Powdery mildew
colonies mostly occur in these crops. In covered roses, the colonies appear first and foremost on the upper side of the leaves. In most crops, the white [...] small. Wind and draught in greenhouses promote disease. In greenhouses, dispersal of spores over small distances (limited time) mostly happens via workers’ [...] fairly similar in all plant-pathogen combinations. The symptoms are white fluffy colonies, first and foremost on the upper side of the leaf. In severe epidemics