Black (stem) rust of wheat is caused by

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(C) : Black stem rust is caused by $Puccinia graminis tritici$. The genus $Puccinia$ includes $700$ species, which cause rust diseases of many economi

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Puccinia graminis

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(C) : 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 its normal life cycle.According to the nature of the spores, the life cycle of $P. graminis$ is divided into five stages.It is during the teleuto stage that the teliospores produce dark brown to black pustules on the surface of stems and leaves of the wheat, which results in 'black stem rust of wheat'.

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