The sexual fruiting body of Powdery mildew fungi is

The sexually fruiting body of Powdery mildew fungi is Cleistothecium.
Powdery mildew is a fungal disease that affects a wide range of plants.
Powdery mildew fungi can only reproduce on their living cell host and reproduce both sexually and asexually.
Sexual reproduction is via chasmothecia (formerly cleistothecium), a type of ascocarp where the genetic material recombines.
The overwintering survival structure produced by the powdery mildew fungi is called the chasmothecia. This is a round, dark, hard resting structure.