Hi, Wendy,

You might try a tiny drop of Physan 20 (most nurseries have this) in a
pint spray bottle. Spray the roots and then be sure to wash off
(although I have never had any ill-effects from spraying the greenhouse
walls with diluted Physan).

.. . . Pam
Everything Orchid Management System
http://www.pe.net/~profpam/page3.html

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Wendy wrote:

*g* Oh yes Gene, that's what it looks like the mildew that you see on patio
furniture! It
is not powdery like mould & won't just wipe off?
So what do I use for mildew?
Cheers Wendy
"Gene Schurg" wrote in message
hlink.net...
Uh....Wendy....were you spray painting the lawn furniture black again?

Could it be mildew?





"Wendy" wrote in message
news:hKPYa.40514$Ne.39623@fed1read03...
I have a couple of plants aerial roots that have black on them. I
doesn't
just
wipe off? Any thoughts on what to do?
Cheers Wendy