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Under watering is usually case if plant is in a direct sun for long periods of time. Some of us will only mist plant instead of watering. The signs of under watering are essentially same as over watering. The thinner leaves of plants especially Miltonias will have accordion like leaves.
The treatment for over watering is to re pot as soon as possible. As re potting is taking place cut off roots that do not look healthy. Re pot in a coarser medium. This will allow plant to get support it needs. Be sure that plant dries out before being watered next.
Occasionally you plant may not have any viable roots and may not respond to re potting. If this is case then I would recommend that you place plant and container in a clear plastic bag and loosely tie it and place it in indirect light. The humidity will help.
Occasionally with over watering you will notice that roots and then rest of plant may turn black. This is "black root" disease. Use a fungicide on this and probably you can save it.
For under watering main stay of treatment is to water more frequently. If plant feels loose in pot then re pot it. Once you do this you will notice that there will be less wilting and greener healthier leaves. If there is still some wilting plant will need more humidity. This can be accomplished by placing plant on a tray that has pebbles in it and is half full of water. Remember you do not want roots to sit in water.
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