Grubs are a serious threat to any well cared for lawn.
If left unchecked they can devastate large areas as they hatch, feed, and grow over the summer months.
So it’s important to get the best grub killer for lawns at the first sign of trouble.
My recommended choice is Scotts GrubEx1 Season Long Grub Killer.
This popular product kills all common species of white grubs. And stops them coming back for up to 4 months at a time.
The top choices at a glance:
- Scotts GrubEx1 Season Long Grub Killer
- BioAdvanced 24 Hour Grub Killer Plus
- ST GABRIEL ORGANICS 80080-P Milky Spore Grub Control
- Bonide BND60360 Insect & Grub Killer
- Sevin Insect Killer Lawn Granules
- The Andersons Duocide Lawn Insecticide Control
- Merit 0.5 Granular Systemic Insect Control
- Spectracide Triazicide Insect Killer
- Roundup 4385404 Pest Control
- Bayer Season Long Grub Control
All links lead to Amazon, where you can find more information & customer reviews.
The Best Grub Killer For Lawns: Reviews
Scotts GrubEx1 Season Long Grub Killer
This improved formula of Scotts popular GrubEx product can save your lawn from damage by killing grubs while they’re still young.
It takes care of 25% more species than the first version of this product. Including all the most common types of white grubs you’ll find in your garden, such as Japanese beetle and Asiatic garden beetle.
Applying it once in spring or summer is enough to deal with your grub problem and keep it away for 4 months. This is guaranteed by Scotts who offer a money-back policy if it fails to meet expectations.
It’s easy to spread using a broadcast or hand held spreader, with its consistent granule size making for even coverage. Scotts recommends using their own line of spreaders with this product, but any suitable tool should do the job.
BioAdvanced 24 Hour Grub Killer Plus
This product from BioAdvanced (previously called Bayer Advanced) is known for its fast action, killing white grubs on contact within 24 hours.
It’s also versatile. Because as well as grubs, it will help you get rid of ants, crickets, bill bugs, leafhoppers, army worms, cutworms, crane fly larvae, ticks, and several other common types of annoying insects.
The main active ingredient is DYLOX, included in easy to use granules that can be spread using a rotary or drop spreader.
You should look to apply it when you first see signs of grubs to prevent them causing lawn damage. This is usually in the spring or early summer when the grubs first wake up after winter and start to feed near the surface of the soil.
ST GABRIEL ORGANICS 80080-P Milky Spore Grub Control
If you’re looking for an organic way to control Japanese beetle grubs then St. Gabriel Organics Milky Spore is the product for you.
Amazingly, just one application can protect you from grubs for up to 20 years. Apply it to the ground anytime that it’s not frozen.
Milky spore is actually a natural bacteria called Bacillus popilliae. It specifically targets Japanese beetle grubs to use as a host. As the grubs feed they eat the spores. Which then multiply in large quantity, killing the grub after somewhere between 7-21 days.
The decomposition of the dead grub releases the millions of newly produced spores that infect and kill more grubs. It’s a very effective system of control.
It’s easy to spread the granules with a spreader. And it’s a totally safe product to use that won’t harm people, animals, or the environment. And you don’t have to worry about using it near water ways.
Bonide BND60360 Insect & Grub Killer
Bonide insect and grub killer is designed to control insects both above and below ground. With over 40 insect species such as ants, earwigs, fleas, pill bugs, and ticks effectively targeted along with white grubs. But it doesn’t kill useful invertebrates such as earthworms.
It’s fast-acting, with results promised within 24 hours. And controls your grub problem for 3 months at a time.
As well as on your lawn it’s also good for using in other outdoor locations where you find problem insects. Such as around house foundations.
The formula contains 2 main active ingredients:
Imidacloprid is a systemic insecticide that’s taken up by plants into their flowers, stems, leaves, and fruits. It kills insects quickly after they feed.
Lamda-Cyhalothrin is another fast-acting insecticide that kills immediately upon contact.
The product has a wide application window. So unlike many other products, it isn’t so important to put it down at just the right time. Giving you a margin for error while still getting great results.
Sevin Insect Killer Lawn Granules
This fast-acting insect killer also provides protection for up to 3 months, and kills a range of insects including white grubs upon contact.
Spread the granules evenly on the ground using a spreader when you first see signs of grub or insect activity. And then water them in to release the active ingredient and kill grubs wherever they are hiding, above or below the surface.
Once the watered area of granules has dried you can let children and pets back onto the grass.
As well as lawns, you can use it around your home, on ornamental plants, and to keep insects away from your vegetable garden and fruits.
The Andersons Duocide Lawn Insecticide Control
This broad spectrum insecticide combines the chemicals Carbaryl and Bifenthrin for both curative and preventative treatment of lawn infestations.
It’s effective at killing insects above and below the surface of the ground. Including grubs, mole crickets, chinch bugs, fire ants, fleas, and many others listed on the bag.
At the same time, it also feeds your turfgrass and plants with essential nutrients to help them grow. Making it a 2 in 1 lawn care product.
It comes in granule form that’s easy to spread. And it disperses into the soil quickly and easily after you water the treated area.
Merit 0.5 Granular Systemic Insect Control
Both a curative and a preventative insecticide, Merit granules give you long-lasting grub control.
Designed for broadcast application, you can use it on lawns, and around shrubs, ornamentals, flower beds, and trees.
The main active ingredient is imidacloprid, well known for its quick action against almost every species of insect that infests turf. But it also kills bees.
The chemical formula is powerful. And it’s recommended that you don’t exceed more than 80 lbs of Merit per acre of land treated each year.
Spectracide Triazicide Insect Killer
Designed to kill over 260 types of insects and grub worms above and below ground, Spectracide Triazicide gives you up to 3 months of control per application.
Unlike the products listed above, it comes as a concentrate. It’s simple to use, just attach it to your garden hose to dilute and spray it. Start to teat the infested area when you first notice the insects and grubs. It can kill underground insects and those on the surface.
It’s recommended for use on lawns and landscapes, but you can also use it to control insects around vegetable plots, flowers, fruit and nut trees, and shrubs.
Roundup Pest Control
Another dual action formula that takes care of insects and grubs above and below the surface of the ground.
It kills over 100 types of insects on contact. And has a long-lasting effect, continuing to kill for up to 3 months after application. With 1 application often enough to prevent turf damage.
Ideal for use on and around landscaped areas, ornamental gardens, and residential lawns. Just apply the granules with any spreader and then water the treated area.
Bayer Season Long Grub Control 700720A
These easy-to-use granules create a protective zone in your lawn that protects from all types of white grubs for the whole season.
Apply this product when you first notice your grub infestation, when the grubs are young and are near the surface of the soil feeding.
The product also includes a turf revitalizer that improves root mass leading to thick and strong turf.
The 2 in 1 granules consist of a combination of MERIT brand insecticide with a 6-0-1 NPK fertilizer.
Choosing The Best Lawn Grub Killer
With so many different grub killers available on the market, how do you choose the right one?
Here are the most important things to consider when choosing the best grub treatment for lawns:
Grub killers come in 2 different types, granular and liquid.
Granules are very common, and are simple to spread over the affected area with a spreader.
The best grub killers won’t clump together too much, nor be too powdery. So it’s easy to get an even distribution.
You then need to water it so it dissolves into the soil where it can come into contact with the grubs.
Liquid grub killer comes as either a concentrate that you have to dilute before applying, or a ready to use grub spray. Some bottles of concentrate, like the Spectracide Triazide listed above, come with a special attachment to make it easy for you to connect your hose.
Spraying grub worm killer over your grass is quick and easy to do. But can be less precise in getting an even coverage over all areas, so be careful when applying it.
Organic Or Chemical
Many of the best grub killers use chemical insecticides as their main active ingredients.
They are usually very effective and will kill many types of insects and grubs. So they’re good for removing any other insect pests infesting your lawn at the same time as the grubs.
But there are some drawbacks as well.
Firstly, they sometimes kill beneficial organisms, such as earthworms and bees.
And they’re toxic to more than just insects. So you should be careful using them near waterways. And you usually have to wait for the treated area to dry before letting children and pets back onto the grass.
There aren’t many effective organic grub control products. But, if your problem is with Japanese beetle grubs, then it’s worth considering milky spore. This will do the job of protecting your lawn without the need for insecticides.
Grub Killer vs Grub Preventer
Some insecticides kill all insects they come into contact with after they are applied, but only have short term effects. Whereas other pesticides have a residual action that can protect an area for a longer period.
The best grub killers combine both abilities. Giving you quick results killing any bug that’s active in your lawn. And keeping them away for the rest of the season or more.
When & How To Use
Whatever product you choose, it’s important to apply it as soon as you notice signs of grub infestation in order to minimize the damage they do to your lawn.
Most products are only effective if they are applied when the young grubs are actively feeding near the soil’s surface. This is usually sometime in the summer, with the first week in August being a common time to attempt control. But it can vary with region and product.
As the grubs grow bigger and temperatures start to drop later in the fall in September they dig deeper into the soil where they are harder to kill.
And if you apply the pesticide too early in the year then it starts to break down before the grub eggs have had a chance to hatch.
After applying granules to the ground remember to water the area sufficiently for them to completely dissolve into the soil.
When used according to instructions, insecticides are not a concern for health. But you do still have to be careful. In order for the area to be child and pet safe, you should wait for it to dry before you allow them back into your yard.
It’s also best not to use them when it’s windy. Particularly with a spray, as it will drift into areas you don’t want to treat.
Monitor For Lawn Grubs
If you think you may have a grub problem, it’s worth checking in spring to get an idea of their number.
Cut through your grass with a shovel or spade and roll back the turf so you can examine the root area. Count how many you can find in 1 sq. ft. Repeat this method several times in different locations and take an average.
If it’s less than 6 per sq. ft. then it’s unlikely you’ll have a major problem later in the summer. If the number is around 6 or over, then keep an eye on the situation and be prepared to take action.
If you see signs of grub activity, such as Japanese beetle grub, curl grub, army grub, or chafer grub, it’s a good idea to take quick action. Not only will the grubs cause damage, leaving large brown patches of dying grass, but they also attract animals like moles, raccoons, and skunks, that will tear up your lawn to feed on them.
So, what is the best grub killer for lawns on the market?
My best rated choice is Scotts GrubEx1 Season Long Grub Killer. These easy to spread granules are quick-acting, highly effective, and give protection for up to 4 months at a time.