I've never tried it, but I've read of something you could try. Kind of gross though. Gather a bunch of Japanese beetles and puree them in a blender (preferably an old one) with some water and then strain it after a while and spray it on infected plants. The idea is that some of the beetles will have diseases and this will infect others that ingest the spray.

Or, Gardens Alive has a product called Surround that you spray on plants and it forms a kind of gritty barrier that bugs don't like to eat. Like coating your salad greens with sand. It's made from a white clay that's not harmful to humans--even if you eat it. They also have another product called Pyola that you spray to actually kill the beetles.
It's made from canola oil and pyrethrins (from pyrethrin daisies)

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Terry

May the force be with you

You can also try sitting milk jugs outside around your plants and fill them 1/4 full with a sweet substance that appeals to plant munching bugs. It works for me, but I would also suggest spraying something on the plant to stop the munching. The clay thing sounds good and less gross than the puree bug thing.

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Rule like a Goddess.
Command like a queen.
Work like a slave.

Yep! That'd be what I did alright!

Those nasty things are driving me crazy!
(And I don't need anymore "crazy"!)

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Buckle up! It makes it harder for the aliens to suck you out of your car!

I ended up using 7 dust on my rose bushes. It rained. I went out today and one of my rosebushes is striped bare. Those beetles are awful.

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http://www.picturetrail.com/bestofour

We used the bags at our other house and I do think it attracted more beetles. We had a river birch tree right in front of our house and it was a constant fight to keep those awful things off.

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http://www.picturetrail.com/bestofour