No, they are not “army worms.” Those conspicuous white masses of webby material that are seen in the forks of branches of trees are created by the eastern tent caterpillar. Populations of this ...

I could be wrong, but the sack looks like silk rather than hard like wasp nests. We had heaps of these in the trees out back where we grew up.' The hairy caterpillars, also called Processionary ...