Best Grub Killers for Lawns (2026)
White grubs — the larval stage of Japanese beetles, June bugs, and European chafers — are the most destructive lawn pests in America. They feed on grass roots just below the surface, killing turf in irregular brown patches that peel up like carpet. If skunks, raccoons, or birds are tearing up your lawn, they’re digging for grubs.
The key to grub control is timing. Preventive products applied in early summer are far more effective than trying to kill established grubs in fall.
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Signs of Grub Damage
- Brown patches that don’t respond to watering
- Spongy turf that feels loose underfoot
- Turf peels back easily — if you can roll it up like a rug, grubs have eaten the roots
- Animal digging — skunks, raccoons, crows, and starlings feed on grubs
- Increased Japanese beetle or June bug activity in summer (adults = future grubs)
How Many is Too Many?
Pull back a 1-square-foot section of turf in a damaged area. Count the grubs:
- 0–5 per sq ft: Normal, no treatment needed
- 6–9 per sq ft: Borderline — healthy lawns can tolerate this
- 10+ per sq ft: Treatment recommended
Best Preventive Grub Killers (Apply Before Grubs Appear)
Preventive products kill grubs as they hatch in mid-to-late summer, before they cause visible damage. Apply in June or early July.
1. Scotts GrubEx (Chlorantraniliprole) — Best Overall Preventive
GrubEx is the go-to preventive for most homeowners. The active ingredient chlorantraniliprole is highly effective against grubs while being one of the lowest-risk insecticides for bees, earthworms, and other beneficial organisms.
Why it’s our top pick:
- Apply as early as April (longest application window of any grub preventive)
- Season-long control from a single application
- Low toxicity to pollinators — safe to apply even when clover is blooming
- Granular — easy to apply with any lawn spreader
Application: Use your spreader at the correct settings. Water in with 0.5 inches of irrigation within 24 hours.
2. Bayer Season Long Grub Control (Imidacloprid)
Imidacloprid has been the standard grub preventive for 20+ years. It’s highly effective when applied in June–July and watered in promptly.
Why we like it: Proven track record, widely available, affordable.
Important note: Imidacloprid is a neonicotinoid and is toxic to pollinators. Apply in late afternoon when bees are less active, and mow any flowering weeds/clover before application.
3. BioAdvanced 24-Hour Grub Control (Dylox/Trichlorfon)
Despite the name, this also works well as a preventive when applied in June–July. Its fast action makes it versatile for both preventive and curative use.
Best Curative Grub Killers (Kill Active Grubs Now)
If it’s late summer or fall and you already have grub damage, you need a fast-acting curative product. These kill existing grubs within days.
1. Dylox 6.2 (Trichlorfon) — Most Effective Curative
Dylox is the professional’s choice for curative grub control. It kills grubs within 24–48 hours of contact, making it the fastest option available.
Application timing: Apply when grubs are actively feeding (August–October, or April–May for overwintered grubs). Water in immediately with 0.5 inches of irrigation.
2. BioAdvanced 24-Hour Grub Killer Plus
The consumer-friendly version of Dylox. Same active ingredient (trichlorfon), easier to find at home centers, and the granular formula makes application straightforward.
Organic Grub Control
Milky Spore (Paenibacillus popilliae)
Milky spore is a naturally occurring bacterium that specifically targets Japanese beetle grubs. Once established in your soil, it provides control for 10–15 years.
The catch: It only works on Japanese beetle grubs (not June bugs or chafers), takes 2–3 years to fully establish, and requires soil temperatures above 65°F to activate. It’s a long-term investment, not a quick fix.
Beneficial Nematodes (Heterorhabditis bacteriophora)
These microscopic worms seek out and parasitize grubs in the soil. They’re effective against multiple grub species but require specific conditions:
- Soil temperature must be 60–90°F
- Apply in evening (UV kills nematodes)
- Keep soil moist for 2 weeks after application
- Effectiveness varies (50–80% control)
When to Apply: Timing Chart
| Product Type | Best Window | Also Effective |
|---|---|---|
| Chlorantraniliprole (GrubEx) | April–July | — |
| Imidacloprid | June–July | — |
| Dylox (curative) | Aug–Oct | April–May |
| Milky Spore | Aug–Sept | — |
| Nematodes | Aug–Sept | Late May–June |
After Treatment: Repair the Damage
Once grubs are controlled, repair the damaged areas:
- Rake out dead grass and debris
- Loosen soil with a garden rake
- Apply grass seed — see our overseeding guide for best practices
- Top-dress with compost at 1/4 inch
- Keep moist until new grass establishes
For spot repairs, check our bare spot repair guide.
Prevention Is Key
The cheapest and easiest grub strategy is prevention. One bag of GrubEx in spring costs about $30 and prevents thousands of dollars in lawn damage. Add it to your spring lawn care checklist and apply it the same day you fertilize.
A healthy, thick lawn also tolerates more grubs without visible damage. Proper mowing height, fertilization, and watering all contribute to grub resilience.
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Related Reading
- The Complete Spring Lawn Care Checklist
- How to Sharpen Lawn Mower Blades
- Lawn Watering Schedule by Grass Type