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Powdery
mildew, caused by the fungus Erysiphe graminis, generally has not been a serious
problem in Arkansas during the past few years except on a few varieties.
Symptoms appear on leaves and leaf sheaths as tufts of off-white cottony fungal
growth that can be rubbed off. The fungus produces asexual spores on the fungal
growth and sexual spores in black fruiting bodies that may develop later. The
disease can be found in many fields during stem elongation stage, but on most
varieties it tends to disappear as the season progresses. Caldwell and Keiser
are two varieties that are exceptions to this generalization, and powdery mildew
has occurred on flag leaves and heads of these varieties in the past.