Description
    Downy leafspot, also known as white mold, is characterized by small, white fuzzy areas on the lower surface of walnut leaves and pale yellow spots on the upper surface. The white fuzzy areas often fuse together so that almost the entire lower leaf surface may appear to be covered with a white powder.

Injury
    The disease is of little significance because it does not kill the leaves or cause defoliation.

Control
    No control is recommended.