This image comes from a 8 year old(I think) Valencia Tree. I believe the issue is Magnesium or Manganese? leaning more towards Magnesium? I would really appreciate opinions. Oldest leaves only, new growth not effected and looks normal, tree is producing lots of fruit(more then it ever has) Could this be related? The PH is normally between 5.5 & 6.5 and never above. thanks for taking the time to look at ANOTHER deficiency post. Now that I think about it jeez, I am always having some kind of deficiency, every year its something, Iron, N, Mg, Mn, will it ever stop!?... probably not. Oh and never mind the white stuff, that's just surround WP, I am trying it this year for leaf temp reduction, this image is taken from the back side of the tree, that's why the coverage is poor. Anyway here is the picture. thanks for stopping by