To whom it may concern, I have two lemon trees (not sure what kind, sorry) and one of them is not doing very well. I have looked ALL over the plant for some kind of visible pest and I am not able to see any. The leaves are starting to yellow, but only slightly and then the tips of the leaves start to brown and curl a little bit, then they drop off. I have had the trees for about 4 years and they have grown considerably over that time period. I have separated them as the other is very healthy and I do not want to risk it getting sick as well. I am including some photos and I hope someone will be able to tell me what is happening and how to save my poor tree.
All that pops into my mind is Manganese/iron deficiency. But it's a bit strange that such a thing could suddenly become an issue if you've been growing these fellows for 4 years? (strange to me anyway, but I am still learning).
