Weed Control Gold Coast Lawn Grubs: The Ultimate Guide to Identifying, Treating, and Preventing Infestations

Maintaining a lush, healthy lawn is a point of pride for many homeowners. However, the presence of lawn grubs can quickly turn a beautiful lawn into a patchy, brown mess. In this comprehensive guide, we will explore everything you need to know about lawn grubs, including how to identify them, treat infestations, and prevent future outbreaks. By the end of this article, you’ll be equipped with the knowledge and tools to keep your lawn grub-free and thriving.

French Bulldog eating a lush lawn that may contain lawn grubs

Section 1: Understanding Lawn Grubs

What Are Lawn Grubs?

Lawn grubs refer to a variety of insect larvae that can wreak havoc on your turf. These include scarab grubs, mealybugs, armyworms, and African black beetles (also a scarab), among others. These creatures feed on the root system of your lawn, depriving the grass of essential nutrients and causing brown patches to appear.

Signs of Lawn Grub Infestation

It’s crucial to be able to recognize the signs of a lawn grub infestation early on. Look out for the following indicators:

Brown Patches

Grubs feed on the root system, preventing vital nutrients from reaching the turf. As a result, brown patches may start to appear.

Spongy turf

If grubs have attacked the root system of your lawn, the texture of the turf may change. It may feel spongy or bouncy, and you may even be able to peel or roll up large areas of affected turf.

Moth activity

When grubs mature, they transform into moths. These moths lay eggs in your turf, restarting the lawn grub life cycle. If you notice an increased presence of moths hovering above your lawn, it’s a strong indication of a potential lawn grub infestation.

Increased bird activity

Birds are natural predators of  grubs. If you observe a significant increase in bird activity on your lawn, it’s likely that they have detected the presence of grubs and are feeding on them.

A Five Spot Burnet Moth eating lawn grass - Australia

Understanding these signs will help you take swift action to address a lawn grub infestation and prevent further damage to your lawn.

Section 2: Identifying Common Lawn Grubs


Armyworms are a prevalent type of lawn grub found in many residential areas. They are light brown caterpillars with darker brown stripes and can grow up to three centimeters in length. Armyworms tend to blend into the soil and dead patches of your lawn, making them challenging to spot.

Sod Webworms

Sod webworms are another type of lawn grub that can cause significant damage to your turf. They are similar in size and shape to armyworms but have brown heads and a lighter overall color. They often go unnoticed until the damage to your lawn becomes apparent.

Cut Worms

Cut worms share similarities in size and shape with armyworms and may have stripes or spots on their bodies. These larvae are the offspring of harmless moths, such as the Bogong Moth. Despite their harmless adult form, the cut worm larvae can cause extensive damage to your lawn.

Scarab Beetles and Curl Grubs

Scarab beetles and their larvae, known as curl grubs or C-grubs, are another group of lawn grubs to be aware of. These grubs feed on the root system of your lawn and can significantly impact its health. Curl grubs have a soft, C-shaped white body with six legs and can range from 15mm to 60mm in length.

A Starling eating lawn grubs from lawn turf

Section 3: Checking for Lawn Grubs

Visual Inspection

To check for the presence of lawn grubs, perform a visual inspection of your lawn during the early morning or dusk, when grubs are most active. Look for any signs of brown patches, spongy turf, or increased bird activity.

Lawn with brown patches indicating possible lawn grub infestation

Sack Test

Another method to confirm the presence of lawn grubs is to perform the sack test. Place a wet hessian sack or wet carpet on your lawn at night. The following day, turn it over and check if any grubs are attached to it. The presence of grubs under the sack indicates an infestation.

Soapy Water Test

A quick test to determine the presence of lawn grubs involves pouring a bucket of soapy water near the edge of a suspected patch of lawn. Within ten minutes, grubs may come to the surface, providing further evidence of an infestation.

By utilising these methods, you can effectively check for the presence of lawn grubs and take appropriate action.

Section 4: Treating Lawn Grub Infestations

Natural Treatment Options For Lawn Grubs

For small grub populations and environmentally conscious homeowners, natural treatment options can effectively control the problem.

Beneficial Nematodes

Beneficial nematodes are microscopic worms that act as natural predators of lawn grubs. They are safe for humans, pets, and beneficial organisms in the soil. Beneficial nematodes can be purchased online and dispersed in water, which is then sprayed onto the lawn. This method provides a cost-effective and eco-friendly solution to manage lawn grubs.

Neem Oil

Neem oil, an organic pesticide, is another natural alternative for controlling lawn grubs. It can be safely used in your lawn, including vegetable gardens. Apply neem oil at night when surface-dwelling grubs are most active for the best results.

Visual Inspection

To check for the presence of lawn grubs, perform a visual inspection of your lawn during the early morning or dusk, when grubs are most active. Look for any signs of brown patches, spongy turf, or increased bird activity.

Lawn with brown patches indicating possible lawn grub infestation

Chemical Insecticide Treatment Options

If natural methods prove ineffective or if you’re dealing with a severe infestation, chemical insecticides may be necessary. However, it’s crucial to follow the instructions carefully and use personal protective equipment (PPE) during application.

Curative Products

Curative products are designed to treat existing lawn grub problems. They are readily available at garden centers and hardware stores. When using curative products, it’s essential to reapply them after seven to ten days to ensure complete eradication of the grubs.

Preventative Measures

Prevention is key to avoiding future lawn grub infestations. By implementing preventative measures, you can minimize the need for repeated treatments and reduce the use of chemicals on your lawn.

Section 5: Restoring Your Lawn After a Lawn Grub Attack

Once you have successfully treated a lawn grub infestation, it’s time to restore your lawn’s health and appearance. Follow these steps to help your turf recover:

1. Mow the Lawn

Start by mowing the lawn at a shorter length to remove any dead or damaged grass.

2. Add nutrients

Apply organic fertilizers or compost to replenish the soil with essential nutrients. Worm tea, Seasol, or other organic fertilizers can help promote healthy regrowth.

3. Repair damaged areas

If your lawn has severe damage, consider adding organic matter such as compost or topsoil to help restore the affected areas.gth to remove any dead or damaged grass.

4. Regular maintenance

Maintain a regular lawn maintenance routine, including regular mowing and watering, to stimulate growth and keep your lawn healthy.

Mow the lawn to help keep free of lawn grubs

Section 6: Preventing Lawn Grub Infestations

Prevention is always better than cure when it comes to lawn grubs. Follow these preventive measures to minimize the risk of future infestations:

1. Proper lawn care

Maintain proper lawn care practices, including regular mowing, watering, and fertilizing. Avoid overfeeding your lawn with high nitrogen fertilizers during the summer months, as lush turfgrass can attract grubs.

2. Bug Lights

Install bug lights in your outdoor areas. While they won’t prevent grubs from dropping into your lawn, they can help catch moths laying eggs and minimize major outbreaks.

3. Reduce lawn moisture

Grubs thrive in moist soil. Avoid overwatering your lawn and ensure proper drainage to reduce the attractiveness of your turf to grubs.

4. Regular Inspections

Keep an eye on your lawn for any signs of grub activity, such as brown patches or increased bird activity. Early detection can prevent infestations from spreading.

By implementing these preventive measures, you can significantly reduce the risk of lawn grub infestations and maintain a healthy, grub-free lawn.

Man Watering lawn after mowing


Lawn grubs can quickly turn a once beautiful lawn into a patchy, brown mess. By understanding the signs of infestation, identifying common lawn grubs, and taking prompt action, you can effectively treat and prevent lawn grub problems. Whether you choose natural or chemical methods, the key is to act swiftly and consistently. With proper care and preventive measures, you can enjoy a vibrant, healthy lawn free from the terrors of lawn grubs.

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