew of rose
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 due [...] and tools. Some species, for example Hyaloperonospora parasitica and Peronospora farinose are assumed to be seed-transmitted (on the outside of the seed) [...] seed). Optimum temperature for germination, infection and sporulation is relatively low, in general between 10 and 20 °C. Late in the season new overwintering