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Black (stem) rust of wheat is caused by
A
$Alternaria\ solani$
B
$Ustilago\ nuda$
C
$Puccinia\ graminis$
D
$Xanthomonas\ oryzae$
Detailed Solution
Rust diseases are caused by basidiomycete fungi of the genus $Puccinia$.
$Puccinia\ graminis\ tritici$ causes black (stem) rust of wheat.
$Alternaria\ solani$ causes early blight of potato.
$Ustilago\ nuda$ causes loose smut of wheat and barley.
$Xanthomonas\ oryzae$ is a bacterium that causes bacterial blight of rice.
Hence black rust of wheat is caused by $Puccinia\ graminis$.
$Puccinia\ graminis\ tritici$ causes black (stem) rust of wheat.
$Alternaria\ solani$ causes early blight of potato.
$Ustilago\ nuda$ causes loose smut of wheat and barley.
$Xanthomonas\ oryzae$ is a bacterium that causes bacterial blight of rice.
Hence black rust of wheat is caused by $Puccinia\ graminis$.