sentences:  As a defense response, the cells produce papillae to prevent cell entry but is typically not seen successful.It is believed C. graminicola has a biotrophic phase because the plasma membrane of the epidermal cells is not immediately penetrated after invasion into the epidermal cell wall.Between 48–72 hours after infection, "C. graminicola" shifted from biotrophic growth to nectrotrophy (lesions appear).