Answer: This could be a reaction to a high pH level, which would tie up available nutrients, especially iron. I would suggest fertilizing with something acidified, such as Miracid or Miracle-Gro, to see if this helps correct the problem. Also, the tree may be planted too deeply or the roots are in a poor-draining soil that remains wet for extended periods. If this is the case, you may need to dig the tree, amend the soil so it drains quickly, then replant (at the same soil level as the tree was growing in the nursery container).
Best wishes with your tree!
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