Originally Posted by limak
Thanks Cheryl. Should I isolate them so that they do not infect other orchids?
This type of spotting is normal on zygopetalums. No need to isolate them. I have some zygos that are doing this, but are perfectly healthy. I think it depends on the species/hybrid; some are more prone to spotting than others.
The spots to watch out for on zygos are brown, or reddish brown with yellow/clear halo's around their perimeter. They typically mean a much more serious problem, like a virus or bacterial infection.