My Fatsia Japonica is sick ;(

Gent, Belgium(Zone 8a)

I have had this plant in my garden, (I bought when still very small), for about 15 years. It has been doing very well all these years, grew to a size of over 2.50m, but this year it looks sad, the leaves are yellowing but even more concerning are the black spots that affected some leaves, these grow in size and eventually the whole leaf dies off..
Could it be a fungal, virus or bacterial disease? I didn't notice any critters on the leaves.
Any help or advise is greatly appreciated!

Some pictures of the affected leaves..


Thumbnail by bonitin
Gent, Belgium(Zone 8a)

detail of the damage..

Thumbnail by bonitin
Gent, Belgium(Zone 8a)

another sick leaf..

Thumbnail by bonitin
Gent, Belgium(Zone 8a)

on the underside close-up of a black spot..

Thumbnail by bonitin
Gent, Belgium(Zone 8a)

It is first visible on the underside, this is how it starts..

Thumbnail by bonitin
Pensacola, FL

The photos of sick fatsia are exactly like mine. How do I find the
answer to what the disease is? I just joined this group and don't know how
to use it?

mid central, FL(Zone 9a)

it may be water related, as in too much or too little. too much sun can play a part since this is a partial shade lover. have you ever fed this plant? it really looks nutrient deficient to me too. it is evergreen here but will drop leaves if the temps drop too far. i've also found that the older leaves do eventually drop off, leaving a more "naked on the bottom" effect. you can cut them back and they'll re-sprout and get full again.

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