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.


OK. Wow, I try to learn something new every day! Today, it got
fed to me (hope that counts). I guess my books don't like to
talk about sex.

FORGET WHAT I WROTE! Listen to Dr. Nina!

Jim Lewis - - Tallahassee, FL - "People,
when Columbus discovered this country, it was plum full of nuts
and berries. And I'm right here to tell you the berries are just
about all gone." -- Uncle Dave Macon, old-time musician

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