Powdery mildew isn't yellow, and I have NEVER heard of it on an
oak!

Powdery mildew is common on oak, but the "powdery" stage is hard to
see- whereas the sexual state is large and distinct. It starts out
bright yellow, and then, as it matures, it turns chestnut brown.

The Tulasne brothers, pioneers in plant pathology, figured out that
the powdery stage and the sexual stage were parts of the same
organism in 1861, and the "Father of Mycology", Anton de Bary, nailed
the details in 1863. I am very proud to be an academic descendant of
de Bary's, since my chair was a student of Fitzpatrick, who was a
student of one of de Bary's students.

Nina, who is now studying the genus Phytophthora, which De Bary named in 1876.

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