Lc. Purple Cascade Black leaves

[dennis4246]

I bought this Cattleya in Nov last year from Normans orchids. It bloomed great. i have it in a south facing window and it now has developed a leaf that is brownish/black and the end of one leaf is black. I use Msu fertilizer at 125 ppm and 1/4 tsp superthrive per gallon of water. I don't water it until all the media is dry. wha tdo I do now. i have posted 4 thumbnails of it in my library.
Thanks
Dennis 4246

[Tindomul]

One looks burned, the others look like they are old. In anycase, if you can I would check the roots. I have mine in an east facing window and is giving me 11 blooms. I don't think it needs too much light, so maybe you should go ahead and shield a bit more from the light.

[Lagoon]

Dennis,

It looks like you're leaf is just gotten old and tired and now becomming a back bulb. The other leaves look fine.