If each plant has three of these bugs how many are finding mates?

Asked May 11, 2018, 4:18 PM EDT

What are they? Invasive beetles? Each plant has 1 or more looking for a mate. Will neem oil be enough to control them? I want you to tell me they're beneficial, as they are moving through my ornamental shrub and flower beds.

Multnomah County Oregon

2 Responses

The insects in your images have several different common names, among them Hedge-nettle Stink Bug and Happy Bespectacled Stink Bug. (The Latin name is Cosmopepla conspicillaris.) The paired set are a male and female.

Little information is available about them. Thus, I'm unable to suggest how many might result from mating.

During my research, I located one sourcewhere they are listed as potential plant pests. [On page102 in the book "Insects of the Pacific Northwest"] Even so, we seldom receive questions or complaints about them.

See "Stink Bugs of Oregon" for brief text plus images of their eggs and younger stages - http://www.oregon.gov/ODA/shared/Documents/Publications/IPPM/StinkBugGuide.pdf.

If you have only a few, flick them into soapy water where they will drown.

Thanks, Jean! There must be 300 or more and as long as they're not a destructive beetle but a stink bug, I have no worries.