This tree has progressed very nicely in the past growing season but I am wondering if I have a problem and would appreciate some informed comments
This is the tree Sept 14
The detail shots of the needles show that many of this years are turning brown at the tips and this is gradually spreading down each pine needle. Is is a fungus or some other problem. If a fungus what spray should I use. I have already sprayed with a fairly strong solution of Westland Plant Rescue whose main active ingredient is Difenoconazole.
I gave the tree a bath in a solution of Epsom Salts earlier in September and am wondering if this could be part of the problem,