I'm having a problem with one Phal. leaf ,too. You know how the oldest leaf will turn kind of a pale yellow and eventually fall off ? Well, this one started turning yellow towards the tip of the leaf and has been slowly progressing until half of it is little more than a brown and crinkly lost cause. I plan to take the leaf off this weekend so that whatever it is will not spread, but I would like to know if anyone has ever seen or knows of anything similar. Also, the plant has the beginning of a spike--will removing the leaf at this point shock it and make it lose the flowers? I am eager to do whatever I can to prevent this virus/bacteria or whatever from spreading, so any and all ideas will be much appreciated...
TIA!!!