Hi Tom, This looks like fall webworm, a native species that is not generally considered a pest. Our hardwood trees and shrubs can handle the slight defoliation caused by this insect with no long-term implications. If the sight of the webbing bugs you, you can physically remove them or use soapy water.

Exotic gypsy moths do not build webs and their life cycle is much earlier. Larvae would be present in April-June with adults present June-August. To learn more about gypsy moth, please visit http://tinyurl.com/ODF-gypsy

Wyatt

Wyatt Williams
Sept. 9, 2016, 8:43 a.m.