- Does the white can be scratched? I don't think so but you never know… If you use a magnifier, is there some sucking point?
- Is it smelly? Looks like liquid inside? (do NOT cut to see) = somehow a bacteria is eating up inside.
- Wipe a bit of cotton wool with alcohol on (title 70°, if you don't have, take methylated spirits, add about 46% of water to it and up you go). Wipe under the leaves especially start with the nice leaves, end with the ugly ones. If there's yellow-brown mark on the wool, there's spider-mites. Anyway, given the state of the leaf between the "dots", I guess there's been quite some around.
- Has the phal been subjected to temperatures below 18 with wet roots? So it could be edema (nothing to do save watch out nothing else bad happens)
Can we have a general view of the plant?
Now for cures:
- I'd treat for spider-mites, the plant and all the others around. (emulsified neem oil, Masai™, pyrethrin based products labelled for spider-mites)
- If it smell bad, something is rotting, there's be some cuts (or none if no hope)
That's all I can tell for now. :-/
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