I'm new to orchids and just picked up this blc. chunyeah with spots all over one of the leaves, which looks like it's the oldest leaf. The other leaves seem unaffected. Is this something I need to worry about? Thanks!
The spots are either black or a really, really dark purple. I just took a closer look and it looks like it only covers one side of the leaf and doesn't go through to the other side. Also, there are similar spots on the underside of the leaf are definitely purple.