The normal shedding of old leaves start with the oldest leaf, so when you see this happens on the bottom most leaf on the old fan, you don't have to worry.
It is also something that you need to get used to with time and experience because different paphs discard their old leaves slightly differently.
Usually yellowing or browning starting from the tip of the leaves or the whole leaf all together. This can happen while the leaf is still fleshy or dry. Some old naturally dying leaves may develop some spots and some do not.
Some old fans lose one leaf at a time and some lose a bunch, if not the whole fan, at the same time.
Once you go through this once for every paph you have, you will not worry the next time because they lose the old leaves the same way they did the first time. and then it becomes a pattern for you to identify what is going on.
Disease usually start away from the tip, although it can start from the tip, and they start with browning that spreads fast as opposed to slow and gradual yellowing or browning of the whole leaf starting from the tip.
Paphs are fairly disease free. I think the worst is the collapse of the entire plant in a matter of just days due to dark brown rot when summer is too hot and wet.
They can get periodic bacterial brown spots on the leaves or the center.
I have lost one paph to the brown rot on the center. I fought the disease but it wasn't worth all the effort and I just tossed the plant.
Sometimes you see reddish brown rust like markings on the leaves. This can be a result of mechanical damage. When paphs leaves are bruised, they usually turn red brown or dark color.
At first, I thought it was bacterial disease, but I learned that it was a scar mark.
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