Parsley

 Powdery mildew on parsley leaves (Erysiphe heraclei) upper surface (left) and lower surface (right)

Powdery mildew on parsley stems (left) and a close up of the spore production (right).

Apple Mint

Apple mint is very susceptible to infection by powdery mildew

Close-up of powdery mildew on upper surface of mint leaf