Lawn Grubs, Curl Grubs & Armyworms Are Devouring Your Grass — Here’s How to Protect Your Lawn Now

Across Australia, lawns are under siege. From Queensland to Victoria, homeowners are waking up to dry, brown patches where lush green grass stood the day before. The culprits? A hidden army of lawn grubs, curl grubs, and armyworms.

These pests feed on lawns with brutal efficiency. By the time signs of infestation appear, much of the damage has already been done. But there is a way to stop them — effectively, affordably, and for the long term.

What Are Lawn Grubs, Curl Grubs & Armyworms?

Let’s clear the confusion. “Lawn grub” is a general term in Australia, often used to describe both the larvae of beetles (like curl grubs) and caterpillars (like armyworms). But they’re very different pests with equally destructive behaviours.

• Curl grubs (white, C-shaped larvae) live beneath the soil, feeding on the roots of the grass, cutting off the plant’s ability to absorb water and nutrients.
• Armyworms are caterpillars that chew through grass blades, leaving widespread surface destruction — sometimes overnight.
• Lawn grubs as a term can refer to both, making it essential to understand what’s attacking your turf.

Why These Lawn Pests Are a 2025 Problem

In 2025, Australian homeowners are facing surging infestations due to a combination of warmer winters, longer humid periods, and increased rainfall. These conditions create the perfect storm for beetles and moths to breed more frequently — and for grub and armyworm populations to spike multiple times a year.

Early Warning Signs of Lawn Grub or Armyworm Infestation

Knowing what to look for — before it’s too late — is crucial. Here are signs your lawn might already be under attack:

• Brown or straw-coloured patches that spread fast
• Spongy feel underfoot (a sign that root systems have been eaten)
• Lawn lifts like carpet – especially common with curl grub infestation
• Birds pecking the lawn – they’re digging for grubs
• Moths flying low over grass around dusk – likely armyworm adults laying eggs

If you notice any of these, your lawn is likely hosting hundreds – even thousands – of lawn-eating insects.

The Lifecycle: Why You Must Act Fast

Curl grubs begin as eggs laid by beetles in the soil. Once hatched, they feed underground for months, killing grass from the roots. Armyworms hatch from eggs laid by moths and begin feeding immediately, often moving in “waves” across lawns.

Because the early stages of damage are hidden, by the time symptoms show, the infestation is well underway. That’s why early, long-term treatment is key.

Why Most Lawn Products Fail

Walk into any hardware store and you’ll see dozens of grub control products. The problem? Most are short-term fixes at best:

• They break down after one rainstorm
• They only kill surface pests
• They require constant re-application every few weeks
• They miss pests hiding in root zones, tree bases, and lawn edges

This isn’t just ineffective — it’s expensive, frustrating, and unsustainable. And frankly, that’s how they’re designed — to keep you buying more.

The Long-Term Solution: Acelepryn GR

There is a better option. Syngenta Acelepryn GR is a professional-grade, granular lawn insecticide used by turf professionals across Australia. It’s now available for home use — and it’s changing the game.

Why Acelepryn GR Works

• One application provides up to 6 months protection
• Kills pests at all life stages — eggs, larvae, adults
• Granular form penetrates deep into soil and hidden breeding zones
• No reapplication after rain
• Safe for pets and children after watering in

What Pests Acelepryn GR Kills

• Armyworm (Spodoptera spp.)
• Curl Grubs (Scarab larvae including African Black Beetle, Argentinian Scarab)
• Cutworms
• Sod Webworms
• Billbugs

How to Apply Acelepryn GR

1. Use a fertiliser spreader to apply 0.75–1.5 kg per 100 m².
2. Water in with 6 mm of irrigation immediately after application.
3. If grubs are actively feeding, do not mow or water for 24 hours after spreading.

Tip: A 10 kg bag treats 665–1,300 m² depending on rate. Go heavier in active outbreaks.

When to Apply (Timing Is Everything)

• Spring: Apply in early spring (August–October) to prevent grub hatchings
• Summer: Apply in mid-summer (December–February) when armyworms are active
• Fall: Apply if damage signs appear or adult beetles are present

Is It Safe?

Yes. Acelepryn GR is classified as Schedule 5 — lower than many supermarket sprays. It doesn’t require gloves or protective gear, and once watered in, it's completely safe for:

• Pets
• Children
• Native wildlife

Who Should Use Acelepryn GR?

This is ideal for:

• Homeowners who value their lawn and want long-term protection
• Families who want a safe, low-tox option for pest control
• Anyone who’s sick of repeat spraying and short-lived results

It’s not for people looking for the absolute cheapest option. Acelepryn GR costs more up front — but saves hundreds over time.

FAQ: Answering What Australians Are Asking in 2025

How long does Acelepryn GR last?

Up to 6 months with one application.

Is it safe for pets and children?

Yes, after watering it in.

Can it revive a lawn that’s already dead?

No. It prevents further damage, but dead turf will need to be replaced.

Can I fertilise after applying?

Yes. Fertilise 3–7 days later to avoid overwatering.

Where can I buy it?

From The Garden Superstore, turf suppliers, or online authorised retailers in Australia.

How It Compares to Other Options

Product	Protection Length	Safe for Pets?	Cost Over 6 Months
Acelepryn GR	6 Months	Yes	$$
Standard spray	2–3 Weeks	No	$$$$
DIY homemade mix	1–2 Days	Sometimes	$$$

Final Thoughts: Stop Reacting, Start Protecting

If you’ve seen birds on your lawn, spotted brown patches, or noticed moths flying at dusk — you’re already at risk. Don’t wait until the damage is visible. With one application, you can stop the cycle, protect your lawn, and avoid re-turfing costs later.

Acelepryn GR is used by the pros because it works. Now homeowners have access to the same powerful solution — with none of the toxic downsides.

Don’t give lawn grubs or armyworms another chance. Take control today — and protect your turf the right way.