SHALL I REPOT THESE ORCHID PLANTS

[silken]

Cattleyas and some Dendrobiums should almost be dry before watering again. This is thru to the bottom, not just on top. That could be why the roots are rotten and even why some buds dry up-because there are not enough healthy roots to support them. I would be tempted to move at least one or two Cattleays into some bark mix and see if that works better for you. If it does, then you can move more later. I agree with others that the media looks wet and maybe broken down. Cattleya bulbs often get wrinkly with age. Often only the newest one is plump as in picture #2 of the 2nd set, new ones look plump and old ones are wrinkled.

[Bud]

you got sound advice from everyone on this thread....but when you repot make sure to spray hydrogen peroxide or physan20 to rule out bacteria/ fungi infestation....you never know

[james mickelso]

Catts, Dendrobiums, and most any other orchids do not take full sun. Unless they are under some sort of cover even a tree and have shade on them, they get sunburn very quickly. If the tree is very tall and the dappling is moving all the time, they could still get sunburn. The shrivling is due to bad roots or being too dry. the bad roots can't take up enough water to keep the plant hydrated. Send pics of the plants. Pics of leaves and tops of pots.

[james mickelso]

Also the canes of the dendrobiums shrivel because they are supporting the new growth which have no roots yet. Same with catts/laelias and many other orchid types. The old canes (pbulbs) move their water/starches/sugars to the new growth as it emerges and before it puts on roots of their own. It is normal.

[nlm2951]

I also remove with a soapy water and tooth brush that brown cover of the pseudobulbs, scales get in there, and destroy it, after use alcohol