Phal Belina leaf dying/spot problem
 

Hi, I recently noticed one of the leaf from my phal belina is starting to die off. The tip of the leaf is turning light black (labeled #1). May someone please tell me what's causing this?

Also, the leaves on this phal have been developing white-yellowish spots ever since I got it as shown in #2 (got this phal ~2 years ago). Anyone know what's causing the spots? the spots seems to be on every leaf.

Additonal info:
I do not see any pests crawling around. Maybe this will rule out pest problem?

The phal is placed right next to window that receives direct sunlight. However, I have 5 other phals next to this belina and NONE of them are having the leaf problems this belina is having. Can this belina be more sensitive to the amount of sunlight it's receiving compared to the other phals?

Thanks for the help!

http://i60.tinypic.com/xoibzn.png
http://i58.tinypic.com/2sbjvb5.jpg
http://i61.tinypic.com/s1oht3.jpg

Do the leaves ever have standing water or mist droplets on them? Could be fungal...

yeah after I water this phal sometimes there are water on the leaves. I don't wipe it out because I see it dry out after 1 hour. So it's either fungal or mites?

The darkish part looks like erwinia, you should cut large (see thru in light to watch for infusions going further). Do not touch any plant with the hand receiving the sick part before trashing it and wash/disinfect hands thoroughly.

Erwinia means some mechanical damage has been done and the bacteria entered…

The little dry spots could be fungal or mites (or both)

To prevent such infections is better to use Inocucor from Ray.