Powdery mildew
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. In most [...] General Powdery mildew is a fungal disease that is caused by many different species of fungi such as Erysiphe, Podosphaera, Oïdium, Leveillula. Damage [...] through the stomata and there are more stomata on the underside of the leaf. On the upper side, yellow spots are noticeable. In case of a severe epidemic, the