To my mind the best way to reduce Japanese beetles is to reduce the grubs (larvae) they grow from, which live in the soil. When they are adults and eating your roses, however, it’s a little late for that…so knocking them into cans of water to drown them is your best defense. Beetle bags that lure them inside are a disputed "solution" as many people say they just bring more beetles. So for now hand-picking…and planning your attack on the grub population to come. In this post about moles (which feast on the grubs and then become yet another garden pest!) I explain how you can use non-toxic nematodes or other inoculants to reduce your grub population. https://awaytogarden.com/mole-patrol
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.