Quote:
Originally Posted by gixrj18
Well, on my Encyclia that died that way, the yellow just kept spreading until the plant was dead. This happened in a period of about two weeks. So I just remove yellow bulbs.
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What species of encyclia are you speaking of? Some species are prone to bacterial and fungal infections that many other orchids are immune to. What you describe sounds bacterial in nature, did any of the bulbs get mushy or have a strong odor. If so this would be a sign of bacterial rot which can be caused by over watering and or too high a humidity level.