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
- Polyoxin D zinc salt
- Chemical class
- Peptidyl pyrimidine nucleoside (polyoxin); FRAC Group 19, chitin synthase inhibitor in cell wall biosynthesis, rated medium resistance risk.[2]
- Mode of action
- FRAC Group 19: Polyoxins: chitin synthase inhibitors (cell wall biosynthesis)[2][1]
- Signal word
- Affirm WDG (alternate brand of Endorse Water Dispersible Granules): Caution[1]
A professional product
The Affirm WDG sublabel states it is not for food use and not for homeowner use. Lawn care and landscape professionals apply it to residential lawns and landscapes.[1]
Some disease claims marked on the label, such as the aids-in-control turf diseases, are not for use in California, and chemigation on turf and ornamentals is banned there.[1]
Where it is used
Apply before disease develops or when weather favors it. Turf sprays work best right after mowing.[1]
Except for fairy ring treatments, don't irrigate for 12 hours after spraying turf, because rain or watering soon after cuts disease control.[1]
Alternate with fungicides that have a different mode of action, and don't make back-to-back Group 19 sprays beyond the label's limits.[1]
Several turf diseases, including red thread and snow molds, are listed as aided in control. Gray leaf spot is aided in suppression only.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Affirm WDG (alternate brand of Endorse Water Dispersible Granules)[1] | Kaken Pharmaceutical Co., Ltd. | 68173-3 | 11.3% | water dispersible granules | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Affirm WDG (alternate brand of Endorse Water Dispersible Granules) | Turfgrass, including residential lawns, golf courses, parks and athletic fields | Brown patch and large patch; aids in control of red thread, leaf spot, snow molds, anthracnose, Waitea and zoysia patch | 2.4 lb product per acre[1] Use at least 66 gallons of water per acre and repeat every 7 to 14 days while weather favors disease. A shorter interval works best once symptoms show. |
| Affirm WDG (alternate brand of Endorse Water Dispersible Granules) | Turfgrass | Fairy ring (suppression and short-term control) | 1 oz product per 1,000 sq ft[1] Mix in at least 1 gallon of water with a penetrating wetting agent, make 2 or 3 applications 7 days apart, and water in right away. |
| Affirm WDG (alternate brand of Endorse Water Dispersible Granules) | Ornamentals in landscapes, nurseries and greenhouses | Powdery and downy mildew, Botrytis blight, anthracnose, Rhizoctonia aerial blight and root rot, black root rot | 0.25–0.5 lb product per 100 gallons of water[1] Spray foliage every 7 to 10 days, or drench roots every 14 to 28 days. No more than 6 applications per season or 12 months. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if absorbed through the skin, swallowed or inhaled, and causes moderate eye irritation. Handlers wear long sleeves, long pants, socks, shoes and waterproof gloves.[1]
Pets
For lawn and landscape uses, the label says to keep children and pets out of the treated area until sprays have dried.[1]
Bees and pollinators
The label carries no bee or pollinator hazard statement.[1]
Fish and water
Moderately toxic to aquatic invertebrates and fish. Don't apply to water or let runoff reach lakes, streams or ponds, and collect any granules spilled during loading.[1]
Common questions
- How much Affirm WDG per 1,000 square feet for fairy ring?
- One ounce per 1,000 square feet in at least a gallon of water, applied 2 or 3 times a week apart and watered in.[1]
- Can homeowners buy and use Affirm?
- The label says this sublabel is not for homeowner use, so it is meant for professional applicators.[1]
- What fungicide group is polyoxin D?
- FRAC Group 19, the polyoxins, which block chitin synthase in fungal cell walls.[2]
Sources
- U.S. EPA Pesticide Product Label System, “Endorse Water Dispersible Granules (Affirm WDG sublabel) label, EPA Reg. No. 68173-3 (EPA-stamped, July 12, 2019).” www3.epa.gov/pesticides/chem_search/ppls/068173-00003-20190712.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)