Black rust of wheat is caused by (a) Puccinia (b) Ustilago (c) Albugo (d) Phytophthora
Option A Black stem rust is caused by Puccinia graminis tritici. The genus Puccinia includes 700 species, which cause rust diseases of many economic plants such as wheat, barley, oats, etc. It is called a rust because of the reddish brown color of the spores that are found chiefly upon the surface of the host leaves and stems. P. graminis is heteroecious i.e., requiring two hosts, wheat and barberry for the completion of normal life cycle.
