My children and I were doing some fall cleanup around our Blue Spruce trees today. When we moved a layer of the organic duff material we found thousands of these tiny grubs in the duff and soil. I am wondering what they are? Are they going to mature into something that will harm my trees or garden next year ( my garden is relatively close to these trees)? And why would there be a hatch of them in November in Northern Colorado (Fort Collins)? Any help or ideas would be greatly appreciated. Thanks!