Azoxystrobin Fungiside
Azoxystrobin is a systemic fungicide used to control a wide range of plant and lawn diseases. It works by blocking fungal respiration, stopping energy production and preventing the fungus from growing or spreading. Found in products like Scotts DiseaseEx.
Scotts® DiseaseEx™ Lawn Fungicide ⭐ Amazon Top Seller
A fast-acting granular fungicide designed to control common lawn diseases like brown patch, dollar spot, and rust. Ideal for preventative and curative treatment across most turf types.
Check Price on AmazonScotts DiseaseEx (Azoxystrobin) – Best Preventive Option
Scotts DiseaseEx Lawn Fungicide is one of the most widely used azoxystrobin products for homeowners. It’s a granular fungicide designed for easy application and strong preventive disease control.
- Active ingredient: Azoxystrobin (FRAC 11)
- Best for: Brown patch, leaf spot, lawn rust
- Application: Granular – water in after spreading
- Ideal use: Early-season prevention before disease appears
Prevent brown patch, dollar spot, and spring turf diseases with confidence. In Spring 2026, azoxystrobin and propiconazole are your go-to active ingredients for strong, preventive lawn care. Learn which to choose, when to rotate, and how to apply for maximum turf health.
What is the active ingredient in Scotts DiseaseEx?
The active ingredient in Scotts DiseaseEx is azoxystrobin, a systemic fungicide in the QoI (FRAC 11) group. It is primarily used for preventive control of lawn diseases like brown patch, leaf spot, and rust.
Why Azoxystrobin and Propiconazole Matter
As night temperatures climb and humidity rises, lawn fungi wake up fast. These two widely available fungicides offer preventive coverage:
- Azoxystrobin (QoI/Strobilurin, FRAC 11)
- Propiconazole (DMI/Triazole, FRAC 3)
For a full lawn disease prevention strategy, including pre-emergents and seasonal timing, see our complete lawn care guide.
Quick Application Tips for Spring Turf Care
- Fast pick: Granular Azoxystrobin early season, rotate to propiconazole mid-season.
- High disease pressure: Start with propiconazole, follow with azoxystrobin 14–21 days later.
- Warm-season note: Avoid high propiconazole rates during heat; azoxystrobin is gentler.
Azoxystrobin vs Propiconazole: Product Comparison Table
| Attribute | Azoxystrobin (FRAC 11) | Propiconazole (FRAC 3) |
|---|---|---|
| Chemical class | QoI / Strobilurin | DMI / Triazole |
| Best use | Preventive: brown patch, leaf spot, rust, anthracnose; some Pythium activity | Preventive + curative: dollar spot, brown patch, leaf spot, rust, anthracnose |
| Turf safety | Gentle on cool- and warm-season turf | Effective but can stress warm-season turf at high rates/temps |
| Reapply interval | 14–28 days | 14–21 days |
| Resistance risk | Higher (single-site). Rotate FRAC groups | Moderate. Rotate FRAC groups |
| Formats | Granular, Liquid Concentrate | Liquid Concentrate, combos |
| Watering-in | Granular: 0.25–0.5" irrigation; Liquid: leaf dry for foliar, water-in root diseases | Foliar: dry; water-in only if label directs for crown/root |
| Typical homeowner label ranges/1,000 sq ft | 0.38–0.77 fl oz (liquid); bag rate varies | 0.5–1.0 fl oz (liquid) |
Lawn Fungicide Program
- Set-and-forget: Granular azoxystrobin
- Quick curative + preventive: Propiconazole concentrate
- Balanced rotation: App #1 azoxystrobin, App #2 propiconazole 14–21 days later, App #3 azoxystrobin or different FRAC group
Timing by Grass Type and Climate
- Cool-season lawns: Apply when night lows reach 50–60°F; repeat 14–28 days.
- Warm-season lawns: Apply at 60–70°F soils; rotate azoxystrobin → propiconazole; avoid heat spikes.
- Humid subtropics/tropics: Apply before rainy season; shorten intervals during wet spells.
- Temperate/maritime regions: Emphasize dollar spot prevention; rotate FRAC 11 ↔ 3 every 14–21 days.
Rates, Coverage & Cost per 1,000 sq ft (Estimates)
| Product class | Homeowner label range | Est. cost per 1,000 sq ft | Notes |
|---|---|---|---|
| Azoxystrobin liquid | 0.38–0.77 fl oz | $1.50–$4.00 | Strong preventive; rotate FRAC groups |
| Azoxystrobin granular | Follow bag rate | $1.80–$4.50 | Water-in; easy for large lawns |
| Propiconazole liquid | 0.5–1.0 fl oz | $0.80–$2.50 | Curative; monitor warm-season turf |
How to Apply: Granular vs Liquid
Granular Application
- Use a calibrated spreader
- Apply evenly; sweep off hard surfaces
- Irrigate 0.25–0.5" unless label directs otherwise
Liquid Application
- Choose a hose-end sprayer or battery backpack sprayer
- Measure accurately with calibrated cups
- Optional: add non-ionic surfactant if label allows
- Apply to light leaf wetness; water-in only per label
- Use spray indicator dye for visibility
FAQ: Lawn Fungicides
Which is better for brown patch: azoxystrobin or propiconazole?
Azoxystrobin excels for prevention; propiconazole provides early curative action. Rotate to prevent resistance.
Can I tank-mix azoxystrobin and propiconazole?
Homeowner labels vary. If allowed, test in a small jar first; otherwise, rotate applications.
Will propiconazole harm my warm-season lawn?
High rates at high temps may stress bermuda, zoysia, or St. Augustine. Follow label and avoid heat spikes.
Do I need to water-in fungicides?
Granular azoxystrobin requires light irrigation. Liquid foliar sprays should dry on leaves; water-in only if label instructs.
Related Reading
- Best battery-powered backpack sprayers 2026
- Pre-emergent crabgrass preventers
- Grub control for lawns 2026
- Battery lawn dethatchers & scarifiers 2026
Shop the Top Searches
- Azoxystrobin fungicide concentrates
- Azoxystrobin granular lawn fungicides
- Propiconazole 14.3% concentrates
- Hose-end lawn sprayers
Is Scotts DiseaseEx the same as azoxystrobin?
Yes. Scotts DiseaseEx contains azoxystrobin as its active ingredient. It’s a granular formulation designed for easy lawn application and preventive disease control.
What is better: Scotts DiseaseEx or propiconazole?
Scotts DiseaseEx (azoxystrobin) is better for prevention, while propiconazole is stronger for early-stage treatment. Many lawn care programs rotate both for best results.
Pro tip: Calibrate once each spring, record your walking speed and nozzle output, and you’ll nail coverage every time—saving product and preventing streaks.
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