Read This First: Who Does What

Chafer beetles (lawn grubs) are a pest control problem and a lawn repair problem:

  • Pest control: choosing and applying a product or method to kill or control lawn grubs

  • Lawn repair: rebuilding the brown, torn-up lawn they leave behind

Aerating Thatching Co does not provide chafer beetle or grub pesticide treatments.
This article explains how homeowners or pest control companies typically get rid of chafer beetles, and then shows how Aerating Thatching Co can help repair the lawn after the grubs are under control.

Step 1 – How to Tell if You Really Have Lawn Grubs

Before you search “kill lawn grubs” or “best treatment for grubs in lawn,” make sure grubs are actually the problem.

Common signs of grubs in the lawn

  • Brown patches that don’t respond to watering

  • Lawn that peels up like carpet when you tug on it

  • Animals digging: raccoons, skunks, and crows tearing up the lawn

  • White, C-shaped grubs ½–1 inch long in the top 1–2 inches of soil

Quick “how to check for lawn grubs”

  1. Choose the edge of a brown patch.

  2. Cut three sides of a 12″x12″ square of lawn like a flap.

  3. Peel it back carefully.

  4. Count the grubs in the soil under that square.

Finding a few grubs is normal. If you’re seeing a dozen or more per square foot, that’s usually enough to cause serious lawn grubs damage and makes treatment worth considering.

For a deeper explanation of what chafer beetles are and how they damage roots, link to your article: “What Are Chafer Beetles (Lawn Grubs) and How They Damage Seattle Lawns.”

🎥 Watch: Chafer Beetles in Seattle – What’s Really Killing Your Lawn
🔊 Turn your volume up and watch this short video to see how European Chafer beetle grubs destroy lawn roots in Seattle neighborhoods—and what the early warning signs look like.

Step 2 – When to Treat Lawn Grubs in Seattle

Searches like “when to treat lawn grubs” and “when to treat grubs in lawn” are all about timing.

In general:

  • Best time: when young grubs are small and close to the surface

  • For Seattle’s climate, that’s often late summer into early fall, shortly after eggs hatch

  • Some curative products can also be used in spring while grubs are still feeding, before they go deeper or pupate

The exact timing depends on the product label, so always follow label directions and local regulations. Treating too early or too late is one of the biggest reasons “grub treatments” don’t seem to work.

Step 3 – Choose Your Control Approach

Homeowners searching “lawn grubs control,” “how do I get rid of lawn grubs,” “what kills grubs in lawn,” or “chafer beetle control” generally have three options:

Option A – Biological control (beneficial nematodes)

This is the most common “natural” control people look for under phrases like “beneficial nematodes for lawn grubs” and “killing grubs in lawn naturally.”

  • Beneficial nematodes are microscopic worms that seek out and infect grubs in the soil.

  • Sold as a living product that’s mixed with water and applied to the lawn.

  • Works best when:

    • Soil is warm enough (check label)

    • Soil is kept evenly moist before and after application

    • Applied in shade or evening so they aren’t killed by sunlight

Nematodes are slower acting than chemical insecticides but can fit well with an organic or low-chemical strategy.

Option B – Conventional insecticides (DIY products)

Searches like “lawn grubs killer,” “insecticide for grubs in lawn,” “lawn grubs spray,” and “best way to kill grubs in lawn” all point to store-bought products.

Typical points to keep in mind:

  • Different products are labeled for preventive (before grubs are big) vs curative (when damage is already visible) control

  • Many grub killers must be watered in thoroughly to move the active ingredient down to where grubs are feeding

  • Some ingredients are harmful to pollinators if mis-applied, so:

    • Avoid flowering weeds in the lawn at application time

    • Follow all bee and pollinator precautions on the label

  • Keep children and pets off the lawn until the label’s re-entry time has passed

If you’re not comfortable choosing or applying products yourself, it’s worth contacting a licensed pest control or lawn care company that offers grub treatments.

Option C – Professional pest control

For people searching “best treatment for grubs in lawn” or “what kills grubs in lawn quickly,” the most reliable route is often a pest control professional who:

  • Knows which products work best on chafer beetles (not just any grub)

  • Applies them with proper equipment and timing

  • Handles all compliance with Washington State pesticide rules

Important: Aerating Thatching Co does not apply grub control products or pesticides. We recommend talking with your preferred pest control service or local extension resources to choose an appropriate treatment.

Once the chafer beetles (lawn grubs) have been controlled, that’s when we step in to repair the lawn.

Step 4 – After Treatment: Repairing Grub Damage in Your Lawn

Killing the grubs stops new damage, but it doesn’t magically regrow roots that are already gone. That’s why so many search terms like “lawn grubs damage” and “lawn with grubs” are really about recovery, not just control.

After the chafer beetles are under control, you’ll still need to:

  1. Rake up loose, dead lawn where the roots are gone.

  2. Fix low or uneven spots with topsoil or compost.

  3. Overseed or renovate thin areas.

  4. Rebuild soil health so new roots grow deeper and stronger.

This is exactly where Aerating Thatching Co comes in.

How Aerating Thatching Co helps after grub control

Once lawn grubs are handled by you or a pest control company, Aerating Thatching Co can:

  • Rebuild the lawn – core aeration, detaching (power raking), overseeding, fertilizer, and soil amendments to re-establish healthy roots and new grass

  • Time the work to Seattle’s seasons – scheduling repairs when your lawn has the best chance to recover and thicken up

  • Advise whether you need spot repairs, a Lawn Tune Up, or a full lawn renovation if large sections are destroyed

We serve North Seattle, Shoreline, Edmonds, Lake City, and nearby neighborhoods, with a focus on local, non-franchise service.

Quick FAQ: Common “Lawn Grubs” Searches Answered

What causes lawn grubs?

Adult beetles (in our area, mainly European chafer beetles) fly in summer, lay eggs in well-watered lawns, and those eggs hatch into grubs that feed on roots. Thick, irrigated lawns with some thatch are often more attractive to egg-laying beetles.

Are lawn grubs bad?

A few grubs per square foot usually aren’t a problem. High populations, though, can cause serious lawn grubs damage—brown, loose areas that peel back easily and don’t respond to watering.

Are lawn grubs bad for dogs?

The grubs themselves aren’t usually toxic if your dog digs one up and eats it. The bigger concern is any chemical treatments you apply. Always check the product label for pet precautions and keep pets off the lawn until it’s safe to re-enter.

What’s the best treatment for grubs in lawn?

There’s no single “best” product for everyone. For many homeowners it comes down to:

  • Biological (nematodes) if you want a lower-impact, natural approach and can follow the timing and watering requirements

  • Conventional insecticides if you want faster results and are comfortable following label directions

  • Professional pest control if you want someone else to handle product choice and application

No matter which path you choose, remember: once the grubs are controlled, you still need to repair the lawn.

If you’ve treated for chafer beetles or lawn grubs—and now you’re left with a patchy, torn-up lawn—Aerating Thatching Co can help bring it back.

Request a quote from Aerating Thatching Co for a Lawn Tune Up or full lawn renovation. We’ll look at the damage, explain your options, and put together a repair plan so your lawn can recover from grub damage and stay healthier in future seasons.