Didn't think it would happen to me.... I was showing off my plants today and from across the room I saw a huge black spot covering the whole leaf of one of my Blc. orchids. It's BIG and it just happened because I didn't notice a thing when I watered them last...
On closer inspection, it seems to have black down into the bulb of another one. The leaf is dark black but still the same texture as it was - perfectly smooth - no indents or rot. But it's extremely black for about the top 2 inches of the leaf...
I moved it away from the other orchids anyway... so odd..... it's one of the ones I bought from the NYC show...