Powdery mildew
and makes it harder for the fungi to enter the leaves To reduce chances of powdery mildew in greenhouses, it is advised to first ventilate by only opening [...] noticeable. In case of a severe epidemic, the fluffy colonies also appear on the upper side of the leaves. Many sweet pepper cultivars react to 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