Loose smut of wheat is due to

Puccinia graminis f. sp. tritici

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Ustilago nuda

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Tilletia tritici

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Cystopus candidus

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Solution

The correct option is B Ustilago nuda
Loose smut of barley is caused by Ustilago nuda. It is a disease that can destroy a large proportion of a barley crop. Loose smut replaces grain heads with smut, or masses of spores which infect the open flowers of healthy plants and grow into the seed, without showing any symptoms.

So, the correct answer is 'Ustilago nuda'.

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