Help! I think something is wrong with my Dendrobiums

Not sure what's wrong with them, the leaves are turning yellow on the first one and looks like the leaves are rotting on the other one. Both have new sprouts.

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Could be natural leaf drop on the first pic but the third looks like fungus. Get the fungicide out and spray away.
Cin

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First picture: It looks like it is reacting to very cool or cold conditions and preparing to go dormant. What kind of temperature exposure does it get?
It could also be due to over watering.

Second picture: Pot-in-a-pot setup is not a good idea for dendrobiums. The roots prefer the pot to dry up quickly in between waterings. That setup will retain moisture far longer than what the dendrobium prefers. It would reinforce the indications that the plant is over watered from the first picture.

Third picture: Is it a different plant than pictures 1 & 2? It looks like rot of a bacterial or fungal nature. It usually sets in when the plant stays too wet and does not get adequate air circulation.

Fourth picture: Nothing seems out of the ordinary there. New canes do appear a bit pale when very young but should green up as they mature.
The potting mix on top appears to be dry, but do check if the inside is drying up just as fast. A dendrobium pot that stays wet for too long will kill the roots.

Time to spray with a fungicide. Also be sure that your dends dry out between waterings.

Cheers,
BD

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We could learn a lot from crayons: some are sharp, some are pretty, some are dull, some have weird names, and all are different colors....but they all exist very nicely in the same box. ...Hmmm? .

It looks fungal. It looks like the leaf axils were wet in cooler night temperatures. Water your plants early in the day so they have time to dry out at night.

Treat with a fungicide and watch your watering. Only the roots need water, actually. All the leaves of my orchids stay dry.

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Thanks everyone.


[quote=wetfeet101b;109906]First picture: It looks like it is reacting to very cool or cold conditions and preparing to go dormant. What kind of temperature exposure does it get?
It could also be due to over watering.

I have them inside the house (Long Beach, CA) with the fan on most of the time. I water them twice a week and I use spray bottle to water.


Third picture: Is it a different plant than pictures 1 & 2? It looks like rot of a bacterial or fungal nature. It usually sets in when the plant stays too wet and does not get adequate air circulation.

Third and fourth pic are the same plant. Fourth pic is the new growth coming out from the cane of the one with the rotting leaves.

You use a spray bottle to water?? That will not encourage good roots. You should let the water run freely either from a hose or watering can. After a thorough watering then leave it alone until time to water again. The spray bottle could have a bacteria growing in there....make sure to steralize your bottles and other equipment on a regular basis and dont forget to wash your hands too. Often bugs and bacteria are transmitted through the touch of your hand.
Connie

Oooooopppppss My bad, thought I was pampering them. Thanks Cj, I know nothing about growing orchids. I'm just so addicted to them and have to depend mostly on internet research and especially this site how to properly take care of them.