Could Grubs Be Damaging Your Lawn? Here's What to Look For

samantha5319
Apr 6
3 min read

A Quick Guide to Grub Damage: How to Spot It, Why It Happens, and How to Fix It

If your lawn isn't looking as full, green, or healthy as it should, you're not alone - and the cause might not be as obvious as you think. One of the most common issues hiding beneath the surface is grub damage. These small, root-feeding larvae quietly weaken your lawn before you even realize there's a problem. The good news is that once you know what to look for, grubs are easy to identify and manage.

In this quick guide, we'll walk you through the signs of grub damage, why it happens, and what you can do to fix it.

What Are Grubs?

Grubs are the larvae of beetles, most commonly Japanese beetles in our area. They live below the surface of your lawn and feed on grassroots. As they feed, they damage the root system that your grass relies on to absorb water and nutrients. Without the strong roots, even a well-maintained lawn can quickly start to decline.

Signs of Grub Damage

Grub damage can sometimes be mistaken for drought stress or general lawn issues, but there are a few key signs to watch for. You may notice brown or patchy areas that don't improve with watering. The turf might feel soft or spongy underfoot, and in more severe cases, the grass can be pulled up easily, almost like rolling back a piece of carpet.

Another major indicator is increased animal activity. If you're seeing raccoons, skunks, or birds digging up your lawn, they're often searching for grubs beneath the surface.

How to Check for Grubs

If you suspect grub activity, there's a simple way to confirm it. Gently pull back a small section of your lawn and inspect the soil just below the surface. If you see white, C-shaped larvae, you likely have grubs.

A small number of grubs is normal, but if you find 5-10 or more per square foot, it's a sign that treatment is needed to prevent further damage.

Why Do Grubs Show Up?

Grubs are a natural part of the environment, and their presence doesn't mean you've done anything wrong. Adult beetles lay their eggs in the soil during the summer, and those eggs hatch into grubs that begin feeding.

Interestingly, healthy, well-watered lawns can actually attract beetles because the soil conditions are ideal for laying eggs. Moist soil and consistent irrigation create the perfect environment for grub development.

When Grubs Cause the Most Damage

Grubs are most destructive in late summer and early fall when they are actively feeding on grassroots. This is typically when homeowners begin to notice visible damage in their lawns.

Because the damage happens below the surface first, it can progress quickly before it becomes obvious above ground.

How to Get Rid of Grubs

The best way to deal with grubs depends on timing and the severity of the issue.

Preventative treatments are applied in late spring to early summer and are the most effective way to stop grubs before they hatch and being feeding. This approach helps protect your lawn before damage ever starts.

If you're already seeing signs of grub activity, curative treatments can be used to target and eliminate active grubs. These treatments are effective, but timing is important to ensure the best results.

How to Help Your Lawn Recover

After grub treatment, your lawn may need some extra care to fully recover. Overseeding can help fill in damaged areas, while fertilization supports new growth and root development. Consistent watering also plays an important role in helping your lawn regain its strength.

With the right combination of treatment and care, most lawns can bounce back and look healthy again.

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