11 year old spruce with first time browning needles
The photos lack the detail needed to diagnose the cause of the dieback with any certainty. However, this response to a similar question may be instructive:
If you conclude that cytospora is present, go here for more information:
If you conclude that cytospora is not present, using this diagnostic tool may help you identify the problem:
If you are still uncertain, ask a certified arborist or forester to assess the tree's health onsite and recommend a course of action.