Powdery mildew
underside of the leaf. On the upper side, yellow spots are noticeable. In case of a severe epidemic, the fluffy colonies also appear on the upper side of the [...] conidiophores in this case also protrude from the stomata. Conidia are the main means of dispersal. They are dispersed by wind, as are the ascospores. In general [...] production, so the net effect of the RH is very small. Wind and draught in greenhouses promote disease. In greenhouses, dispersal of spores over small distances