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
- Triticonazole
- Chemical class
- Triazole; FRAC Group 3 DMI fungicides, which inhibit sterol biosynthesis in fungal membranes.[2]
- Mode of action
- FRAC Group 3: DMI fungicides: demethylation inhibitors in sterol biosynthesis (triazoles)[2]
- Signal word
- Triticonazole Concentrate Fungicide (sold as Ortho Disease Control, Ortho Rose & Flower Disease Control, Ortho Lawn Disease Control and other Ortho brands): Caution[1]
Lawn limits
The lawn directions cap use at 120 fl oz of product per 1,000 sq ft per year. The label also claims it suppresses algae growth on lawns.[1]
Where it sits among lawn and garden fungicides
FRAC puts triticonazole in Group 3 with tebuconazole, propiconazole and myclobutanil. It advises assuming cross-resistance among DMIs that act on the same fungus.[2]
Where it is used
Apply as soon as disease shows up, then wait 2 to 4 weeks before reapplying if symptoms come back.[1]
When it's hotter than 85 degrees F, treated grass may yellow temporarily.[1]
Hold the sprayer 8 to 12 inches from plants, and stop once the leaf surface is wet. Stand upwind, and skip spraying when wind tops 10 mph.[1]
Hose-end and Dial 'N Spray applicators are outdoor-only. Houseplants get the 2 fl oz per gallon mix from a tank sprayer.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Triticonazole Concentrate Fungicide (sold as Ortho Disease Control, Ortho Rose & Flower Disease Control, Ortho Lawn Disease Control and other Ortho brands)[1] | The Scotts Company (The Ortho Group) | 239-2700 | 1.0% | ready-to-spray hose-end concentrate and tank-mix concentrate | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Triticonazole Concentrate Fungicide (sold as Ortho Disease Control, Ortho Rose & Flower Disease Control, Ortho Lawn Disease Control and other Ortho brands) | Lawns: bentgrass, bermudagrass, bluegrass, fescue, ryegrass, St. Augustinegrass, zoysiagrass and others | Brown patch, dollar spot, large patch, zoysia patch, red thread, rust, take-all patch, necrotic ring spot, snow molds, leaf spots and others | 2–4 fl oz product per gallon of water per 100 sq ft[1] 2 fl oz for light disease and 4 fl oz for heavy. A 32 fl oz bottle covers 1,600 sq ft at the light rate or 800 sq ft at the heavy rate. |
| Triticonazole Concentrate Fungicide (sold as Ortho Disease Control, Ortho Rose & Flower Disease Control, Ortho Lawn Disease Control and other Ortho brands) | Roses, flowers, ornamental shrubs and trees, and houseplants | Black spot, powdery mildew, rust, leaf spots, anthracnose | 2 fl oz product per gallon of water[1] Each gallon is meant for 100 sq ft of garden. Spray upper and lower leaf surfaces and stems until wet, no more than 5 times a season. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if swallowed or absorbed through the skin and causes moderate eye irritation. Wear a long-sleeved shirt, long pants, socks, shoes and gloves while spraying.[1]
Pets
Keep children and pets out of treated areas until the spray has thoroughly dried. The label also says the product is toxic to wildlife.[1]
Bees and pollinators
Toxic to bees exposed to direct treatment. Don't spray while bees are actively visiting the treated area, such as blooming roses or flowers.[1]
Fish and water
Keep it out of storm drains, gutters, ditches and surface water. Spray in calm weather with no rain forecast for 24 hours, and rinse equipment over the treated area.[1]
Common questions
- How much Ortho Disease Control per gallon?
- 2 fl oz per gallon for garden plants and light lawn disease, and 4 fl oz per gallon for heavy lawn disease. Each gallon covers 100 sq ft.[1]
- Is triticonazole systemic?
- Yes. The label's product claims describe a systemic fungicide that works through leaves and stems and can't be washed off by rain once dry.[1]
- Can I use it on houseplants?
- Yes. The label lists houseplants such as philodendron, peace lily and schefflera, sprayed with a tank sprayer, up to 5 times a season.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Triticonazole Concentrate Fungicide (Ortho Disease Control) label, EPA Reg. No. 239-2700 (EPA-stamped, Oct. 13, 2017).” www3.epa.gov/pesticides/chem_search/ppls/000239-02700-20171013.pdf (accessed 2026-10-06)
- Fungicide Resistance Action Committee, “FRAC Code List 2025.” www.frac.info/media/ljsi3qrv/frac-code-list-2025.pdf (accessed 2026-10-06)