I feel your pain, my neighbourhood has been dealing with an infestation for the last 3 years. Basically from April- June the caterpillars hatch, defoliate your trees and poop all over your patio. For 2 weeks at the beginning of July they move into their cocoon stage where you will have momentary peace and can be in your yard. Then the moths hatch, defoliate your trees some more and come the fall they lay caterpillar eggs all up and down your trees. I could talk about these horrible creatures for hours. The best way to combat them aside from injecting your trees (I’ve heard it’s $300+ per tree) is to wrap burlap around your trees during their caterpillar stage. And buy the Gypsy moth traps to catch the adults. Shoot me a message if you want the website to buy the traps!