While we didn’t find a lot of information for this species, the Green Stink Bug is part of the larger group of stink bugs (Pentatomidae), a family that can produce a strong, foul odor from glands on their sides. All but the most desperate predators would find them unpalatable. Humans occasionally have run-ins too. We came across a photo of Chlorochroa granulosa on BugGuide submitted by Lynette Elliott from Thompson Falls that included the following description, “This stink bug flew up and landed on me. I put it in my hand and it immediately sprayed me with its sour apple smelling stink spray. I still have a mustard colored stain on my hand today, May 20, where the spray landed. The stink bugs in NC never sprayed me, but these in MT seem quick to do so.”
The majority of stink bugs, including this genus, are herbivores, and some are pests of crops and ornamental plants. Others prey on insects (subfamily Asopinae). Adults usually overwinter under ground cover or leaf litter, with females laying their barrel-shaped eggs on the underside of leaves in clusters with tight rows typically in the spring. This species ranges from Colorado west to Nevada and north to western Montana, Idaho, Washington and Alberta, Canada.
Size: About 3/4 of an inch
Photo by: Glenn Marangelo on 5/22/22 near Missoula, MT