Chlortan
Protectant fungicide (chlorothalonil). Controls Dollar Spot, Brown Patch and Grey Leaf Spot. Single 1L bottle.
See how much Chlortan you'll need
Fungicide & Disease Calculators
Work out exactly how much fungicide you need to treat turf diseases including Dollar Spot, Brown Patch, Anthracnose, Fairy Ring and more. Pick a product below, enter your lawn area, and the calculator does the rest.
Impala
Dual systemic fungicide controlling over 10 turf diseases including Anthracnose, Brown Patch, Dollar Spot, Fusarium, Pythium, Fairy Ring, ERI and Take-all Patch.
See how much Impala you'll need
Tribeca
Dual-action fungicide. Controls leaf and root diseases including Anthracnose, Brown Patch, Dollar Spot, Fusarium, ERI, Spring Dead Spot and Take-all Patch.
See how much Tribeca you'll need
Fungicide Calculator FAQ
When do turf diseases appear?
Most lawn fungal diseases thrive in warm, humid conditions — typically late spring through autumn. Dollar Spot, Brown Patch and Pythium are most common in summer, while Fusarium and Fairy Ring can appear year-round. Watch for circular brown patches, water-soaked lesions, or white/grey fungal growth in the morning dew.
Preventative vs curative application — what's the difference?
Preventative: Apply before disease appears, when conditions favour development (warm, wet weather). Curative: Apply after disease symptoms first appear. Repeat applications every 14–28 days if conditions continue to favour disease.
Should I apply by garden sprayer or watering can?
Either works. Garden sprayer gives more even coverage and is faster for large areas. Watering can is simpler for small treatment areas but uses more water (9L per 10m² vs 5L per 100m²). Always ensure thorough, even coverage.
How long do fungicides last?
Most lawn fungicides give 14–28 days protection per application. Systemic fungicides (Impala, Tribeca) move within the plant and last longer than contact fungicides like Chlortan. Rotate between different active ingredients to prevent resistance.
Do I water in fungicides after applying?
It depends on the disease target. For leaf diseases, let the spray dry on the leaf — don't water in. For root diseases, irrigate within 1 hour of application with about 6mm of water so the product reaches the root zone.