Sphaerotheca Cleistothecia Each Expelling A Single Ascus

Sphaerotheca sp. cleistothecia closely resemble Erysiphe cleistothecia, but only contain one ascus per cleistothecium. The appendages are non-branching.

Fungi of the genus Sphaerotheca cause powdery mildew disease on roses, peach, gooseberry, hops, strawberry, currant, cantelope, squash, dandelion, gourds, and hackberry.

Representative species:

Sphaerotheca pannosa

causes powdery mildew disease on peach, nectarine, and apricot

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