If you’re noticing brown patches, fading grass or strange rings on your lawn, your turf might be suffering from disease. These issues are common on the Central Coast due to its warm, humid climate, but with the right knowledge, they’re also preventable and treatable. Let’s break down how you can tackle common grass diseases on the Central Coast—and keep your lawn lush and vibrant year-round.
What Causes Lawn Diseases on the Central Coast?
Grass diseases are usually caused by fungal pathogens that thrive in moisture-rich conditions, especially when combined with poor drainage or overwatering. But it’s not just about the weather. Dull mower blades, over-fertilising, and compacted soil all contribute to turf stress, weakening your lawn’s defences.Pathogens such as Rhizoctonia, Sclerotinia, Pythium, and Gaeumannomyces are frequently reported in Australian lawns according to the Campbell Chemicals Turf Disease Guide, particularly in coastal regions.
Common Grass Diseases in the Region (and What They Look Like)
Straight from the turf science pros, here are the key culprits affecting Central Coast lawns:
1. Dollar Spot (Sclerotinia homeocarpa)
- Appearance: Bleached or tan spots 2–3 cm wide, often sunken. Look for cotton-like fungal threads in the early morning dew.
- Favoured conditions: Humid days, cool nights, and heavy dew.
- Treatment: Fungicides such as Dacogreen®, Ippon®, and Emerald® are commonly recommended.
2. Brown Patch (Rhizoctonia spp)
- Appearance: Circular patches from a few cm to over a metre wide. May have a smoky ring around the outer edge.
- Favoured conditions: Warm, moist weather and compact soil.
- Treatment: Use fungicides like Flowable TMTD® or Ippon®; aerate to reduce soil compaction.
3. Take-All Patch (Gaeumannomyces graminis)
- Appearance: Brown or reddish rings, often killing grass completely. May lead to weed invasion.
- Common in: Bentgrass on poorly drained or high-pH soils.
- Treatment: Apply Tridim® and improve drainage.
4. Pythium Blight (Damping Off)
- Appearance: Water-soaked, greasy patches that rapidly spread. Most aggressive in humid heat.
- Impact: Attacks both mature grass and new seedlings.
- Treatment: Proplant® fungicide provides both prevention and cure.
Preventing Turf Disease: Simple Steps That Go a Long Way
Good turf hygiene and management are your first defence. Here’s what works:
- Aerate annually to prevent waterlogging and root rot.
- Water early in the morning to allow leaf drying and reduce fungal risk.
- Sharpen mower blades to avoid tearing grass, which can invite infection.
- Follow a balanced fertiliser schedule. Overfeeding promotes soft growth that fungi love, and underfeeding weakens the lawn.
Remove excessive thatch, which traps moisture and shelters spores
When starting a new lawn, sourcing high-quality turf from Peats Ridge Turf Supplies gives you a disease-resistant foundation that thrives in local conditions.
Treatment Options: What Really Works?
If your lawn’s already showing symptoms, don’t worry—there are solid treatment routes.
Choose the Right Fungicide
The Campbell guide categorises fungicides into single-site and multi-site types. Multi-site fungicides (like Dacogreen®) are harder for fungi to build resistance against and work best for prevention. Single-site fungicides (like Ippon® or Tridim®) target specific fungus strains and are ideal for curative treatments.
Always rotate fungicide groups to avoid resistance build-up—a key tip from turf management experts.
Apply Correctly
- Always read product labels thoroughly.
- Adjust application rates based on disease pressure and turf type.
Test your water’s pH to avoid fungicide breakdown (known as alkaline hydrolysis).
Spotlight: Fungicide Resistance
Repeated use of the same fungicide group can lead to resistant fungal strains. Two science-backed strategies are mixing a systemic fungicide with a contact fungicide and alternating between resistance groups.
When to Call the Pros?
While many turf issues can be handled DIY, persistent or spreading problems deserve professional attention.
At Peats Ridge Turf Supplies, we don’t just sell turf—we back it up with real support. With over 20 years of experience and a deep understanding of local soil, sun and weather patterns, we can guide you through turf selection, installation and recovery.Whether you’re installing new turf or fixing an old one, get in touch with us today to find out how we can help.
Say Goodbye to Lawn Patches and Hello to Lush Green Turf
Understanding and addressing common grass diseases on the Central Coast doesn’t have to be overwhelming. By recognising symptoms early, using smart turf practices, and applying the right fungicides at the right time, you’ll maintain a lawn that’s as tough as it is beautiful.Need expert advice or premium turf to help your lawn recover?
Contact Peats Ridge Turf Supplies—your local experts in healthy, vibrant lawns.