Possible Mildew?

[Pearcy001]

Hi guys, I was giving my olive a water today and realized a couple of leaves have begun turning yellow and brown. I also noticed a subtle powdery white residue across most of the leaves and came to the conclusion (with no experience) that it could possibly be mildew and/or mildew related. The mildew(?) is across most of the trees leaves, but there is only about 5 yellow/brown leaves at this point. There's a chance that I've just seen a couple of leaves change and freaked out, any help would be greatly appreciated.

Cheers,
Pearcy.

[treeman]

No mildew and nothing to worry about. The white stuff is just a bit of calcium from your water.
The browning leaves are normal

[Pearcy001]

Thank you treeman, much appreciated