More than a month ago I noticed the new growth on my Meyer Lemon cutting showing signs of deficiency. I diagnosed it with either Zinc or Mg deficiency, but what do you think? I have used fertilizer with both micro nutes, and have sprayed the leaves with liquid seaweed many times, but nothing has helped.

I thought that my treatments would correct the problem, but now I am really worried. Is this life threatening to the tree? What should I do differently?

Any advice would be helpful.

PS - The brand fertilizers I have been using are "GROW" by General Organics and "Liquid Seaweed" by Neptune harvest.