Back in the Olden Days, we had pretty simple, but also pretty effective japanese beetle traps. We hung a half-dozen of those ordinary sticky fly ribbons with some rose leaves or blackberry leaves stuck to them in places all along the sticky extruded strip.
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We hung them along a row string over the tops of the beetles' fave plants.
Dunno if they are even made anymore, but they were ubiquitous in the 40's and 50's. They looked sorta like a roll of quarters (unopened) when you bought them. They cost 8c a pack IIRC. <-- Us kids loved to walk the two miles to Miz Gaddis' General Store, because that meant we got the 2c left over from the dime. You got 4 Mary Janes (peany-booger and molasses taffy bites) for 2c.
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HO-lee *****!! I just went searching and found them (see pic above)... But the fargin things no longer sell for 8c a pack. The price is now $6.40!!!