whoops-same situation on a catt leaf. the leaf was turning yellow after a
black spot. I cut off the burnt leave- treated cut with physan.
"Ray" wrote in message
...
Definitely sounds like burning, but the temperature, per se, isn't the
issue, and it's certainly not the day-night fluctuation in ambient
temperatures. What is likely to have happened is that they received too
much direct sunlight for the types of orchids they are, or were not
properly
transitioned into a brighter environment from one that what less so -
probably a combination of the two. The result is that you get localized
overheating due to the solar energy, with the ambient temperature being a
relatively minor, but contributing factor.

The damaged tissue will not recover, but now that your plants are no
longer
in such conditions, they ought to grow normally and will eventually lose
the
damaged leaves.

I recommend that you do not attempt to remove the damaged tissue, as the
patches are not open wounds, so do not provide a path to allow pathogens
in.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!

. . . . . . . . . . .
"Lil" wrote in message
om...
After a week growing orchids outside in Napa, I noticed that some of
the orchids were developing straw-colored patches that kind of the
same color as ripe corn.

Are they burn patches, where the part of the plant may have had some
direct sun-exposure? Will the plants recover? (I've moved them back
inside where temperatures don't fluctuate as much. I noticed that the
temperatures have a 30 degree range outside. ranging from 60's to
90's.)

Any ideas on how I can resuscitate the orchids will be greatly
appreciated. Thanks in advance.

Lil