We had a LOT of them move into a line of drift roses this year. I made daily raids and just crushed them by the hands-full (wearing gloves of course) and dumping them on the ground. Birds cleaned them up. In a few days, I found an enterprising female house sparrow would fly in, land on the blooms and prey on the beetles. I saw this activity for a few weeks. My raids killed them in the hundreds each time. Policed by the sparrow, I made fewer and fewer raids. Now I'm hard pressed to find any. My raiding technique seems to be turning the tide for squash bugs as well! With those, I water with the shower setting making sure to get the base of the growing stem. Then I spray as much leaf underside as possible. This triggers adults and larvae to crawl up the leaf stems. As they do so, I snatch them up. I also crush the egg masses when I see them. Doing OK so far...they are still there...just not many.
