Hello.

To answer your question, that insect is a Three-Lines Potato beetle.  Here is more information on them: https://extension.umn.edu/yard-and-garden-insects/threelined-potato-beetles

The article I provided will help you determine the best way to eliminate the pest.  Please note that the adult beetle that you are seeing is not doing much damage.  The larva eats the leaves.  

Here is more information about ground cherry plants:

https://extension.psu.edu/programs/master-gardener/counties/susquehanna/news/off-the-beaten-path-ground-cherries

Thank you for reaching out to Ask Extension.