I noticed quite a lot of Fir needles on the ground which is unusual for our tree. It is a big one, probably at least 50 years old. There are other Fir trees close by without this issue. It's May, and all the trees including this one have bright new growth. BUT, this tree is also showing dry brown Needles in sections of all the outer main branches. I am afraid this is a symptom of drought. I don't see any markings on the needles which make it look like a disease. Any advise on how to keep this tree alive or what to expect?