Some wasps lay eggs in the larvae inside the burrowed nests of various tree borer insects with their lengthy ovipositor, and don’t tend to bite humans although they are some of the largest (therefore scariest) wasps.
So one of the jobs they do is keep tree-killing parasitic insect population down. But that’s only a subsection of all wasps.
But the most effective job most wasps or yellowjackets do, is keep me from digging around in old woodpiles and wondering what that hole in the ground is… most of them nest in such conditions.
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