leaves turning white on paph. and phal.

[oceanwithin]

Hi All,

I caught orchid fever about a year ago so I'm pretty new to the quirks of these plants. Recently, two of my orchids have slowly started to show a white tinge and/or very small white spots on their leaves. The leaves on the plants in general are starting to look and feel very "floppy" and a bit sickly. I have inspected them closely and I don't see any bugs or scale, or at least not that I can identify. Does anyone know what this might be, and how I can remedy the situation?

There are other orchids on the same window sill that are flourishing. Typical watering/feeding schedule is once per week (distilled water) and diluted orchid food every few weeks. I used to mist the leaves every day (distilled water as well) because it is dry here in AZ but I have kind of tapered off with that.

Photos can be found here:
Index of /photos/orchid

Thank you in advance for your help with this!!

Kelli Bricker
Chandler, AZ