Loose smut of wheat is caused by

Ustiago nuda

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Cystopus tritici

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Puccinia graminis

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Aspergillus graminis

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Solution

The correct option is A Ustiago 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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