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Japanese Beetle Control: Synthetic Pyrethroids Outperform Sevin

University of Kentucky study found synthetic pyrethroids (deltamethrin, bifenthrin, lambda-cyhalothrin, cyfluthrin) provide 19+ days residual protection vs. Sevin. Some organic products work but may damage foliage.

See UK PowerPoint and PDF: "Residual and Antifeedant Activity of Landscape Insecticides Against Japanese Beetles."

About Gardening: Chemical Control of Japanese Knotweed: What Works (and What Doesn’t); Japanese Beetle Control: Strategies for a Destructive Pest; How to Control Japanese Beetles: Organic Strategies for a Pesky Pest; Japanese Beetle Decline Linked to Dry Summer; Controlling Daisy Beetles on Coneflowers and Black-Eyed Susans; Milky Spore for Japanese Beetle Grubs: Why It's Not a Silver Bullet; Organic Japanese Beetle Control: Soap, Pyrethrin, and Realistic Expectations; Chemical Control for Japanese Beetles: When Hand-Picking Isn't Enough; Japanese Beetle Control on Peach Trees: Realistic Options; Using Beneficial Nematodes to Control Japanese Beetles: What You Need to Know

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