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Milky spore and grub-ex works on japanese beetles. Kind of. Your average grub is the larvae of a japanese beetle. The grub stuff kills the grubs in the ground before they become the pesky beetle problem.
You dont want it in your garden really, though milky spore wont hurnt anything but grubs.
They do however make japanese beetle traps that are fairly effective to help combat the problem after the grubs have matured.
Rotenone is good. Seven is real good. But seven isnt natural (I dont think)
FOr smaller insects use some kind of organic spray oil. It coats the bugs crawling around in it, which breathe through their "skin", basically it suffocates them.
Thats about all I got.
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