Oats Halo blight begins as small light green oval spots with dark water-soaked centres. The spots join to form irregular brown blotches. Stripe blight produces elongated spots with no pale margins. These spots also have water-soaked centres and turn brown later in the year. Wheat Bacterial stripe produces dark green, water-soaked lesions that later turn brown.
Black chaff appears on the kernels as dark stripes on the glumes.
These often join and the glumes turn black. These symptoms occur on both wheat and barley. These diseases are sometimes confused with melanosis of wheat that is caused by copper deficiency. Basal glume rot appears mostly on the inner side of the glumes as a light brown color. As the disease develops, the grain may develop a black spot at the germ end, known as bacterial black point.