I thought that the June bug grubs were bigger but maybe not. I guess that you have to cut the butt end of the grub off, stand it on end and look at it under a magnifying glass to tell June bugs, Japanese beetles and chafer beetles apart.
If you really want to know for sure, you can do that. I probably would if I had so many of them.
I'll bet that they are Japanese beetles though. There are always lots of them in PA. They just LOVE my beans but I till in the fall and that brings pupa to the surface for birds to eat so that could partially account for why I don't see as many of them. I leave the soil bare for a few days after tilling before applying my straw mulch for the winter.
Do you till your garden or are you no till?
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