Hi W
Sounds like it could be mealie bugs...or maybe scale.
Can you post a picture?
These links will help you with pics:
Resizing Images...originally posted 6/13/06 by Marty
Thumbnail pics in posts
Gallery Photos
The resizing is most important, should be done prior to uploading any
This page may help you to identify the problem and come up with a solution:
Diagnosing Orchid Problems
Of course, once we know what we're dealing with, your new friends here at OB will be very happy to help you
if you have any questions, please feel free to ask