Puccinia graminis is an obligate parasite. It is a heterocious parasite. It causes a rust disease – black stem rust of Wheat. Prime purpose of this lecture is to present on Puccinia Graminis. It’s life cycle on Wheat and on Barberry. Wheat is a primary host. Barberry is a secondary or alternate host. Acediospores geminates on Wheat stem or leaf to form binucleate, dikaryotic filamentous well developed, branched, intercellular mycelium. Finally focus on Puccinia Life Cycle.