Mesophyll Cell Collapse
For a couple of years I've been having problems with my phals. Many of the leaves are very pitted and discoloured so they are very unattractive. The plants have been tested for virus and are clear so I'm thinking it's cell collapse. Does anyone have suggestions for me, treatments, etc.? My minimum temperature at night is now 60 deg. (used to be 55) and I'm careful that the leaves are dry before nightfall. Should I be removing the leaves that are marked -- that is, does it spread from one leaf to another? Do I just have to wait for it to grow out? Thanks for any help.
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