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Which one is the wrong pairing for the disease and its causal organism?
A
Root-knot of vegetables : $Meloidogyne$ sp.
B
Late blight of potato : $Alternaria\ solani$
C
Black rust of wheat : $Puccinia\ graminis$
D
Loose smut of wheat : $Ustilago\ nuda$
Detailed Solution
Late blight of potato is caused by $Phytophthora\ infestans$.
$Alternaria\ solani$ causes early blight of potato, so this pairing is wrong.
Root-knot disease of vegetables is caused by the nematode $Meloidogyne$ (correct).
Black rust of wheat is caused by $Puccinia\ graminis\ tritici$ (correct).
Loose smut of wheat is caused by $Ustilago\ nuda$ (correct).
Hence the wrong pairing is late blight of potato : $Alternaria\ solani$.
$Alternaria\ solani$ causes early blight of potato, so this pairing is wrong.
Root-knot disease of vegetables is caused by the nematode $Meloidogyne$ (correct).
Black rust of wheat is caused by $Puccinia\ graminis\ tritici$ (correct).
Loose smut of wheat is caused by $Ustilago\ nuda$ (correct).
Hence the wrong pairing is late blight of potato : $Alternaria\ solani$.