• The disease appears only at the time of grain setting
• The smutted grains scattered randomly in the ear head
• The affected grains gets converted into gall like bodies which are bigger than normal grains
• Greenish swollen grains appear in the initial stages 
• The greenish sorus turns to pinkish green and finally turn to dirty black colour

Identification of pathogen:

• Spores are globose in shape and 7 to 11 microns in diameter
• The epispore is densely pitted and has a rough surface
• The spores germinate readily in water, producing septatepromycelia
• Sporidia are formed on these both terminally and laterally

Managment:

• Use resistant varieties