Is this a sign of a viral infection on my C. Fabia seedling? I recently moved and had all my plants sitting outside during the move. At first, I thought it was sunburn, but after reading up on viruses, the black discoloration seemed suspect. I don't reuse water between plants and I sterilize my cutting tools, so the only source of the virus that I can think of is from the original grower.
http://staugorchidsociety.org/PDF/Vi...ySueBottom.pdf
I also posted this question in the AOS Facebook group and received so many responses stating that this is black rot. The black discoloration has been present since my move 2 months ago and has not spread. The plant is also currently in active growth with two leads.