Organic Grub Control — Lifetime

Best Organic Grub Control: Milky Spore — One Application That Kills Japanese Beetle Grubs for 10–15 Years Buy on Old Cobblers Farm

Updated April 2026 By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Organics Milky Spore

by Wicked Organics — Littleton, NH

—
N-P-K Ratio
"The only grub control product that gets stronger over time instead of wearing off. Milky spore bacteria multiply inside Japanese beetle grubs, killing them and releasing billions of new spores into the soil. One application establishes a living defense that protects your lawn for over a decade."
10–15 yr
Protection Duration
1x
Application Needed
7,000 ft²
Max Coverage
100%
Organic & Non-Toxic
🦠

Living Biological Control

Milky spore is a living bacterium (Paenibacillus popilliae) — not a chemical. It infects Japanese beetle grubs from inside, turning their body fluid milky white as spores multiply, then killing them.

🔄

Self-Perpetuating — Gets Stronger

Each infected grub releases 1–2 billion new spores into the soil when it dies. The spore population grows with each generation of grubs — control improves year after year.

⏳

10–15 Year Protection

Once established, milky spore populations persist for 10–15 years without reapplication. No other grub control product provides anything close to this duration.

🎯

Targets Only Japanese Beetle Grubs

Milky spore is species-specific — it only infects Japanese beetle larvae. Earthworms, beneficial insects, pets, children, and all other organisms are completely unaffected.

💧

Water In to Activate

Apply and water in within 15 minutes to move spores into the soil profile where grubs feed. Soil temperature of 60–70°F is ideal for fastest establishment.

⚠️

No Chemical Grub Products

Chemical grub killers (like GrubEx) kill the same grubs milky spore needs to multiply. Treat the entire lawn and avoid chemical grub products for milky spore to establish.

✅

100% Organic & Non-Toxic

Safe for children, pets, wildlife, waterways, and all non-target organisms. No chemicals, no toxins, no environmental concerns. The safest grub control available.

🇺🇸

Trusted by 20,000+ Growers

Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.

Derived FromPaenibacillus popilliae (milky spore bacterium)
Item FormPowder
Release SpeedN/A (biological control)
Application Rate1 tsp every 4 ft in grid pattern (spot) | 10 oz / 2,500 sq ft (broadcast)
MethodApply in grid pattern or broadcast via drop spreader; water in 15 min
FrequencyONE-TIME application (or 3x/year for 2 years for faster establishment)
Sizes10 oz | 20 oz | 40 oz
SupportsLawns, gardens, turf — targets Japanese beetle grubs exclusively
SetupsLawns, garden beds, turf, ornamental beds, orchards
What We Love
✓ 10–15 year grub control from a single application
✓ Self-perpetuating — spore population grows stronger each year
✓ Species-specific — only targets Japanese beetle grubs
✓ 100% organic, non-toxic — safe for kids, pets, and wildlife
✓ No annual reapplication — one-time cost for decade-plus protection
Worth Noting
— Takes 1–3 years to fully establish — not an instant kill
— Only targets Japanese beetle grubs — not effective against other grub species
Buy on Old Cobblers Farm →
Available in 10 oz | 20 oz | 40 oz
Feature Old Cobblers Farm™ Wicked Organics Milky Spore Milky Spore Powder Milky Spore Granule Season Long Grub GrubEx1 Organic Grub Beneficial Nematodes Garden Insect Spray Captain Jack's Grub Control Lawn Restore
NPK Biological Biological Synthetic Synthetic Biological Biological Biological Biological Biological 9-0-2
Phosphorus 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Potassium 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0%
Form Powder
Sizes 10 oz | 20 oz | 40 oz 10 oz, 40 oz 15 lb, 20 lb 10 lb 14.35 lb 10 lb 1 unit 32 oz 32 oz 24 oz 20 lb
Release Speed N/A (biological control)
The Competition

Milky Spore Powder

by St. Gabriel Org
Biological
N-P-K
Sizes10 oz, 40 oz
Price$34.99
OrganicOMRI

Milky Spore Granule

by St. Gabriel Org
Biological
N-P-K
Sizes15 lb, 20 lb
Price$49.99
OrganicNatural

Season Long Grub

by BioAdvanced
Synthetic
N-P-K
Sizes10 lb
Price$29.99
OrganicNo

GrubEx1

by Scotts
Synthetic
N-P-K
Sizes14.35 lb
Price$39.99
OrganicNo

Organic Grub

by grubGONE!
Biological
N-P-K
Sizes10 lb
Price$47.00
OrganicOMRI

Beneficial Nematodes

by NemaSeek
Biological
N-P-K
Sizes1 unit
Price$40.00
OrganicNatural

Garden Insect Spray

by Monterey
Biological
N-P-K
Sizes32 oz
Price$32.59
OrganicOMRI

Captain Jack's

by Bonide
Biological
N-P-K
Sizes32 oz
Price$10.97
OrganicOMRI

Grub Control

by Natria
Biological
N-P-K
Sizes24 oz
Price$12.99
OrganicOMRI

Lawn Restore

by Safer Brand
9-0-2
N-P-K
Sizes20 lb
Price$44.99
OrganicNatural

🦠

Living Biological Control

Milky spore is a living bacterium (Paenibacillus popilliae) — not a chemical. It infects Japanese beetle grubs from inside, turning their body fluid milky white as spores multiply, then killing them.

🔄

Self-Perpetuating — Gets Stronger

Each infected grub releases 1–2 billion new spores into the soil when it dies. The spore population grows with each generation of grubs — control improves year after year.

⏳

10–15 Year Protection

Once established, milky spore populations persist for 10–15 years without reapplication. No other grub control product provides anything close to this duration.

🎯

Targets Only Japanese Beetle Grubs

Milky spore is species-specific — it only infects Japanese beetle larvae. Earthworms, beneficial insects, pets, children, and all other organisms are completely unaffected.

Common Questions