They will eventually turn to moths in and lay egg masses on the primarily on the bases of the trees in early fall. Spray the egg masses with and horticultural oil and it will aid in the them not hatching well next year. For this year not much you can do. Once they hatch and are in the trees they arent going anywhere. Most trees like oaks and maples can handle the defoliation for a couple years without killing the tree and the gypsies seem to peak over a period of 2 years and then begin to taper off through normal cycle I believe. I'm in Rowley and we are year #2 of infestation. You go outside and all you hear is the poop falling from the trees. Sounds like its raining. Basically you wont be hanging your laundry out for a couple summers.
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