C'mon Wendy. You know the response: "describe the conditions," etc., etc.
"Black stuff" that doesn't wipe off isn't all THAT helpful.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
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"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