Flatids often produce waxy substance as feeding on plants.  Nymphs are settled on stem amongst the waxy substance.

Side view of some nymphs feeding.

Close-up of a nymph settled on the twig.

Nymphs without the waxy around them.  This and previous pictures of the flatids were provided by:  Brian A. Kunkel, University of Delaware, Ornamentals IPM Extension Specialist

Adult flatid.  Photo provided by:  David Cappaert, Michigan State University, Bugwood.org