Control Grass Grub & Porina — Naturally

Support Soil Health. Reduce Pest Pressure. Protect Your Pasture.

Grass grub and porina are two of New Zealand’s most destructive pasture pests.
They attack from below, feeding on the roots and leaves of your pasture — often before you even know they’re there.

The result?

  • Bare patches

  • Lost production

  • Costly regrassing

Our DCT soil conditioning products offer a smarter, more sustainable solution.

The Problem: Silent Damage Below the Surface

Every year, these pests damage hundreds of thousands of hectares of New Zealand pasture.
Many farmers don’t spot the problem until it’s already caused serious loss.

  • Grass grub (Costelytra zealandica) feeds underground on root systems, weakening plants and killing off whole sections of pasture

  • Porina caterpillars feed at night on pasture leaves, creating dead zones and stunting regrowth

  • Both pests thrive in dry, compacted, biologically inactive soils

With the ban on chemical insecticides like chlorpyrifos, farmers are left asking:
“What now?”

The DCT Approach: Better Soil = Fewer Pests

We don't poison pests — we make the soil a place they can’t survive.

Our DCT product is a liquid soil conditioner that transforms your soil biology, structure, and resilience.
It works with nature — not against it — to create conditions where grass grub and porina struggle to establish and survive.

Here’s how:

1. Biological Suppression of Pests

Our product promotes the growth of beneficial microbes, fungi, and bacteria that:

  • Outcompete harmful pest larvae

  • Disrupt grub and porina lifecycles

  • Create a dynamic, oxygen-rich soil environment that pests don’t like

Healthy soil biology adds natural pest pressure — and that means fewer grubs without chemicals.

2. Stronger Roots = More Resilient Pasture

Stronger, deeper roots mean your plants can:

  • Recover faster from pest damage

  • Access more nutrients and moisture

  • Withstand seasonal stress and grazing pressure

Grass grub target weak root systems first — DCT gives your pasture the strength to fight back.

3. Improved Soil Conditions

Grass grub and porina love compacted, dry soils.
DCT-treated paddocks show:

  • Better moisture retention

  • More worm activity

  • Looser, more breathable soil structure

All of this adds up to one thing:
A soil environment pests can’t settle in.

Proven in the Field. Backed by Science.

This isn’t theory — it’s working on real farms across New Zealand.
Farmers using our DCT products report:

✔️ Reduced grass grub pressure
✔️ Stronger bounce-back after porina feeding
✔️ Less need for regrassing
✔️ Better soil and pasture year-round

Scientific studies also support this approach.
For example, published research in New Zealand shows that boosting microbial life in the soil reduces grass grub larval survival, thanks to natural microbial competition and disruption.

What’s It Worth?

Grass grub and porina can cost $200–$500+ per hectare each season — in lost feed, poor regrowth, and regrassing.

Our solution helps:

  • Protect your pasture investment

  • Lower input costs over time

  • Improve whole-system productivity

Easy to Use. Easy to Fit In.

  • Can be applied on its own or alongside fertiliser (e.g. urea)

  • Compatible with biological, regenerative, or organic systems

  • No re-entry intervals. No withholding periods. No soil residue concerns.

Ready to Shift the Balance in Your Favour?

  • If you're tired of chasing pest damage with short-term fixes, it's time to take a smarter, soil-first approach.

    DCT helps you build soil that works for you — not for the pests.

    Contact us today to learn more
    Serving farmers and growers across New Zealand