Blue Spruce problem

My beautiful blue spruce has started turning brown. I don't know why. I've added some pics to see if anyone can help. There are a few white spots on one branch and the needles are going brown? It's sticky, I can't see any resin or anything. 






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I had a similar problem last year. Mine was infested with spider mites that like to feed on the previous years blue foliage. Ended up spraying with a pesticide and then used the the strongest hose setting to knock them off. Literally hundreds dropped off.