Answer: It is normal for the inner needles of pines to fall off and have only green on the outer parts of the branches. However, there is also an insect that can cause immature browning and dropping of the needles. I don't know how large your tree is but you may be able to discourage insect populations in the center of the tree by simply hosing it off on a regular basis. Just use a strong stream of water from the hose to knock down dead needles and to make spider mites pack up and leave.
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