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B
Basidiomycetes
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C
Phycomycetes
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D
Deuteromycetes
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Solution
The correct option is A Ascomycetes
A. Ascomycetes
Solution: Powdery mildew of crops is caused by the fungus Blumeria graminis. This fungus belongs to the class Leotiomycetes which again belongs to the Ascomycetes family.