The label is the law. Rates and restrictions below are taken from the product labels listed under Sources. Your product's own label governs; read it before you mix or apply. Mixing calculator · Disclaimer
- Active ingredient
- Trifloxystrobin (CAS 141517-21-7)
- Chemical class
- Oximino-acetate strobilurin; FRAC Group 11 quinone outside inhibitors, which act at complex III of fungal respiration.[2][1]
- Mode of action
- FRAC Group 11: QoI fungicides: quinone outside inhibitors at the cytochrome bc1 complex (oximino-acetates)[2]
- Signal word
- Compass Fungicide: Caution[1]
Rotation rules on the label
On turf, make no more than 2 back-to-back Compass sprays for gray leaf spot and 3 for other diseases, then switch to a fungicide with a different mode of action.[1]
For powdery mildew, downy mildew and botrytis on ornamentals, apply two sprays of a non-strobilurin product between Compass applications. Ornamentals get no more than four foliar sprays per crop cycle for each at-risk disease.[1]
FRAC rates Group 11 as high risk for resistance, with known cross-resistance among all Group 11 fungicides in G143A mutant fungi.[2]
What it does not cover well
The label claims only suppression of dollar spot and says to add a dollar spot fungicide when pressure is high. When Pythium blight is likely, mix in a Pythium fungicide.[1]
Where it is used
Strobilurins work best preventively. Start sprays when weather favors disease, and use the higher rate and shorter interval under heavy disease pressure.[1]
On turf, apply after mowing or let the spray dry completely before you mow. For root and crown diseases, use enough water to reach the crown and upper root zone.[1]
Handlers wear a long-sleeved shirt, long pants, shoes, socks and waterproof chemical-resistant gloves. Greenhouse and nursery workers stay out for a 12-hour restricted-entry interval.[1]
Don't run it through irrigation systems or apply it by air. Skip organosilicone additives, which the label says may injure plants.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Compass Fungicide[1] | Environmental Science U.S., LLC | 101563-91 | 50.0% | water-dispersible granule (also in water-soluble packets) | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Compass Fungicide | Golf courses, residential and commercial lawns, sports fields, parks, sod farms | Brown patch, leaf spot, anthracnose, gray leaf spot, red thread, rust, summer patch, fusarium patch, pink snow mold, rapid blight | 0.1–0.25 oz product per 1,000 sq ft[1] Mixed in 1 to 2 gallons of water per 1,000 sq ft. Preventive sprays run 0.1 to 0.2 oz every 14 days for most diseases; curative and longer-interval rates go up to 0.25 oz. Turf is capped at 34.5 oz per acre per year. |
| Compass Fungicide | Ornamentals in landscapes, field nurseries, greenhouses, shadehouses and interiorscapes | Powdery mildew, downy mildew, black spot, leaf spot, rust, anthracnose, botrytis, scab | 1–4 oz product per 100 gallons of water[1] 1 to 2 oz per 100 gallons for mildews; 2 to 4 oz for black spot, leaf spots, rust, anthracnose and botrytis. Spray to the point of drip every 7 to 14 days, and stay under 8 oz per acre per application. |
Safety and environmental hazards
People
Signal word CAUTION: it causes moderate eye irritation and is harmful if absorbed through skin. Prolonged or repeated skin contact may cause allergic reactions in some people.[1]
Pets
For non-farm uses such as lawns, the label says not to enter treated areas without protective clothing until sprays have dried, so keep pets off the grass until then.[1]
Bees and pollinators
The Compass label carries no bee or pollinator hazard statement; its environmental warnings are about fish and water.[1]
Fish and water
Toxic to fish and aquatic invertebrates. Don't apply to water or where surface water is present. The label also warns that some breakdown products could reach ground water under permeable soils with a shallow water table.[1]
Common questions
- How much Compass per 1,000 sq ft for brown patch?
- 0.1 to 0.2 oz every 14 days as a preventive, or 0.15 to 0.25 oz on a 21-day schedule, in 1 to 2 gallons of water.[1]
- Can trifloxystrobin go on home lawns?
- Yes. The label lists residential lawns among its turf sites, though Compass is sold as a professional turf and ornamental product.[1]
- Can I use Compass on vegetable transplants?
- No. The label bars its use for disease control on greenhouse vegetables and on vegetable transplants grown for outdoor planting.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Compass Fungicide label, EPA Reg. No. 101563-91 (EPA-stamped, Mar. 15, 2016).” www3.epa.gov/pesticides/chem_search/ppls/000432-01371-20160315.pdf (accessed 2026-10-06). EPA's site files this label under the product's earlier registration number, 432-1371.
- Fungicide Resistance Action Committee, “FRAC Code List 2025.” www.frac.info/media/ljsi3qrv/frac-code-list-2025.pdf (accessed 2026-10-06)