Grass Grub Reduction Through Improved Soil Health Case Study
Summary.
Before treatment, large populations of grass grub were present. Over the course of using DCT products, grass grub numbers declined significantly, with remaining grubs found dead and calcified — indicating a sustained reduction in pest pressure.
The Problem.
Grass grub is a major pasture pest that damages roots, reduces pasture persistence, and lowers productivity. Conventional control often relies on chemical inputs, which may provide short-term relief but do not address the underlying soil conditions that allow pests to thrive.
The Result.
Following application of DCT products:
Grass grub populations reduced over time
Remaining grubs were observed dead and calcified
Pasture showed improved resilience and root health
These results indicate that improving soil function can naturally suppress pest populations.
How DCT Products Support Pest Suppression.
Rather than acting as a pesticide, DCT products improve soil conditions so pests struggle to survive.
✔ Enhanced soil biology
Healthy soils support beneficial microbes and predatory organisms that naturally suppress pest populations.
✔ Improved soil structure
Aerated, well-aggregated soils make it harder for grass grub to survive and move through the soil.
✔ Stronger, deeper root systems
Healthier roots are more resilient and less susceptible to damage from soil-dwelling pests.
✔ Balanced soil nutrients
Optimised mineral and nutrient availability supports plant health, making pasture less attractive to pests.
Why This Matters.
By improving soil function, DCT products help shift the system toward a naturally healthier pasture ecosystem — reducing reliance on chemical pest control and supporting long-term pasture performance.
Conclusion.
This case study demonstrates how improving soil biology, structure, and plant health can lead to meaningful reductions in grass grub pressure without relying solely on chemical solutions.
