Opensight® specialty herbicide

Label | SDS

Opensight® specialty herbicide is a proven, cost-effective granule herbicide offering vegetation managers a convenient solution for hard-to-control weed and brush species, including many glyphosate- and sulfonylurea (SU)-resistant species.


  • Increases productivity with season-long control and application flexibility
  • Excellent tank-mix partner for bareground treatments
  • Two modes of action for resistance management
  • Controls more than 170 key broadleaf weed and woody plant species, including thistles, wild carrot, poison hemlock, goldenrods, dandelion, false dandelion, marestail, knapweeds, blackberry, black and honey locust, wisteria and tree-of-heaven
  • Invasive and noxious weed control, including whitetop and poison hemlock
  • Excellent tank-mix partner for woody plant control programs
  • Soil residual offering season-long control of germinating and emerging seedlings of hard-to-control noxious weeds
  • Reduced mowing cycles due to seedhead suppression on several grass species
  • Convenient dry-granule formulation provides broader control with less effort
  • Low use rates (1.5 to 3.3 ounces per acre)
  • Federally non-restricted use – no special license required to purchase or apply

Targeted Weeds


Roadside Trial Data

Opensight® specialty herbicide provides dual benefits on roadsides.

A 2011 study through multiple universities shows tall fescue foliage and seedhead growth (height growth) is significantly reduced by applications of Opensight® specialty herbicide compared with untreated areas. In addition to effective weed control, evaluations up to 70 days after treatment show seedhead suppression ranging from 84 percent to 100 percent seedhead reduction. The study also shows Opensight provided quality weed control in bermudagrass roadsides with minimal yellowing, thinning or stunting — helping decrease the potential for erosion and annual weed establishment.

Utility Trial Data

Opensight® specialty herbicide broadens spectrum for bareground mixes.

Herbicide field trials indicate that Opensight® specialty herbicide at 2 to 3.3 oz./A provided excellent control (>95%) of both common tansy and spotted knapweed 1 year after treatment. In the same studies, houndstongue and Canada thistle also were shown to have high control rates 1 year after treatment. Application timing was late bud to flower on common tansy and late bolt to bud stage on spotted knapweed. Applications were made to houndstongue at the rosette to early bolt growth stage. Applications were made to Canada thistle at the late bolt to early bud growth stage.


“Herbicides have played a major role in managing our roadsides for years. However, more recently, I’ve begun implementing what I call ’multipurpose’ herbicides into our program, as it condenses the number of products we have to hold in inventory. I also prefer to use products that have residual control, as this limits the frequency of applications, as well as reduces our labor hours.”
Johnnie Thorne, Mississippi DOT

"When managing utility rights-of-way, I recommend using Opensight in a tank mix with Garlon 3A to improve your control of berries, broom, noxious weeds and conifers. In addition, you can use Opensight up to the water’s edge and there are no grazing restrictions, which is especially important in open range areas where there are no fences and where grazing animals inhabit the rights-of-way.”
Bob Stewart, Dow AgroSciences VM Specialist

State Registrations

Available in State
  • Alaska
  • Alabama
  • Arkansas
  • Arizona
  • Colorado
  • Connecticut
  • Delaware
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  • Iowa
  • Idaho
  • Illinois
  • Indiana
  • Kansas
  • Kentucky
  • Louisiana
  • Massachusetts
  • Maryland
  • Maine
  • Michigan
  • Minnesota
  • Missouri
  • Mississippi
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  • North Carolina
  • North Dakota
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  • New Hampshire
  • New Jersey
  • New Mexico
  • Nevada
  • Ohio
  • Oklahoma
  • Oregon
  • Pennsylvania
  • Rhode Island
  • South Carolina
  • South Dakota
  • Tennessee
  • Texas
  • Utah
  • Virginia
  • Vermont
  • Washington
  • Wisconsin
  • West Virginia
  • Wyoming