RONSTAR FLO HERBICIDE

ENVIRONMENTAL SCIENCE U.S., LLC · Oxadiazon 34.1% · EPA Reg 101563-125 · HERBICIDE Document last checked 2024-07-29

About this product

Active ingredient Oxadiazon 34.1%

Manufacturer ENVIRONMENTAL SCIENCE U.S., LLC

Category HERBICIDE

Full details for RONSTAR FLO HERBICIDE

EPA registration data Reg. 101563-125 — registry reference, signal word and status.

Applicator discussion

Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.

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According to the label From the product label

These details were extracted from this product's label PDF. The label is the law. Confirm every rate, site, restriction and safety requirement against the label before mixing or applying. Check for a state supplemental label; a product may be restricted or prohibited in a state or site even when a rate appears below. · EPA registration data for Reg. 101563-125 →

Ronstar FLO is a herbicide used to control crabgrass, goosegrass, annual bluegrass, annual sedge, Virginia buttonweed, and various annual grasses and broadleaf weeds. It is applied outdoors to managed turf areas like golf courses, parks, athletics fields, and sod farms, as well as to woody ornamental shrubs, trees, rights of way, and conifer nurseries. For best results, the product is diluted with water and must be thoroughly irrigated on the same day of application to move it from the foliage to the soil surface.

Pests covered (42)

Crabgrass (Digitaria spp.), Goosegrass (Eleusine indica), Annual Bluegrass (Poa annua), Annual Sedge (Cyperus compressus)Virginia Buttonweed (Diodia virginiana)Crabgrass, Goosegrass, and Annual Sedgeannual grasses and broadleaf weeds such as: Bittercress (Cardamine spp.), Bristly Oxtongue† (Picris echioides), Carpetweed (Mollugo verticillata), Cheeseweed† (Malva parviflora), Common Groundsel (Senecio vulgaris), Common Purslane (Portulaca oleracea), Evening Primrose (Oenothera spp.), Fiddleneck† (Amsinckia intermedia), Fireweed† (Epilobium angustifolium), Florida Pusley (Richardia scabia), Galinsoga (Galinsoga spp.), Golden Ragwort (Senecio aureus), Lambsquarters (Chenopodium album), Annual Bluegrass†, Annual Sedge†, BarnLAMBSQUARTERS (PREEMERGENCE)ANNUAL BROADLEAF WEEDS (PREEMERGENCE)LIVERWORT (PREEMERGENCE)CARPETWEED (PREEMERGENCE)REDROOT PIGWEED (PREEMERGENCE)FIDDLENECK (PREEMERGENCE)FALL PANICUM (PREEMERGENCE)VIRGINIA BUTTONWEED (PREEMERGENCE)FLORIDA PUSLEY (PREEMERGENCE)ANNUAL BLUEGRASS (PREEMERGENCE)GREEN FOXTAIL (PREEMERGENCE)SPEEDWELL (PREEMERGENCE)CHEESEWEED (PREEMERGENCE)FIREWEED (PREEMERGENCE)EVENINGPRIMROSE (PREEMERGENCE)OXALIS (PREEMERGENCE)YELLOW WOODSORREL (PREEMERGENCE)PETTY SPURGE (PREEMERGENCE)PROSTRATE SPURGE (PREEMERGENCE)ANNUAL GRASSES (PREEMERGENCE)WILD OAT (PREEMERGENCE)CARPETGRASS (PREEMERGENCE)RIPGUT BROME (PREEMERGENCE)CRABGRASS (PREEMERGENCE)BARNYARDGRASS (PREEMERGENCE)GOOSEGRASS (PREEMERGENCE)SHEPHERDSPURSE (PREEMERGENCE)BITTERCRESS (PREEMERGENCE)SWINECRESS (PREEMERGENCE)GALINSOGA (PREEMERGENCE)SPOTTED CATSEAR (PREEMERGENCE)BRISTLY OXTONGUE (PREEMERGENCE)GOLDEN RAGWORT (PREEMERGENCE)COMMON GROUNDSEL (PREEMERGENCE)SOWTHISTLE (PREEMERGENCE)PENNSYLVANIA SMARTWEED (PREEMERGENCE)COMMON PURSLANE (PREEMERGENCE)ANNUAL SEDGE (PREEMERGENCE)

Areas treatable (65)

dormant, established Bermudagrass, St. Augustine grass* and Zoysia turf* such as golf courses (including fairways, roughs, non playable turf surfaces, or other managed turf areas), parks, athletics fields and sod farmsANNUAL WEED CONTROL DURING BERMUDAGRASS ESTABLISHMENT FROM SPRIGS*WOODY ORNAMENTAL SHRUBS AND TREES, RIGHTS OF WAY, CONIFER NURSERY AND ORNAMENTALSMUGHO PINE (SOIL TREATMENT)EASTERN REDCEDAR (SOIL TREATMENT)EASTERN WHITE PINE (SOIL TREATMENT)ENGLISH IVY (SOIL TREATMENT)JAPANESE BARBERRY (SOIL TREATMENT)JAPANESE HOLLY (SOIL TREATMENT)ALGERIAN IVY (SOIL TREATMENT)NOBLE FIR (SOIL TREATMENT)STATICE (SOIL TREATMENT)CRANBERRIES (SOIL TREATMENT)ORNAMENTAL CONIFERS (NURSERY)ARBORVITAE (SOIL TREATMENT)BLUE SPRUCE (SOIL TREATMENT)BOXWOOD (SOIL TREATMENT)FRASER FIR (SOIL TREATMENT)GRAND FIR (SOIL TREATMENT)ST. AUGUSTINEGRASS (GOLF FAIRWAYS) (DORMANT APPLICATION)ST. AUGUSTINEGRASS (LAWNS) (DORMANT APPLICATION)ST. AUGUSTINEGRASS (ORNAMENTAL TURF) (DORMANT APPLICATION)ST. AUGUSTINEGRASS (PARKS) (DORMANT APPLICATION)HINOKI FALSE CYPRESS (SOIL TREATMENT)SAWARA FALSE CYPRESS (SOIL TREATMENT)ANDORRA JUNIPER (SOIL TREATMENT)COMMON JUNIPER (SOIL TREATMENT)OPHIOPOGON (SOIL TREATMENT)ROADSIDES (SOIL TREATMENT)ORNAMENTAL TURF (LAWNS) (DORMANT APPLICATION)OLEANDER (SOIL TREATMENT)TANK MIXFALSE CYPRESS (NOOTKA AUREA) (SOIL TREATMENT)DOUGLAS-FIR (SOIL TREATMENT)INDUSTRIAL SITES (SOIL TREATMENT)SCOTCH PINE (SOIL TREATMENT)CREEPING JUNIPER (SOIL TREATMENT)ZOYSIAGRASS (GOLF FAIRWAYS) (DORMANT APPLICATION)ORNAMENTAL AND/OR SHADE TREES (ALL OR UNSPECIFIED)CANADA HEMLOCK (SOIL TREATMENT)JUNIPER (BLUE RUG) (SOIL TREATMENT)ORNAMENTAL TREES (SOIL TREATMENT)ORNAMENTAL WOODY SHRUBS (SOIL TREATMENT)BABY'S-BREATH (SOIL TREATMENT)EVERGREEN EUONYMUS (SOIL TREATMENT)CHINESE HOLLY (SOIL TREATMENT)ORNAMENTAL TURF (GOLF COURSES) (DORMANT APPLICATION)AFRICAN TRAILING DAISY (SOIL TREATMENT)ZOYSIAGRASS (LAWNS) (DORMANT APPLICATION)ZOYSIAGRASS (ORNAMENTAL TURF) (DORMANT APPLICATION)ZOYSIAGRASS (GOLF COURSES) (DORMANT APPLICATION)ZOYSIAGRASS (PARKS) (DORMANT APPLICATION)COMMON PERIWINKLE (SOIL TREATMENT)BIGLEAF PERIWINKLE (SOIL TREATMENT)BERMUDAGRASS (ORNAMENTAL TURF) (DORMANT APPLICATION)BERMUDAGRASS (GOLF COURSES) (DORMANT APPLICATION)BERMUDAGRASS (PARKS) (DORMANT APPLICATION)ORNAMENTAL TURF (DORMANT APPLICATION)ORNAMENTAL TURF (PARKS) (DORMANT APPLICATION)LARGELEAF ICEPLANT (SOIL TREATMENT)BERMUDAGRASS (GOLF FAIRWAYS) (DORMANT APPLICATION)BERMUDAGRASS (LAWNS) (DORMANT APPLICATION)RAPHIOLEPIS (SOIL TREATMENT)GLADIOLUS (SOIL TREATMENT)KUROGANE HOLLY (SOIL TREATMENT)

How to treat each type of area 4

dormant, established Bermudagrass, St. Augustine grass* and Zoysia turf* such as golf courses (including fairways, roughs, non playable turf surfaces, or other managed turf areas), parks, athletics fields and sod farms

Target pest	Location	Rate	Unit	Dilution	Label notes
Crabgrass (Digitaria spp.), Goosegrass (Eleusine indica), Annual Bluegrass (Poa annua), Annual Sedge (Cyperus compressus)	Outdoor	1.85-2.8	FL OZ PER 1000 sq. ft.	0.75 – 3.5 gallons of water per 1000 sq. ft.	(2.0-3.0 lb ai/A)
Virginia Buttonweed (Diodia virginiana)	Outdoor	2.8	FL OZ PER 1000 sq. ft.	0.75 – 3.5 gallons of water per 1000 sq. ft.	(3.0 lb ai/A)

ANNUAL WEED CONTROL DURING BERMUDAGRASS ESTABLISHMENT FROM SPRIGS*

Target pest	Location	Rate	Unit	Dilution	Label notes
Crabgrass, Goosegrass, and Annual Sedge	Outdoor	1.85	FL OZ PER 1000 sq. ft.	0.75 – 3.5 gallons of water per 1000 sq. ft.	(2.0 lb ai/A)

WOODY ORNAMENTAL SHRUBS AND TREES, RIGHTS OF WAY, CONIFER NURSERY AND ORNAMENTALS

Target pest	Location	Rate	Unit
annual grasses and broadleaf weeds such as: Bittercress (Cardamine spp.), Bristly Oxtongue† (Picris echioides), Carpetweed (Mollugo verticillata), Cheeseweed† (Malva parviflora), Common Groundsel (Senecio vulgaris), Common Purslane (Portulaca oleracea), Evening Primrose (Oenothera spp.), Fiddleneck† (Amsinckia intermedia), Fireweed† (Epilobium angustifolium), Florida Pusley (Richardia scabia), Galinsoga (Galinsoga spp.), Golden Ragwort (Senecio aureus), Lambsquarters (Chenopodium album), Annual Bluegrass†, Annual Sedge†, Barn	Outdoor	1.85 to 2.8	fl oz per 1000 sq. ft.

Timing & weather

RONSTAR® FLO HERBICIDE must be applied at least 2-3 weeks prior to green up.
Apply in late winter or early spring prior to weed seed germination and turf greenup.
After application, user must thoroughly irrigate the site as soon as possible on the same day of application.
Make application immediately prior to or immediately after sprigging.
Rainfall or overhead irrigation (one-half inch) immediately after application of RONSTAR® FLO HERBICIDE will improve weed control activity.
After application, user must thoroughly irrigate the site as soon as possible on the day of application to move the RONSTAR® FLO HERBICIDE from the foliage to the soil surface.

Use restrictions 9

DO NOT USE ON ST. AUGUSTINE GRASS OR ZOYSIA TURF IN CALIFORNIA.
Not currently registered in California.
Do not apply RONSTAR® FLO HERBICIDE to newly seeded areas.
Seeding into treated areas must be delayed until 4 months after treatment.
RONSTAR® FLO HERBICIDE must not be used on putting greens or tees because of the varying cultural practices used.
May not be applied to ornamentals in residential properties.
RONSTAR® FLO HERBICIDE must not be applied during bud break or during the 4 weeks after bud break.
RONSTAR® FLO HERBICIDE must not be mixed into the soil.
Do not apply in greenhouses as plant injury may result from co-distillation of RONSTAR® FLO HERBICIDE active ingredient onto leaf surfaces in condensation.