Problem with symbidem's
 

Hi
I have 4 orchids in 4 pots and 2 of them are flowering but something is eating the petals and they are falling of the stems.
The petals show signs of something eating at them but i cannot see anything around them.
Could you please help me.:((
I have also got some problems with black spots on the leaves NEED HELP.

Check between the leaves. Look in the soil. Snails and slugs love eating orchids. Look for grasshoppers too.

Can you post a couple of pictures?
Joann

I agree with King OO Growing on the possibles.
Just about anything will try to get to your CYMBIDIUMS. Hopefully you have them off the ground and on a bench of some sort, this is one major way to stop or atleast slow the pests up.