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Just reading this makes me sweat. Aren't hornets - and wasps, to a lesser degree - extremely territorial? How do you deal with one when it find its way inside you house? Not to mention, aren't hornets and wasps natural enemies? I imagine you didn't have the two set their nests near your terrace simultaneously ? I can intellectually process all the facts you wrote, but in my dealing with wasps and hornets, I find it h…
Yes, wasps are territorial, but this just means that they will defend their nests at all cost. As long as you do not rock their nest (or otherwise cause strong vibration) or stand directly in their flight path, you are safe. Different nests can be as close as a few meters and their inhabitants will mostly ignore each other. The hornets were about 7 or 8 meters away from the yellow jackets, and I have never seen them…
Seems like you are talking about bombus, not vespa. The worst thing about hornets is that if one insect has bit you somewhere near their nest than you better run as fast as possible from that place because of pheromone mark.