Zygo leaves turning yellow

[Kaschmitz]

Is this normal for leaves turning yellow

[estación seca]

Well, it depends... old leaves about to fall turn yellow, but newer leaves should not. The commonest causes of leaves turning yellow are
-sunburn
-spider mite attack
-inadequate water
-high ambient temperatures
-low ambient relative humidity
-dead roots unable to provide enough water to the plant.

I couldn't comment further without more information about your growing conditions, and probably photos.

[rbarata]

My Zigo loses its older leaves at this time of the year, at the same time as the new growth is maturing.
But I agree with ES...a photo of the whole plant would be helpful.

[Kaschmitz]

attached is a picture

[rbarata]

Your plant looks healthy. It seems to be an old leaf dying.

[Leo H.]

I agree with rbarata. It is completely normal for Zygopetalums to shed older leaves and after two years or more a bulb might be completely leafless. To be totally on the safe side, look at the base of the leaf. If it is mushy, further intervention might be necessary though I doubt it will be.

[Dorchid]

Plant looks great!