Which of the following causes loose smut of wheat disease?

Phytophthora infestans

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Phytophthora palmivora

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Colletotrichum falcatum

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Ustilago nuda

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Solution

The correct option is B Ustilago nuda
Loose smut of Wheat is caused by Ustilago nuda. It involves mass destruction of the plant and smarts are developed all over the plant which infect the open flowers.
Phytophthora infestans causes potato blight disease.
Colletotrichum falcatum causes red rot of sugarcane.
So the correct answer is 'Ustilago nuda '.

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