Some of the problem might be scale but that usually comes off fairly easily and generally adhers to the surface of the leaf, although the effects can sometimes be seen on the reverse. I would find a systemic insecticide suitable for use on Phals for a thorough 2x spray. I use Bayer 3 and 1 for mites and insects on my Cyms, zygos, dends and masdies, but I have no experience with using it on other genera.
If the plant is valuable enough, I would test for virus.
Isolate these plants in any case until you find the cause and cure, if possible. If they are not that valuable and can be replaced, I would seriously consider doing it so as not to infect your other plants.
Last edited by Cym Ladye; 11-19-2014 at 12:24 PM..
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