Powdery Mildews

Leaf Diseases of Hardwoods

Powdery Mildews

powdery mildew on leaves

Powdery mildew with the white mycelium covering the surface of the leaves.

Cleistothecia (also called Chasmothecia) observed in the class lab:


Cleistothecia with one acus. Note end of appendage with ornamentation. Podosphaera.


Cleistothecia with many asci and appendages with ornamentation. Microsphaera


Cleistothecia - appendages with bulbous base. Phyllactinia


Cleistothecia - appendages with curled ends. Uncinula

Cleistothecia Drawing

A drawing showing a few different types of appendages on cleistothecia