I planted three Blue Spruce two years ago and they have been doing very well untill this year. Approx. a month ago I noticed the needles turning brown. I have included two pixs, I can't tell if the needles are being eaten or if the bumps are a growth. I did find three caterpillars on one of the trees this evening. Any comments would be appreciated as I am new at this and don't know where to start.