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
- Napropamide
- Chemical class
- WSSA Group 15 herbicide; Group 15 compounds are thought to inhibit very-long-chain fatty acid synthesis and typically affect weeds before they emerge.[1][2]
- Mode of action
- WSSA Group 15: Very-long-chain fatty acid (VLCFA) synthesis inhibitors[2][1]
- Signal word
- Devrinol 2-XT Selective Herbicide: Caution[1]
Ornamentals on the label
Listed plants include daylily, hosta, chrysanthemum, daisy, gazania, coneflower, yarrow, bird of paradise and deciduous and evergreen trees. Field-grown iris, daffodil, tulip and lily bulbs have their own 6 fl oz per 1,000 sq ft rate.[1]
Planting after napropamide
Crops on the label can be planted right away. Leafy vegetables need 60 days, cereal grains 180 days, and other unlisted crops 365 days.[1]
Where it is used
It does not control established weeds. Apply to freshly weeded soil before seeds germinate, or in fall and winter for control the next spring and summer.[1]
Water it in: ornamentals and nursery stock need 1 to 2 inches of rain or irrigation soon after application, and ground covers and dichondra at least 1 inch.[1]
In warm-season turf, time crabgrass treatment 2 to 3 weeks before emergence. Goosegrass usually starts 6 to 7 weeks after crabgrass.[1]
Heavy leaf litter or trash on the ground can weaken control, and soils above 10% organic matter are generally not recommended.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Devrinol 2-XT Selective Herbicide[1] | UPL NA, Inc. | 70506-301 | 22.0% | soluble concentrate | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Devrinol 2-XT Selective Herbicide | Home grounds and other ornamental plantings, ground covers, field-grown nursery stock and container ornamentals | Annual grasses such as crabgrass, foxtails, goosegrass and annual bluegrass, plus chickweed, groundsel, purslane and other annual broadleaf weeds | 6–8.8 fl oz product per 1,000 sq ft[1] Mix in 2½ gallons of water per 1,000 sq ft (2 to 3 gallons per acre). Use the higher rate for heavy weed pressure or mainly broadleaf weeds. At most 2 applications and 4.5 gallons per acre per year. |
| Devrinol 2-XT Selective Herbicide | Established warm-season turf: bahiagrass, bermudagrass, centipedegrass, St. Augustinegrass, and fescue | Crabgrass, goosegrass and annual bluegrass | 3 fl oz product per 1,000 sq ft[1] In 2½ gallons of water per 1,000 sq ft (1 gallon per acre), 2 to 3 weeks before weeds emerge; fall timing for annual bluegrass. Needs ½ inch of rain or irrigation 2 to 3 days later. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if swallowed or absorbed through skin and causes moderate eye irritation. Repeated skin contact may cause allergic reactions in some people. Handlers wear long sleeves, long pants, waterproof gloves, and shoes plus socks.[1]
Pets
The label says not to let people or pets enter the treated area until sprays have dried, and not to graze treated areas.[1]
Bees and pollinators
There is no direct bee warning, but the label says it is toxic to plants and may harm forage and habitat of pollinators next to the treated site.[1]
Fish and water
Toxic to fish and aquatic invertebrates, with a high potential to reach surface water in runoff for months. A vegetated buffer near ponds and streams and avoiding application before rain within 48 hours both cut runoff.[1]
Common questions
- Will napropamide kill crabgrass that's already growing?
- No. The label says it does not control established weeds and must go down before weeds germinate.[1]
- How much Devrinol 2-XT per 1,000 square feet?
- 6 to 8.8 fl oz for ornamentals, or 3 fl oz for warm-season turf, each mixed in 2½ gallons of water.[1]
- Can it be used on cool-season lawns?
- The turf directions are for warm-season grasses only: bahia, bermuda, centipede, St. Augustine and fescue.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Devrinol 2-XT Selective Herbicide label, EPA Reg. No. 70506-301 (EPA-stamped, Apr. 11, 2024).” www3.epa.gov/pesticides/chem_search/ppls/070506-00301-20240411.pdf (accessed 2026-10-06)
- Weed Science Society of America, “Summary of Herbicide Mechanism of Action According to the Weed Science Society of America.” wssa.net/wp-content/uploads/WSSA-Mechanism-of-Action.pdf (accessed 2026-10-06)