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Lawn Grubs: The Sunny Coast & Brisbane's Not-So-Sunny Secret

Updated: Mar 19

Living in paradise often comes with hidden pests, and for lawn-loving residents of the Sunshine Coast and Brisbane, lawn grubs are a common foe. These squirming culprits can turn emerald greens into patchy brown nightmares, leaving you wondering what went wrong. But fear not, green guardians! This blog post will arm you with the knowledge to combat these subterranean saboteurs and keep your lawn lush and beautiful.

The Grubby Gang of Grubs:

Lawn grubs are the larvae of various beetles, like the dreaded African black beetle. Their lifecycle is a cycle of sunshine and destruction:

  • Spring/Summer: Adult beetles emerge from the soil, mate, and lay eggs in the lawn.

  • Summer/Autumn: Eggs hatch into white, c-shaped grubs that munch on grass roots, leaving brown patches and spongy turf.

  • Autumn/Winter: Grubs grow larger, feeding heavily until eventually pupating and transforming into beetles.

Grubbing Season:

These ravenous rascals are most active during warmer months, November to May being their prime feasting time. Wet weather is a grubby green light, as moisture encourages breeding and egg-laying. So, keep an extra eye out after summer rains. Also look for cocoon under your eaves, patio roof or external surfaces.

Grub-Busting Battle Plans:

The best defense is a good offense! Here's how to outsmart the grubs:


  • Natural predators: Encourage birds and other critters that feast on grubs, like beetles and earthworms.

  • Watering wisely: Don't overwater, as moisture attracts egg-laying beetles.

  • Fertilize correctly: Avoid excess nitrogen, as it attracts adult beetles.


  • Soap test: A simple DIY trick! Mix dishwashing liquid with water and pour on a small area. Grubs fleeing the sudsy surface confirm their presence.

  • Chemical control: If infestation is severe, consider insecticides. Popular options include Acelepryn and Bifentherin. Choose carefully based on the type of grub and follow instructions precisely. Remember, chemicals can harm beneficial insects, so use them judiciously.

  • One option for spraying is Grub Killa's Active Ingredient:

  • Bifenthrin: This powerful insecticide effectively targets and kills lawn grubs at various stages of their lifecycle, from eggs to larvae.

  • Less toxic to birds and mammals: Compared to other insecticides, Grub Killa boasts lower toxicity levels for birds and mammals, making it a safer choice for lawns frequented by pets or visited by birds.

  • Late afternoon/evening application: As you mentioned, spraying in the late afternoon or evening hours is ideal. This coincides with the grubs' increased activity at night, maximizing the insecticide's reach.

  • Double dose for lifecycle disruption: A second application 7-10 days after the initial spray is recommended to effectively target newly hatched grubs and break their lifecycle.

  • Weather considerations: Avoid spraying if rain is likely in the forecast. Rain can wash away the insecticide, reducing its effectiveness.

  • Label is key: Always prioritize reading and following the instructions on the Grub Killa label for safe and accurate application rates.

  • Fertilizing brown patches after treatment is a great way to promote recovery and encourage new grass growth. Choose a fertilizer suitable for your lawn type and apply according to the manufacturer's recommendations.

  • You can prevent lawn grubs attacking by using a product called Acelepryn GR. Acelepryn GR gives unmatched season-long grub control against a wide range of insect pests including African Black Beetle, Argentinian Scarab, Billbugs and several species of caterpillars including Cutworm, Sod Webworm and Lawn Armyworms.


  • Timing is key: Treat before winter, ideally late summer or early autumn, to target grubs before they reach peak size and damage.

  • Seek professional help: If unsure about the type of grub or the best treatment, consult a reputable lawn care company.

By understanding the grubby gang and implementing these strategies, you can keep your Sunshine Coast or Brisbane lawn a haven for green, not grubs. Remember, a healthy lawn is a happy lawn, and a happy lawn makes for a happy you!

Bonus Tip: Check local council websites for information on specific grub species and recommended control methods in your area.

So, go forth and conquer those grubs, fellow lawn warriors! With knowledge and vigilance, your paradise will remain picture-perfect, green and grub-free.

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