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Powdery Mildew
Powdery mildew is characterized by white, cottony patches (colonies) of ycelium and conidia (asexual spores) on the surface of the plant. They can occur on all erial parts of the plant including stems and heads, but are most conspicuous on the upper surfaces of lower leaves. The white colonies later turn dull gray-brown. Severe infections can cause stunting. Heads on the later, shorter tillers can become heavily diseased because they remain lower in the wheat canopy where humidity is high. As the growing season progresses, sexual fruiting structures known as cleistothecia appear as distinct brown-black dots within aging colonies on maturing plants. When severe, individual patches often merge and cover large areas of the stem, leaf surface, or head. Leaf tissue on the opposite side of the mildew pustules becomes yellow, later turning tan or brown.