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A bug I believe to be Lyctocoris campestris. #836832

Asked June 21, 2023, 1:07 PM EDT

Somewhat inundated by a bug I believe to be Lyctocoris campestris. We have not had this issue in previous years. What is it? Where did it come from? Do we need to be concerned about it/ does it cause damage? If possible, I will attach a picture.

Mesa County Colorado

Expert Response

Hi Ted,

The insect in your picture is an Elm Seed Bug (Arocatus melanocephalus). These insects have been a common invasive pest on the West Slope since it's detection in 2017. They feed on the seeds of elm trees, and sometimes linden and oak tree seeds. 

They can't survive or reproduce inside the home. They don't cause any damage and are generally harmless, but they can be a nuisance in high numbers. The most effective tactic is to reduce entry points into your home. Seal up cracks and crevices. Add weather stripping to your doors. Repair screens, etc. 

They are so widespread that removing the nearby elm tree will likely not help. You could try try perimeter sprays around structures. More info on elm seed bugs and management in this fact sheet: https://extension.colostate.edu/docs/pubs/insect/05619.pdf

Let me know if you have additional questions! 

Thanks,

Lisa

Lisa Mason
Horticulture Specialist and Entomologist
Colorado State University Extension
An Ask Extension Expert Replied June 22, 2023, 12:15 PM EDT
Thanks!

On Jun 22, 2023, at 10:15 AM, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied June 22, 2023, 2:36 PM EDT

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