We have two Tangerine Trees, another which is a cross between Tangerine and Orange and a Kumquat; all the leaves on these trees are yellow wereas our other trees, three Apples, Apricot, Grapefruit, Lemon, Lime and two Orange Trees have healthy green leaves. I think there must be a deficiency of some sort but not sure what; has anyone any idea's?
Thanks
Jim B



