How does powdery mildew differ from other types of mildew?

Powdery mildew is specifically characterized by its distinct appearance, which includes a white powdery substance that develops on the surfaces of leaves, stems, and flowers. This powdery texture is actually made up of conidia, or spores, produced by the fungus responsible for powdery mildew. The presence of this white coating is a definitive symptom that helps in identifying this particular type of fungal infection, distinguishing it from other types of mildew or fungal issues that may manifest differently, such as causing yellowing or dark spots rather than a powdery film.

While powdery mildew thrives in conditions of relative humidity, it can also develop in fairly dry conditions, which sets it apart from many other fungal diseases that prefer high humidity. Additionally, although it can infest a variety of plant types, it is not limited to flowering plants alone, nor is it beneficial to them; in fact, powdery mildew can weaken and damage plants significantly if not managed properly. Therefore, the defining characteristic of the white powdery substance on leaves is what makes this answer the most accurate.