Cereal grain disease is a type of plant disease caused by fungi, bacteria, or viruses that affects cereal grains such as wheat, barley, oats, and rye. The most common type of cereal grain disease is SMUT, which is caused by a fungus and results in the formation of black spores on the grain. SMUT can cause significant yield losses and reduce the quality of the grain. It is important to identify and control SMUT in order to protect cereal grain crops.