A) Pucdnia graminis
B) Ustilago
C) Pythium
D) None of these
Correct Answer: A
Solution :
Pucdnia graminis causes black rust of wheat. The rust is host specific. P. Graminis tritid is specific to wheat while P.graminis hordei is specific to barley. Loose smut of wheat is caused by Ustilago nuda tritici. The damping off of seedlings is caused by Pythium debaryanum.
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