Swarming yellow insects hovering over lawns in July are golden digger wasps—solitary, non-aggressive, and beneficial. They paralyze lawn insects (grubs, caterpillars) to provision underground nests for their young.
Another species (Scoliidae) targets June beetle grubs. They’re blue-black, ½–¾ inch, with yellow abdominal spots. Their “mating dance” flights look intimidating but they rarely sting.
Both species reduce pest populations naturally. Enjoy watching them work.

Digger wasps are allies, not threats.
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