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
- Isoxaben (CAS 82558-50-7)
- Chemical class
- Benzamide cellulose biosynthesis inhibitor. The Gallery label assigns it WSSA Group 29; the WSSA mechanism summary lists benzamides as Group 21 in its cellulose inhibitor section.[1][2]
- Mode of action
- WSSA Group 29: Cellulose biosynthesis inhibitors (benzamides); group number as stated on the label[1]
- Signal word
- Gallery 75 Dry Flowable Specialty Herbicide (also sold as Gallery T&V 75 Dry Flowable): Caution[1]
Seeding and new lawns
Don't overseed an established lawn sooner than 60 days after an application. On new seedings, wait until the grass is at the three-leaf stage, tillering and well rooted.[1]
It is labeled for Kentucky bluegrass, fescues, perennial ryegrass, bentgrass, bermudagrass, St. Augustinegrass, zoysiagrass, centipedegrass, bahiagrass and buffalograss, but not for putting greens or dichondra.[1]
Ornamentals to avoid
The label lists plants that have been injured, including ajuga, purple coneflower, hydrangea, candytuft, Euphorbia, dwarf burning bush and some rhododendrons. Avoid beds where bedding plants will go in within a year.[1]
Where it is used
Apply before target weeds germinate: late summer to early fall, early spring, or right after cultivating. It controls only weeds from seed, not established weeds or ones sprouting from roots or runners.[1]
It needs at least 0.5 inch of rain or sprinkler water to activate. It can sit on the soil surface for up to 21 days, but control gets erratic if it isn't watered in by then.[1]
Clear existing weeds, prunings and debris first, by cultivation or a postemergence herbicide.[1]
When replanting in a bed treated within the past 8 months, use untreated soil as fill around the roots.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Gallery 75 Dry Flowable Specialty Herbicide (also sold as Gallery T&V 75 Dry Flowable)[1] | Corteva Agriscience, LLC | 62719-145 | 75.0% | dry flowable | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Gallery 75 Dry Flowable Specialty Herbicide (also sold as Gallery T&V 75 Dry Flowable) | Established cool- and warm-season turf, landscape and container ornamentals, groundcovers, bulbs, non-cropland | Chickweed, white clover, henbit, dandelion, spotted spurge, yellow woodsorrel (oxalis), plantains, purslane, bittercress, lawn burweed and other listed broadleaf weeds | 0.25–0.5 oz product per 1,000 sq ft[1] 0.25 oz (0.66 lb per acre) covers the easiest weeds, 0.38 oz (1 lb per acre) adds dandelion, spurge and oxalis, and 0.5 oz (1.33 lb per acre) reaches the toughest listed weeds. No more than 4 lb per acre in 12 months, with 60 days between applications of 1 lb per acre or more. |
Safety and environmental hazards
People
Signal word CAUTION: causes eye irritation and is harmful if inhaled. Avoid breathing dust or spray mist; handlers wear long sleeves, long pants, shoes and socks.[1]
Pets
In landscape and turf settings, the label says not to enter treated areas until sprays have dried unless wearing coveralls, waterproof gloves, shoes and socks.[1]
Bees and pollinators
The label has no bee warning. Its non-target warning is that drift can reduce germination or emergence of nearby plants.[1]
Fish and water
Don't apply directly to water. Isoxaben may leach to groundwater in permeable soils and has a high potential to reach surface water in runoff for several months; a vegetated buffer strip reduces that.[1]
Common questions
- Will isoxaben kill weeds that are already growing?
- No. Gallery controls weeds germinating from seed only, so existing weeds need to be pulled, cultivated or sprayed with a postemergence product.[1]
- Does isoxaben stop crabgrass?
- The weed lists are broadleaf weeds, plus rattail fescue at the top rate. For annual grasses, the label allows a tank mix with dithiopyr, or a separate treatment alongside benfluralin or trifluralin in turf.[1]
- How long after Gallery can I overseed my lawn?
- At least 60 days, according to the label's turf restrictions.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Gallery 75 Dry Flowable Specialty Herbicide label, EPA Reg. No. 62719-145 (EPA-stamped, July 12, 2023).” www3.epa.gov/pesticides/chem_search/ppls/062719-00145-20230712.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)