No practical control measure is available. Grazing excessive growth will allow light and air to keep the plants dry, thus reducing the severity of powdery mildew. Spots on the stem are black and may cause the plant to lodge. The hulls of grain may sometimes become infected and turn black. Use seed treatment fungicides, crop rotation and bury crop residue.
Plants are dwarfed and can be either brilliant red or yellow.
Symptoms usually appear following a high population of aphids and small grain greenbug. Lesions or spots appear on leaf blades as oval to oblong water-soaked spots that are buff to light brown in color. A light-yellow zone forms a halo around the brown lesion. The bacterium enters the leaf tissue through stomata or an insect puncture. Suggested controls are seed treatment, crop residue management and rotation.