A few years ago we got hit by them really bad so I set up a bug zapper to take care of them and there would literally be a pile 6" acros and 4" high of dead ones in just a day or two.
Anecdote: One summer they were so bad in my mom's garden that I literally had to empty FULL traps (coffee can sized) every day for week, it was straight up biblical...
w. o. w.