There is no right answer to this question. The most I can tell you is that
if the fungus has already invaded, you will probably need something
systemic. Which chemical will work best depends on which fungus you have.
The Ortho "All About Growing Orchids Book" has a pretty good pest and
disease section, you might also consult the AOS Pest and Disease Handbook.

The first line of defense is removing the obviously-infected plant tissue,
with a good margin into "clean green." It is also important to switch out
your chemicals if you find you have to spray more than a couple of times, to
avoid creating resistant fungi or bacteria.

--
Kenni Judd
Juno Beach Orchids

http://www.jborchids.com

"Dave and Kim" wrote in message
. ..
What is the best fungicide after a fungus has infected an orchid?

Curious