My family has a Frasier fir live Christmas tree in our house right now, and today we noticed that all over some of the branches there is this white webbing. It's not really like spider silk, it's kind of curly and not sticky. I don't see any significant damage to the tree anywhere, although some of the needles on the affected branches have brown spots on the bottoms, nor do I see any insects or evidence of insects, but this is definitely silk and not mold. It almost reminds me of caterpillar silk, like the waxworms leave in beehives. I tried googling, but didn't come up with anything that matches what I'm seeing. Anyone have any ideas?