I assume you're using PrimeAgra? I have two fans that provide air movement
in my growing area. They're not directly trained on the plants but about
three feet above them. This, plus the ambient humidity, keeps the top layer
and perhaps an inch to an inch and a half of substrate dry. If you're
having problems with mold or fungus, it's more than likely moisture related
and just lightly spraying the top layer with Daconil will take care of the
problem temporarily; but it will be interesting to get Ray's take on this,
and what he'd suggest. He's been at it a lot longer than I have.


"Charles P. Peters" wrote in message
...
I have considered adding 1/2 teaspoon of Physan 20/gallon on a monthly
basis for algae or fungus, but I'd check with Ray at Firstrays.com and
see what he thinks. They have an excellent discussion forum on the site.

Geir Harris Hedemark wrote:

I have a problem with fungus growing in my semihydrophonically planted
orchids. It is bad enough that it is possible to see the whitegreen
fungus on the roots through the transparent pots.

What am I doing wrong? How do I get rid of the fungi before it kills
off my orchids?

Geir