Pine Sawfly Larvae Swallow Mugo Pine

Along with exuberant vegetative growth here this spring, seems the insect growth is just as intense. There are always larvae on these ornamental pines, but I've never seen so many colonies as this year. The little video isn't great quality, but look closely and you'll see how their movements are perfectly synchronized and the little green worms first stand up, then lay flat, sort of like the pine needles...amazing!