How Long Do Lawn Grubs Take To Die? (Find OUT)

Lawn grubs can cause significant damage to your yard, so understanding how long they take to die is crucial for effective lawn care. In this article, we discuss the lifespan of lawn grubs and how to manage them. While addressing grub issues, you might also want to learn about other lawn maintenance techniques.

Our post on what kills grass and weeds fast offers solutions for tackling unwanted vegetation. And for tips on nurturing a lush, green lawn, check out our guide on how to get your grass to grow again.

Understanding the life cycle of lawn grubs is important in controlling their population.
Grubs can cause significant damage to lawns if not treated properly.
Applying grub control products at the right time is crucial for effective treatment.
Natural methods can also be effective in controlling grub populations.
Regular lawn care and maintenance can help prevent grub infestations.

Let’s dive into this post and learn how to effectively manage lawn grubs and maintain a healthy, thriving yard!

What Are Grubs?

If you have ever seen holes in your lawn, it is likely that there are grubs present. Grubs are the larvae of certain beetles and they feed on the roots of grass plants. 

Much like other insects, grub infestations can cause severe damage to your lawn if left untreated and require professional treatment.

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How to Identify Grubs in Your Lawn

Grubs are the larval stage of insects. They look like white, C-shaped and can be up to an inch long. The damage caused by grubs is due to the feeding on the roots of grass. 

Grub damage shows as brown patches on a lawn that would normally be green if it were not for grub infestation. 

There are many different types of insects that can cause grub damage in your lawn; however, Japanese beetle larvae are one of the most common culprits because they feed on over 300 species of plants including grasses, trees and shrubs.

In order to identify grubs in your lawn you need to know what they look like; where they prefer hiding spots during daylight hours; how long it takes them before they pupate into adult beetles (if applicable); what type(s) of insect has been identified as doing most damage so far this year (if applicable); where did you purchase your grass seed?

How Long Do Lawn Grubs Take To Die?

The answer to this question depends on several factors. For example, how long does it take for the lawn grub to ingest enough of the lawn’s soil to become toxic? 

How long does it take for that toxic substance to kill them? And how long does it take for their bodies once they’re dead to decompose in the soil?

These calculations all depend on a number of variables: temperature and humidity, among other things. But here are some general guidelines based on research done by Clemson University Extension:

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How Much Damage Can Grubs Cause?

Grubs, the larvae of certain insects like beetles and moths, can cause significant damage to your lawn. 

You may notice brown patches in your lawn or thinning grass here and there. These are the signs of grub infestation, which can be caused by any number of different insects. 

The most common culprits are white grubs that feed on grass roots (the larval stage of Japanese beetles) or green June beetle grubs that feed on grass blades (the larval stage of masked chafers).

Both types will leave behind a telltale trail through your yard: small piles of dirt that have been pushed up as they tunnel through the soil in search of food. 

If you see these piles all over your yard, there’s a good chance you’ve got some hungry little guys living belowground!

Which Types of Turfgrass Are Most Susceptible to Grub Infestations?

Turfgrass is susceptible to grub infestation regardless of the species or variety. However, some kinds are more vulnerable than others.

Grubs favor cool, moist conditions and are therefore most likely to be found in northern states and along the Pacific Coast, where they can thrive even during dry spells. 

They also tend to prefer sandy soils (where they burrow into) over clay or loamy soil types; in fact, sandy soils are often thought of as ideal for grubs since these areas receive a lot of rainfall each year soil compaction from heavy foot traffic does not affect their ability to burrow beneath your turfgrass surface or disrupts their life cycle at all!

If you’re noticing an increase in damage from lawn grubs despite having healthy grass with good drainage and no known irrigation issues–and especially if you’ve recently applied fertilizer–you may have an infestation problem on your hands!

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How Do You Prevent Grubs from Infesting Your Yard?

You can prevent grubs from infesting your lawn by keeping it healthy and maintaining a healthy soil. You should also use the right insecticides, nematodes, or organic products to kill them if they do appear in your yard.

When and Where Should You Apply Nematodes for Grub Control?

Nematodes are a very effective biological control that can be used to control grubs. They are microscopic worms that feed on grubs, but don’t do any damage to the rest of your lawn’s growing environment.

The best time to apply nematodes is early in the spring when soil temperatures reach about 50 degrees Fahrenheit (10 degrees Celsius). 

The exact timing varies by region, however you’ll need to check with your local extension agency or other resource if you’re unsure of the best time in your area.

Will Moles Stay Away After I Treat for Lawn Grubs?

Moles will not stay away after you treat for grubs. In fact, moles may actually come around more often because they’re attracted to the scent of earthworms and other insects in your lawn. Moles love grubs as a food source and will be thrilled with your efforts to rid your yard of them!

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What Is the Best Time of Year to Apply a Grub Killer on My Lawn?

It’s best to apply a grub killer in the fall, before the ground freezes. Grubs are most active in early spring and late fall, so this is when they’re most likely to take up residence in your lawn.

Fall: In autumn (September and October), you can apply a grub killer that contains imidacloprid. This insecticide works by paralyzing the worms’ nervous system before they feed on grass roots, which kills them over time.

Winter: If you apply a product containing methiocarb (another insecticide) during winter months, it’ll have time to soak into soil before worms emerge from hibernation and start feeding on your grass again next spring or summer season.”We don’t recommend applying any chemical control products during winter months because many insecticides break down under cold temperatures,” says Dr Daugherty.”

This means that their active ingredients won’t be available for effective control of lawn grubs once spring begins.”

Do I Need a Soil Organic Matter Test Before Applying an Insecticide Or Nematode Treatment For Grub Control?

A soil organic matter test is a good idea if you are unsure about the amount of organic matter in your soil. Organic matter can be defined as any material composed of plant or animal origin that has been incorporated into the soil over time. 

Soil organic matter has been shown to play an important role in maintaining a healthy environment for plants, promoting root growth and providing nutrients needed by plants. 

However, too much or too little organic matter can lead to problems with plant growth and health; therefore it is important for homeowners to understand what is considered an acceptable level for their lawns prior to applying either an insecticide (e.g., grub control) or nematode product (e.g., grub control).

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When Can I Overseed After Applying Bayer’s Merit Lawn Insect Killer Granules?

The best time to overseed is when you wait two to four weeks after applying Bayer’s Merit Lawn Insect Killer Granules. 

The reason for this is that the grub larvae are still alive, but they are at the end of their feeding cycle and will soon die off naturally without your help.

If you put seed on top of them, the new grass will grow over them and keep them from dying off in a timely manner.

After waiting several weeks after applying Bayer’s Merit Lawn Insect Killer Granules, you should then water your lawn regularly until it is completely moistened down to a depth of 4 inches (10 cm). 

You can also use an oscillating sprinkler if you don’t want to manually water every day or two.


So if you have been wondering how long do lawn grubs take to die, then now you know. You can also use this information to help decide on whether or not it’s worth treating your yard for grubs before reseeding or just letting nature take its course.

Further Reading

Here are some additional resources for more information on lawn grub control and management:

How to Choose and When to Apply Grub Control Products for Your Lawn: This article from Michigan State University provides valuable information on choosing the right grub control products and applying them at the right time.

How to Get Rid of Grubs: Smith’s Pest Management offers expert advice on how to get rid of grubs and prevent them from damaging your lawn.

How Long Does it Take Grubs to Destroy Your Lawn?: Weed Pro discusses the impact of grubs on your lawn and how long it takes for them to cause damage.


What are lawn grubs?

Lawn grubs are the larvae of various beetle species that feed on grass roots, causing significant damage to lawns.

How can I tell if I have a grub infestation in my lawn?

Signs of a grub infestation include brown patches of grass that can be easily pulled up, as well as the presence of birds, skunks, or raccoons digging in your lawn.

When is the best time to apply grub control products?

The best time to apply grub control products is in the late summer or early fall, before the grubs have a chance to do significant damage to your lawn.

What are some natural methods for controlling lawn grubs?

Some natural methods for controlling lawn grubs include introducing beneficial nematodes, using milky spore, and promoting healthy soil and lawn conditions.

How long does it take for grubs to die after treatment?

The time it takes for grubs to die after treatment depends on the specific product and application method used. Typically, it takes several days to a few weeks for the grubs to die.