Fusarium Purple Ring - Useful Diagnostic or Myth?
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Old 06-23-2022, 07:00 PM
nhbeek nhbeek is offline
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Fusarium Purple Ring - Useful Diagnostic or Myth?
Default Fusarium Purple Ring - Useful Diagnostic or Myth?

So I had a problem oncidium that was in declining health with rotting backbulbs and dying new growths. I decided to try and cut off a healthy lead and lo and behold there was a bright purple ring in the rhizome.

That plant is now gone since it was clearly diseased with something. The problem is that after dealing with that I noticed some of its neighboring cattleyas had dying back bulbs. That isn't too concerning generally speaking, but I cut into the rhizome near those backbulbs and, well there is a purple ring.

So is the purple ring an actual diagnostic symptom or is that BS?

Last edited by nhbeek; 06-23-2022 at 07:03 PM..
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Old 06-23-2022, 08:08 PM
Dimples Dimples is offline
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Fusarium Purple Ring - Useful Diagnostic or Myth?
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It's bs. Fusarium isn't nearly as common as random sources on the internet would lead you to believe, but people on the internet latch onto things they read/hear and run with it regardless of the validity of what they're saying.

I just did a quick google search for info about fusarium in orchids from .edu sources and not a single scientific paper (quickly looked at 3) mentioned a purple ring in the plant tissues as a diagnostic tool or symptom.
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