Leo - if you post 5 times or so, then the orchidboard server software will then allow you to do regular things (such as to upload photos).
So post about four times more - and you should be able to upload photos for showing the plant, and the rotting region.
Anyway - to cut down on chances of stem rot, my own approach is :
1) provide a growing area with very gentle air-movement.
2) keep stem and leaves dry (even though we know that orchids do indeed get rained on etc - and some of my orchids get lawn sprinkler water dumping water on them every night - leaves, stem, and all).
3) prevent 'regular' roots from being wet or overly wet for relatively long periods of time - even though we know that some orchid roots do/can adapt to wet conditions.
4) maintain suitable growing temperature and temperature range (and lighting levels).
Satisfying #3 above could involve considerations of pot type (eg. size and number of drainage holes), potting media type (size of media and what the media is), and watering technique.
And - one popular item I think - among orchid growers in Australia, is yates anti-rot phosacid. That is a good one to have in the kit, among other items like copper sprays, thiomyl (clearly's 3336), and mancozeb.
But - in any case, some pics to show the orchid's condition will help with assessment. Also - if there's uncertainty about the state of the roots and media, then unpot to check on the roots too - just in case.
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