I have a young apple orchard.  In the last few weeks, I have noticed several of the outer branches on the Honeycrisp have yellowish leaves and a slight curl.  Some of the branches have progressed to having brownish leaves and are even more curled.  The tree appears to be getting adequate water.  None of the other trees in the orchard are experiencing this.  I would appreciate any help you can offer.  Let me know if you need more information.  Thanks!