Help with Phal disease

[bil]

OK, for what it's worth, Looking at those the marks do not shout 'snail!'' When mine have been hit with snails, the top surface is abraded away, and what I see here is the inner material of the leaf has collapsed, causing the top surface to be depressed.

This might be down to cold or something causing small amounts of localised damage. As always, watch it carefully to see if it changes.

Spider mites. Don't mess about controlling them, kill them. Kill them ALL.

By a miticide, and spray every damn plant. Seriously. If you don't, invariably an overlooked plant will get hit badly. I have a catasetum that was it badly and I didn't realise it fast enough, so I will get no flowers off that this year.