Difference between old and new bunt

Old Bunt                                            New Bunt                              

All tillers of a plant attacked      Only few tillers attacked

 Each ear is fully attacked          2-3 grains are attacked

 Grains attacked as a whole       Grains partially affected

 Seed borne & systemic              Infection is aerial

 Found in hills                              Found in plains

 Distribution worldwide                In few countries

 Spores smaller in size                Double in size

 Sporidia are in pairs                   No pairing