A lush, green lawn is the pride of any Australian garden, but lawn diseases can quickly turn a healthy turf into a patchy, discoloured mess. Whether you’re dealing with fungal infections, nutrient deficiencies, or pest-related damage, early identification and proper treatment are key to restoring your lawn’s health.
In this guide, we’ll explore:
Introduction to Lawn Diseases
Lawn diseases are typically caused by fungi, bacteria, or environmental stressors such as excessive moisture, poor soil conditions, or incorrect mowing techniques. In Australia, the warm and humid climate in many regions creates the perfect breeding ground for fungal infections.
Understanding the signs of lawn diseases early can save you time, money, and effort in the long run. Let’s dive into the most common lawn diseases you might encounter.
Common Lawn Diseases in Australia
1. Brown Patch
Caused by: Rhizoctonia solani
Appearance: Circular brown or yellow patches, often with a darker outer ring.
Conditions Favouring Growth: Humid weather, overwatering, and excessive nitrogen fertiliser.
Brown patch is a common fungal disease that affects warm-season grasses like Buffalo, Kikuyu, and Couch. It thrives in moist conditions, so reducing evening watering can help prevent it.
2. Dollar Spot
Caused by: Sclerotinia homoeocarpa
Appearance: Small, silver-dollar-sized bleached spots that merge into larger patches.
Conditions Favouring Growth: Low nitrogen levels, morning dew, and drought stress.
Dollar spot is common in Zoysia and Bentgrass lawns. Regular fertilisation and proper irrigation can keep this disease at bay.
3. Fusarium Patch (Snow Mould)
Caused by: Microdochium nivale
Appearance: Orange or brown circular patches with a slimy texture.
Conditions Favouring Growth: Cool, wet weather and poor drainage.
Despite its name, snow mould can appear in cooler Australian regions. Improving soil drainage and aerating the lawn can help prevent it.
4. Rust Disease
Caused by: Puccinia spp.
Appearance: Yellow-orange powdery spores on grass blades.
Conditions Favouring Growth: High humidity and low nitrogen levels.
Rust disease weakens grass, making it more susceptible to other issues. Regular mowing and balanced fertilisation can control its spread.
5. Fairy Rings
Caused by: Various fungi, including Marasmius oreades
Appearance: Dark green rings with mushrooms or dead grass inside.
Conditions Favouring Growth: Thatch buildup and organic matter decomposition.
Fairy rings are tricky to eliminate, but aerating and applying wetting agents can reduce their impact.
6. Pythium Blight
Caused by: Pythium spp.
Appearance: Greasy, water-soaked patches that turn brown and matted.
Conditions Favouring Growth: Hot, humid weather and poor drainage.
Pythium blight spreads quickly, so early fungicide treatment is crucial.
How to Identify Lawn Diseases
Before treating any lawn disease, correct identification is essential. Here’s what to look for:
Discolouration: Yellow, brown, or orange patches.
Texture Changes: Slimy, powdery, or matted grass.
Patterns: Circular patches, rings, or irregular spots.
Growth Abnormalities: Stunted growth or thinning turf.
If unsure, take a sample to a local nursery or lawn care expert for diagnosis.
Effective Treatment Methods
1. Cultural Practices
Improve Drainage: Aerate compacted soil to prevent waterlogging.
Adjust Watering: Water deeply but infrequently, preferably in the morning.
Mow Correctly: Keep grass at the recommended height for its species.
Remove Thatch: Dethatch annually to reduce fungal habitats.
2. Chemical Treatments (Fungicides)
For severe infections, fungicides like Azoxystrobin or Propiconazole can be effective. Always follow label instructions and apply during cooler parts of the day.
3. Natural Remedies
Neem Oil: Acts as a natural fungicide.
Baking Soda Spray: Helps control mild fungal growth.
Compost Tea: Boosts soil microbes to fight disease.
Preventing Lawn Diseases
Prevention is always better than cure. Follow these tips:
- Test Soil Regularly – Ensure proper pH and nutrient balance.
- Use Slow-Release Fertiliser – Avoid excessive nitrogen.
- Rotate Fungicides – Prevent resistance in fungal strains.
- Choose Resistant Grass Varieties – Some turf types are less prone to disease.
When to Call a Professional
If lawn diseases persist despite treatment, consult a turf specialist for further guidance. They can diagnose complex issues and recommend professional-grade solutions.
Final Tips for a Healthy Lawn
Monitor regularly for early signs of disease.
Maintain good lawn hygiene by removing clippings from infected areas.
Avoid over-fertilising, as excess nutrients can promote fungal growth.
Get the Best Lawn Care Supplies at Garden Nursery Products
Keeping your lawn healthy requires the right tools and treatments. At Garden Nursery Products, your trusted Gold Coast garden supply store, we stock everything you need to combat lawn diseases from high-quality fungicides and soil conditioners to professional-grade fertilisers and landscaping tools.
Our experts can recommend the best solutions for your lawn. Visit us today or check out our online store for all your gardening, pest control, and landscaping needs!
