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Japanese Beetle Grub Control: Timing Halofenozide Applications

Halofenozide (Mach 2, Grub Stop) accelerates molting in young grubs. It’s only effective on first- or second-instar larvae—apply mid-June to mid-July, right after egg hatch. Spring or fall applications miss the vulnerable stage. Grubs from neighboring yards will still fly in, so expect suppression, not eradication.

About Gardening: Japanese Beetle Control: Strategies for a Destructive Pest; Wisteria 'White Japanese' – A Fragrant Climbing Vine for Arbors and Fences; Grub Control: Why Doing Nothing Is Often Best; Yellowmargined Leaf Beetle on Turnips and Collards; Japanese Beetle Decline Linked to Dry Summer; Japanese Beetle Resistant Plants for Southern Landscapes; Grub Control Timing: When to Treat and When to Wait; Green June Beetle Grubs in the Pool: Nightly Invasion; Using Beneficial Nematodes to Control Japanese Beetles: What You Need to Know; Hercules Beetle Grub: Giant Larvae in Compost and Logs

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