Above picture is of a later instar of the eastern tent caterpillar.  Photo was provided by author imbedded with picture via insect images.org

Photo above is a picture of an early tent formed by eastern tent caterpillars.  A successful non-chemical control strategy is to tear the ‘tent’ or webbing open so natural enemies have access to the caterpillars.  Photo provided by Tracy Wootten, University of Delaware.

Photo above is an egg mass laid by eastern tent caterpillar female moths in late June or July.  A control tactic here is to either prune out the egg mass or scrape the mass off the twig.  Photo provided by Brian Kunkel, University of Delaware