Aphids are very common plant pests, and often work in a symbiotic relationship with ants.
A root drench of insecticide to control the grub stage is usually applied in late- June in the Pittsburgh, PA area. In stark contrast, Fall Webworm tents are formed at the branch tips . Poison Ivy click on photo to enlarge Watch for the 3 leaves of this plant for identification purposes. We've seen several cases like this in 2001. R. M. Donnan Sawfly Check your Pines carefully in May for these camouflaged invaders.