Rosa Yoo, a Forest Health Manager for the Department of Conservation and Natural Resources (DCNR), gives an update on the Spongy Moth population in Pennsylvania and what they are doing, in coordination with other agencies, to suppress the Spongy Moth caterpillars that have emerged this spring. 
The goal of the DCNR Spongy Moth suppression program, through ground crew analyzation and aerial spraying, is to minimize defoliation, so trees in the PA Wilds can be healthy and fight stress and disease.

https://www.dcnr.pa.gov/Conservation/ForestsAndTrees/InsectsAndDiseases/SpongyMoth/Pages/default.aspx

https://www.pgc.pa.gov/Wildlife/HabitatManagement/Pages/Spongy-Moth.aspx