Rough Stink Bug, Brochymena spp.


This is a quick post! I just wanted to share the stink bug nymph I found over the weekend (Sunday, Sept. 1, 2019). It’s a Rough Stink Bug nymph, in the genus Brochymena. I believe it’s Brochymena quadripustulata, the Four-humped Stink Bug. However, Brochymena sulcata and B. affinis are two other species found in our area so similar, they are difficult to distinguish.

Brochymena quadripustulata nymph

Often Brochymena stink bugs are confused with the Brown Marmorated Stink Bug, Halyomorpha halys. These two species can be distinguished by the teeth on the outer edge of the pronoun found on Brochymena spp. and the lack of white rings on Brochymena spp. antennae. Great diagram here ~ http://www.stopbmsb.org/stink-bug-basics/look-alike-insects/%23nbsb

I’m not certain what the red spot is on the bug in my photo, but curiously, I found another photo on bugguide.net with a similar spot https://bugguide.net/node/view/1596719/bgimage . I wish I’d kept my specimen for further investigation, but let it go after taking a few photos. The quality of the photo when enlarged just isn’t good enough to determine if the spot is a parasite. My first thought was it sure looks like a honey bee varroa mite, but I haven’t found any literature describing mites on stink bugs. For the time being, it’s on my “shelf” of things to figure out.

References/Further Reading

https://webdoc.agsci.colostate.edu/bspm/Hexapoda%20(Insects)/Rough%20Stink%20Bugs.pdf

https://bugguide.net/node/view/156717

https://www.oregon.gov/ODA/shared/Documents/Publications/IPPM/StinkBugGuide.pdf

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