You must live in the country too!!!
We get them by the thousands and last year we decided to try a new technique.
For about 2 weeks when they just started coming out and "grouping" in those big bunches...we shop-vac'd them up and eliminated them.
We found they were much reduced in number the rest of the year...even again in the fall when that starts all over again.
And there were no eggs laid in our window screens this year either!!!
It was a bit time consuming but at least you could sit outside without being ladybug'd.
Good Luck!