Hi everybody,
I have a 3-year-old Yuzu Lemon tree, which I keep on my balcony facing east. It gets some sunshine up till about noon. Lately, I have noticed white shadows on the leaves, which look like it's been splashed with dirty water. The air outside wasn't clean this summer, some construction was going on the neighbouring buildings, and I thought it might be from the cement dust, but when I washed the leaves, the white dirt shadow stayed on. Can you advise me what it could be? Maybe a lack od a vitamin or mineral? I give to it occasionally N, P, K flower fertilizer, and I think it has all the needed nutrients. Please see the photos and help me if you can; Thanks.
