Powdery mildew of Wheat
Blumeria graminis tritici
Triticum sp. (wheat) is the only host of Blumeria graminis f. sp. tritici. Signs on the foliage of wheat are white, powdery mycelium and conidia. As the disease progresses, the patches turn gray and small dark black or brown cleistothecia form in the mycelium mass. Symptoms progress from lower to upper leaves. Symptoms of powdery mildew are chlorotic areas surrounding the infected areas. The lower leaf surface corresponding to the mycelial mat will also show chlorosis. Lower leaves are commonly the most infected because of higher humidity around them.