Downy mildew of rose
. This is, in fact, the sporulation of the pathogens extruding from the stomata. In lettuce, the foot is infected first and this causes the plant to fall [...] 15 °C. The closer the temperature is to these 15 °C , the shorter the leaf wetness period that is required for germination. Inside the plant, the pathogens [...] 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 growth