CHLORSULFURON

Trade name(s) Glean F.C., Telar DF

Manufacturer(s) DuPont

Formulation(s) 75% dry flowable

Remarks A selective preemergence or early postemergence herbicide used at low rates. Carefully consider crop rotation plans before using. Recommended for use in wheat, barley, oats, and in fallow on soils of pH 7.5 or less. Telar formulation is a selective broadleaf herbicide used preemergence to postemergence in noncropland areas.

Water solubility 587 ppm at pH 5; 31,800 ppm at pH 7

Storage conditions Stable when excess moisture or humidity are excluded from container.

Acute toxicity LD50 - 5,545 mg/kg

Action in plant Interferes with enzyme acetolactate synthase, resulting in a rapid cessation of cell division and plant growth in both roots and shoots.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

Koc Average is 40 mL/g at pH 7

Vegetation Control

Tim Prather
Revised March 2012

Total vegetation control with soil-residual herbicides is a process in which the addition of chemicals renders the soil unfit for plant growth. Soil-residual herbicides do not kill all animal and microbiological life in the soil.

Keep the following in mind when using soil-residual herbicides:

Weed Control in Pasture and Rangeland

Tim Prather
Revised September 2013

Controlling undesirable plants on rangeland is an important part of an overall range management program. Undesirable plants use space, moisture, and nutrients that could be put to better use producing forage for grazing animals. Poisonous plants are an additional threat to animal health and productivity.

Small Pastures

Andrew Hulting
Revised March 2014

Serious weed management issues in pastures are a symptom of a problem with the crop or site. These problems can include grazing methods, fertilization programs, forage species selection, and irrigation or water management.

Tall Fescue

Andrew Hulting
Revised September 2013

Note Also see GRASS SEED—New and Established for herbicides that may be used on many species of grass grown for seed.

bromoxynil + pyrasulfotole (Huskie)

Rate 0.185 to 0.205 lb ai/A bromoxynil + 0.033 to 0.036 lb ai/A pyrasulfotole (13.5 to 15 oz/A Huskie)

Conservation Reserve Program

Andy Hulting and Ed Peachey
Revised December 2013

The Conservation Reserve Program (CRP) is designed to control erosion, improve water quality and enhance wildlife habitat on environmentally sensitive land by planting permanent crops. A combination of desirable plants including trees, grasses, legumes, and shrubs must be planted and maintained for the duration of the contract which usually runs for 10 to 15 years. CRP land may not be harvested or grazed by domestic animals except under emergency circumstances following natural disasters, or certain other managed conditions.

Spring Wheat

Don Morishita and Drew Lyon
Revised December 2012

SPRING WHEAT—Preplant and Preemergence Weed Control

carfentrazone (Aim EC, Aim EW)

Rate 0.008 to 0.031 lb ai/A (0.5 to 2 fl oz Aim EC or EW)

Time Apply before, during, or after grain has been planted.

Winter Wheat-West of the Cascades

Andrew Hulting
Revised September 2013

WINTER WHEAT—West of the Cascades—Preplant Broadleaf and Grass Weed Control

flumioxazin (Valor)

Rate 0.0637 lb ai/A (2.0 oz/A Valor)

Winter Wheat-Nonirrigated East of the Cascades

Drew Lyon
Revised March 2014

WINTER WHEAT—Nonirrigated, East of the Cascades—Downy Brome

flufenacet + metribuzin (Axiom DF)

Suppression only

Rate 0.136 to 0.34 lb/A flufenacet and 0.034 to 0.085 lb/A metribuzin (4 to 10 oz/A Axiom DF)

Time Apply from wheat germination to the two-leaf growth stage.

Oats

Don Morishita and Dan Ball
Revised December 2012

Oats—Preplant and Preemergence Weed Control

carfentrazone (Aim EC, Aim EW)

Rate Up to 0.031 lb ai/A (2 fl oz Aim EC or Aim EW)

Time Apply before, during, or after oats have been planted.

Barley

Don Morishita
Revised March 2014

BARLEY—Preplant and Preemergence Weed Control

carfentrazone (Aim EC)

Rate 0.008 to 0.031 lb ai/A (0.5 to 2 fl oz Aim 2EC)

Time Apply before, during, or after grain has been planted.

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