Grape vines definitely -- I had a volunteer wild grape vine that I decided to let grow on an arch trellis. Ultimately, it wasn't in a good place after all. As it turned out, the cheap Craft Store trellis was unable to support the HUGE mass (it grew like crazy in just one season) and collapsed on its own, so the "design" was abandoned. But BEFORE that happened, the Japanese beetles descended on those grape leaves. I was out there every morning with a plastic grocery bag knocking about 30 beetles into the bag to dispose of. I did get a nice bunch of grape vines to make wreaths with for the holidays out of that though.
In the autumn I treated about 15~20 ft radius around the ill-fated trellis with Milky Spore, and I didn't get an explosion of beetles next summer as I feared. However, I have a vague recollection that someone on the forum said Milky Spore is not entirely environmentally friendly and shouldn't be the first choice in Japanese Beetle control.
Other plants that I've noticed the JAPANESE beetles seem to favor are JAPANESE vegetable crops like Shiso and Edamame, as well as ornamental JAPANESE Cherry and JAPANESE Maple leaves. I guess like any displaced ethnic transplants, they favor their most familiar heritage culinary experience.
Unfortunately, they've adapted to American cuisine and also do like native plants like Evening Primrose.
They also seem to like the Lady's Thumbprint-like wildflower/weed (There are two kinds, one is a Pennsylvania native -- I've yet to properly ID the ones in my garden, though I do know similar plants grow in Japan, commonly called Aka Manma (Red Rice). My mom says the ones in my garden grow too tall to be the Japanese kind....) and on the Nectarine leaves but not Peach.