Magpie looking for grubs

Lawn grubs – How to look out for and treat lawn grubs

Lawn grubs love the warm weather, and the recent heat has seen them out in force. Most active in South East Queensland from October till May but found year round, it’s important to stay especially vigilant any time the weather warms up.

Signs of a lawn grubs

Signs to look out for
Signs to look out for

Patchy lawns with brown or bare patches are the tell-tale signs of a lawn grub infestation. Other signs to keep an eye out for include white moths flying around as the sun goes down, white egg sacs on your house (eaves, fences, foliage, and furniture) as well as an increase in lawn grub predators such as birds or orange/black wasps.

Preferring a healthy lawn, lawn grubs are far more likely to attack a well maintained lawn. This goes double for all forms of couch grass as they are more prone to infestation. While Sir Walter DNA Certified is more resilient to these pests and usually recovers quicker; it is still susceptible to attack.

Treating a lawn grub invasion

Products to kill lawn grubs
Products to kill lawn grubs

A chemical free way to rid yourself of lawn grubs is to put a wet hessian bag over the affected area of your lawn. The grubs will attach themselves to the hessian overnight and you can then dispose of the grubs first thing in the morning.

The more thorough method for you can use a chemical like Grub Killa. With the active ingredient Bifenthrin this product is toxic to most insects but less toxic to birds and of minimal toxicity to mammals. This makes it safer than many other pest control products.

Treating tips when spraying for lawn grubs

#1. Always spray in the late afternoon/evenings (Kill bugs at night, and weeds in the morning)

#2. Spray a second time 7-10 days later to break the lifecycle

#3. Don’t spray if rain is likely as you will only need to reapply

#4. Always read the label and follow label rates for application

#5. After treatment give any brown patches a hit with fertiliser to bring them back to life

Prevention from future attacks

Lawn grub protection
Lawn grub protection

While products like Grub Killa will kill grubs that are currently in your lawn, there is no residual effect so there is no ongoing protection. You can prevent lawn grubs attacking by using a product called Acelepryn. This product is only sold in commercial quantities so it is best to contact a local lawn care professional to spray this for you. Acelepryn controls a wide range of insect pests including African Black Beetle, Argentinian Scarab, Billbugs and several species of caterpillars including Cutworm, Sod Webworm and Lawn Armyworm.

It is also unique in that it can be used as a preventative measure, up to 6 months protection from every application. This means you can get year round protection from just 2 applications. This is a great solution for people with regular lawn grub invasions.

We have a great video explaining exactly how to use Acelepryn GR which is available from our lawn care store.

To get some more advice lawn grubs or to purchase a new lawn call our team on (07) 3114 8230. You can also to pop in and order in person at our sales office on 1/243 Bradman Street, Acacia Ridge. The office opens Monday to Friday 7am to 5pm and Saturday 7am to 12pm.

For more great turf, tips keep an eye on our website and all our social media channels.


  1. David Rapaport

    What quantity and how much is ACELEPRYN please

    1. Shane Bridges

      $135 for a 10kg bag which will cover up to 1000m².

      It is currently out of stock, but in a week or so when we get more stock in it will be available in our online lawn care store.

  2. What about harm or poison to dogs and puppies


    1. Shane Bridges

      Hi Joan, Acelepryn is completely safe for pets. It targets a function inside insects that mammals, birds and fish don’t have.

  3. Hi instructions for caterpillars say delay watering/mowing for 24 hours. Does that mean you water in after 24 hours, or do you not need to water in at all?

    1. Shane Bridges

      Hi Richie, you still need to water it in to apply the product.

      That instruction on the label refers to further irritation after you have watered it in.

  4. When you say water in, could you advise how much water should be applied or is the mix of the poison with the water spray sufficient?

    1. Shane Bridges

      The granular form requires 6mm of irrigation, the liquid form requires less so around 3mm would be fine. The water is required to help move the product to the roo structure for it to be taken up by the plant.

  5. Cathy Carr

    I have these millions wasp like insects flying over the lawn they have a needle at the back and have been told they are linked with the lawn grub witch I know I have .

    1. Shane Bridges

      The definitely sounds like the wasp that is a common sign of lawn grub. Many people see the wasp before the grub so it is usually used as an early warning sign.

      1. Does it matter what season to spray for lawn grub? Or is anytime of the year fine.

        1. Shane Bridges

          We recommend applying Acelepryn around August and then again in January.

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