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
- Thiophanate-methyl
- Chemical class
- Thiophanate; FRAC Group 1 MBC fungicides (methyl benzimidazole carbamates).[2]
- Mode of action
- FRAC Group 1: MBC fungicides (methyl benzimidazole carbamates): thiophanates[2]
- Signal word
- 3336 F Turf and Ornamental Systemic Fungicide: Caution[1]
Professional turf label, homeowner ornamental label
The main label is for professional applicators, and its turf directions say not for homeowner use. A separate homeowner sub-label under the same registration covers flowers, shrubs and trees only.[1]
Some plants react badly. The label warns of possible injury to Swedish ivy, Boston fern and Easter cactus, and suggests a small test on any unlisted plant, checking after 5 to 7 days.[1]
Where it is used
Buffer the tank water to pH 6 to 7 before adding it; the label says high pH breaks down thiophanate-methyl. Use the mix the same day.[1]
Never tank-mix it with copper products or highly alkaline materials such as Bordeaux mixture or lime sulfur.[1]
On turf, apply after mowing or hold off mowing for 12 hours. For root diseases, water it in lightly with one to two tenths of an inch.[1]
It won't control Pythium or Phytophthora root rots. The label requires a partner product such as mefenoxam or a phosphorous acid salt for those.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| 3336 F Turf and Ornamental Systemic Fungicide[1] | Cleary Chemicals LLC | 1001-69 | 41.25% | liquid concentrate | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| 3336 F Turf and Ornamental Systemic Fungicide | Home lawns, parks, athletic fields, schools and golf courses (certified applicators only) | Dollar spot, brown patch, anthracnose, summer patch, necrotic ring spot, gray leaf spot, rusts, snow molds and other turf diseases | 2–6 fl oz product per 1,000 sq ft[1] On residential and public turf the cap is 2 fl oz per 1,000 sq ft per application, at least 14 days apart, with no more than 8 fl oz and 4 applications a year. Higher rates are for golf tees, greens and aprons. |
| 3336 F Turf and Ornamental Systemic Fungicide | Nursery, greenhouse, landscape and interiorscape ornamentals | Anthracnose, rose black spot, leaf spots and blights, powdery mildew, rusts, scab, tip blight of pine, cankers | 8–24 fl oz product per 100 gallons of water[1] Most diseases take 12 to 16 fl oz per 100 gallons every 7 to 14 days; powdery mildew 12 to 24 fl oz; pine tip blight and cankers 16 to 24 fl oz. |
| 3336 F Turf and Ornamental Systemic Fungicide | Home flowers, shrubs and trees (homeowner sub-label) | Anthracnose, black spot of rose, leaf spots, powdery mildew, rusts, scab | 0.5–1.5 teaspoons product per gallon of water[1] Spray to drip every 7 to 14 days. The homeowner label is for ornamentals only, not lawns or home fruit trees. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if absorbed through skin or inhaled. Avoid breathing spray mist. Mixers and applicators wear long sleeves, long pants, shoes with socks and waterproof gloves, plus an apron around the concentrate.[1]
Pets
Keep children and pets out of treated areas until sprays have dried. Don't graze animals on treated turf or feed clippings to livestock or poultry.[1]
Bees and pollinators
The 3336 F label has no bee or pollinator warning.[1]
Fish and water
Don't apply directly to water or where surface water is present. Runoff from treated areas may harm aquatic organisms nearby.[1]
Resistance
FRAC rates the Group 1 MBC fungicides as high resistance risk. The label adds that thiabendazole and other thiophanate-methyl products don't count as rotation partners, since they share its chemistry.[2][1]
Common questions
- How much 3336 F per gallon?
- For ornamentals, 0.5 to 1.5 teaspoons per gallon of water, sprayed to drip. Powdery mildew takes at least 1 teaspoon.[1]
- Can I use thiophanate-methyl on my own lawn?
- Not under this label. Its turf use is restricted to certified applicators or people they directly supervise, with a 2 fl oz per 1,000 sq ft cap on home lawns.[1]
- Does thiophanate-methyl control dollar spot?
- Yes. Dollar spot is listed at 2 to 4 fl oz per 1,000 sq ft, starting when disease first appears and repeating every 14 days.[1]
Sources
- U.S. EPA Pesticide Product Label System, “3336 F Turf and Ornamental Systemic Fungicide label, EPA Reg. No. 1001-69 (EPA-stamped, Dec. 4, 2018).” www3.epa.gov/pesticides/chem_search/ppls/001001-00069-20181204.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)