ANY AND ALL decorative trees in your yard should be netted before the onslaught.
Also, do what you can to protect woody landscape bushes and any flowering plants with branches.
In your area, the gorgeous redbud, dogwood and foxglove will suffer the brunt of their “attack”.
Many will die.
They lay their eggs under the bark, which they slice into with their ovipositor.
For humans, they are a nuisance and for insect-phobes, they are a nightmare.
They will fill the air around you like dragonflies in the swamp...only worse.
At the height of the hatch, they fly everywhere in short bursts and will land on anything at the end of their flight, often humans.
They are fun and I plan on going back to Chicago this summer to enjoy a day among them again.
I have a lot of Redbuds and they have been damaged by the annual infestation but not killed. I hope they feast on English Ivy. That stuff is a plague.
Treat all of your vulnerable trees with a systemic poison. I use implants that are drilled into the cambrium, it makes all leaves and the cambrium poisonous. Eggs hatch and die.