What is the natural enemy of Japanese Beatles. My Crape Myrtle is being eaten alive!?

I have used Ortho Max, emptied the whole bottle on the Crape Myrtle and they still come. I used the bag with the sent inside to attract them and got so many beatles that I couldn't deal with it. Bags of beatles is not for me. I was told about other chemical remedies, however, I would prefer getting Praying Mantis or something natural to deal with the problem if possible.

Answers:
spray all of your plants with SEVIN (garden center) that is the only thing I have found that works

Other answers:
Finnish Monkees. Belgian Beach Boys. Russian Stones.
Finnish Monkees. Belgian Beach Boys. Russian Stones.
ladybugs will work fine too.
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