I think you can get a powder that kills the beetles before they turn into adults. Milky spore powder/ liquid. It may be too late if they are all adults now. I am guessing at this. Wait for more posts or go to your local home warehouse Lowes/ Home depot or what places you shop at and check out what they have.

You can spray it with Bayer Advanced bug spray, which Wal-mart or Lowe's would have.

I use it on plants to kill off Japanese beetles, a different species from what you're dealing with, but it should still work.

Richard.

Put anything on those bastards you can find. Pronto!

So what exactly are those things?