Powdery mildew
contact with water for no more than a few hours. Powdery mildew spores, either ascospores or conidia, don’t need nutrients or water for germination. In general [...] is not relevant for other diseases that are inhibited by reducing the RH In fruit trees, pruning should be done early in the season Do not provide excess [...] Therefore, this is where the colonies mostly occur in these crops. In covered roses, the colonies appear first and foremost on the upper side of the leaves