FLX, 10 months ago

Thank you for this very scientific answer.

I think it might have started with younger/small leaves, some of them became fully yellow. (freeimage.host/i/HyL5TB9)

But only the older ones have the necrosis.

There was a lack of water during hollyday, then too much water to compensate. But it started showing small signs before that. I’ll try the fertilizer