this post was submitted on 01 Jul 2024
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Wasps can emit alarm pheromones that inform other wasps that it's in trouble. Smashing it can I think also cause this. https://phys.org/news/2015-12-arms-social-wasps-alarm-pheromones.html
Those are colony insects that have a cooperative survival strategy. Japanese beetles don't do that as far as I'm aware.