black with red edge flat insect

Asked August 28, 2018, 5:48 PM EDT

What is this insect? Is it harmful? Found many on mullein stalk. Control?

Denver County Colorado

1 Response

Good morning and thank you for using the Ask an Expert service.

Your pictures show a specific variety of stink bug nymphs (the juvenile stage) in the Genus: Chlorochroa. You can find additional examples of these bugs here:

And you can learn more about their biology and management here: