General Information


AUTHORITY ASSIST is a soluble concentrate formulation. AUTHORITY ASSIST is to be mixed with water, liquid fertilizer, or mixtures of water and liquid fertilizer and sprayed for selective preemergence or preplant incorporated weed control in soybeans. When applied according to the instructions on the label, AUTHORITY ASSIST will control listed broadleaf and sedge weeds and provide grass suppression.

AUTHORITY ASSIST is for use in soybeans only.

The mode-of-action of AUTHORITY ASSIST herbicide involves uptake by weed roots and shoots. Preemergence and preplant incorporated applications of AUTHORITY ASSIST herbicide require rainfall or irrigation to activate the herbicide. The amount of rainfall or irrigation required for activation following application depends on existing soil moisture, organic matter content and soil texture. AUTHORITY ASSIST must be activated by 0.5 to 1.0 inch of rainfall or irrigation water or erratic weed control will result. If adequate moisture (1/2\" to 1\") is not received within 7 to 10 days after the AUTHORITY ASSIST treatment, a shallow cultivation may be needed to aid in activation to obtain desired weed control. When sufficient moisture is received after dry conditions, AUTHORITY

ASSIST herbicide will provide control of susceptible germinating weeds. Activity on established weeds is dependent on the weed species and the depth of the root system in the soil. Soil applications of AUTHORITY ASSIST must be made before crop seed germination to prevent injury to the emerging crop seedlings. When applications after planting are delayed, injury may occur if seeds are germinating or if they are located near the soil surface.

AUTHORITY ASSIST herbicide exhibits excellent crop safety. Poor growing conditions, such as excessive moisture, cool temperatures, and soil compaction or the presence of various pathogens may impact seedling vigor. Under these conditions, the active ingredients in AUTHORITY ASSIST, like other soil-applied herbicides, can contribute to crop response. However, these early symptoms are short-lived. Observe all instructions, crop restrictions, mixing directions, application precautions, replanting directions, rotational crop guidelines and other label information of each product when tank-mixing with AUTHORITY ASSIST.



Ground Application

Use a conventional low-pressure herbicide boom sprayer equipped with suitable nozzles and screens. Apply uniformly using properly-calibrated nozzles (10 to 40 psi) and screens and strainers no finer than 50 mesh. Use 10 to 40 gallons of spray solution per acre. Do not exceed 40 psi spray pressure unless required by the spray nozzle manufacturer.

Water or liquid fertilizer solutions may be used as the carrier for AUTHORITY ASSIST when applied alone or in tank-mixtures with other registered soybean herbicides. A jar test is recommended to determine the compatibility of AUTHORITY ASSIST and the fertilizer solution.

Continuous agitation is required until all spray mixture has been applied. Avoid swath overlaps. Shut off spray booms while turning, slowing or stopping, as over application may result. Do not allow AUTHORITY ASSIST spray mixtures to sit overnight as settling of product and difficulty of re-suspending may occur.

To avoid injury to sensitive crops, spray equipment used for AUTHORITY ASSIST applications must be drained and thoroughly cleaned with water plus ammonia before being used to apply other products. See Spray Clean-out Section 21 on page 5 of the label.

Avoid all direct, and/or indirect spray contact with non-target plants. Do not apply near desirable vegetation. Allow adequate distance between target area and desirable plants to minimize exposure.

Aerial Application

AUTHORITY ASSIST may be applied by air using properly-calibrated nozzle types and arrangements that will provide optimum coverage while producing minimal amounts of fine droplets. Apply sufficient spray volume to achieve adequate coverage. Apply a minimum of five (5) gallons of finished spray per acre. Do not apply when wind speed favors drift beyond the area intended for treatment.


Select the proper AUTHORITY ASSIST application rate from the following TIMING AND METHOD OF APPLICATION section of the label. Fill the spray tank with approximately one-half of the volume of water needed for the acreage being treated. With agitator operating, add the required amount of AUTHORITY ASSIST for acreage being treated by opening the bottle(s) and measuring directly into the spray tank. Allow the product to fully disperse. Complete the addition of spray water. Maintain agitation during filling, mixing and application. Apply the AUTHORITY ASSIST spray mixture immediately after mixing.

Do not store spray mixture.

Do not prepare spray mixtures in nurse tanks.

SOYBEANS (Conventional and GMO)


AUTHORITY ASSIST may be applied alone or in tank-mixture combinations for the control of the weeds listed in conventional or GMO soybean varieties.

AUTHORITY ASSIST can be applied from 45 days prior to planting up to 3 days after planting. Do not apply more than 3 days after planting or if soybean seedlings are emerging as plant injury may occur. When applying AUTHORITY ASSIST greater than 30 days pre-plant, use the highest application rate within the rate range for the appropriate soil texture and organic matter. AUTHORITY ASSIST may be applied preemergence or preplant incorporated. AUTHORITY ASSIST applied near or after crop emergence may cause severe injury to the crop. AUTHORITY ASSIST may be followed by labeled postemergence soybean herbicides for increased control of grass and broadleaf weeds. Always follow the most restrictive label when tank-mixing.


Limitations, Restrictions, and Exceptions


Use higher rates for soils of pH less than 7.0 and lower rates for pH greater than 7.0 within the rate range.

Do not use on coarse soils classified as sand, which have less than 1% organic matter.

Reduced Rates for Roundup Ready Soybeans

AUTHORITY ASSIST may be used at reduced rates in conjunction with planned follow-up weed control applications with glyphosate based herbicide products labeled for use on Roundup Ready soybean varieties.

Follow all AUTHORITY ASSIST application directions.

Apply before planting, at planting time or prior to seed germination. Properly-closed seed furrows are necessary when applying at planting time or before seed germination. Recommended postemergence treatments may include any product or combination of products labeled for use.

Fall Applications: AUTHORITY ASSIST may be applied as a fall treatment to the stubble of harvested crops for the burndown of existing vegetation and preemergence control of labeled weeds the following spring in no-till and conservation tillage production systems. If weeds are emerged at the time of application, utilize a tank-mixture with a suitable burndown herbicide at labeled rates. Fall applied burndown treatments should be made with a minimum of 15 gallons per acre to achieve adequate coverage of the weeds being treated. Gallonage should be increased where weed density is high or heavy crop residue levels are present. When making burndown applications to emerged weeds, the addition of adjuvants such as COC or MSO to the spray mixture can be used to enhance the burndown activity of the application. If weeds are present at time of AUTHORITY ASSIST application apply with appropriate burndown herbicides for improved control of existing weeds. Refer to product labels for use rates and instructions. For AUTHORITY ASSIST application rates refer to the table for Roundup Ready Soybeans.

Preplant Weed Suppression for Roundup Ready Soybeans: Apply AUTHORITY ASSIST alone or in a tank-mixture with other registered, soil applied soybean herbicides, to reduce competition from weeds when followed by a planned postemergence application(s). Apply before planting, at plant or within 3 days after planting. Properly-closed seed furrow is necessary to avoid potential crop response when applying at plant or after planting. Recommended postemergence treatments include any product or combination of products labeled to control specific weeds remaining in the field, including any glyphosate based herbicide labeled for use on Roundup Ready soybean varieties. For applications greater than 30 days preplant use the higher application rate for the appropriate soil texture and organic matter. For applications greater than 30 days preplant multiple in-season applications of a glyphosate based herbicide may be needed due to increased window for weed emergence, reduced competition from soybean crop and longer period of time prior to soybean canopy closure.

Note: AUTHORITY ASSIST is not for use after crop has emerged.


Properly-closed seed furrows are necessary when applying at planting time of before seed germination.

Maintain spray tank agitation until the spray mixture is applied.

Do not store spray mixtures.

The use directions are based on the interactive effects of AUTHORITY ASSIST and the primary soil and environmental factors, which affect its activity on various weed species and tolerance among crops. The user is required to observe the instructions and recommendations presented under General Application Information, Soybean Application use directions, Product Use Rates, Rotational Guidelines, Weeds Controlled and other sections of the label pertinent to the anticipated use. It is important to note that not all cultivars have been tested with AUTHORITY ASSIST. Consult University or Extension specialists for additional information on specific local varieties and any other pertinent local information.

AUTHORITY ASSIST will not control or reduce competition from ALS-resistant biotypes.


Do not apply this product by air or through any type of irrigation system.

This period is considered to begin with the initial sulfentrazone application.

Do not apply to frozen soils.

Do not feed treated soybean forage, soybean hay or soybean straw to livestock.

Do not apply AUTHORITY ASSIST to soils classified as sands containing less than 1% organic matter.

Do not drain or flush equipment on or near desirable trees or plants. Do not contaminate any body of water including irrigation water that may be used on other crops.

Do not incorporate deeper than 2 inches.

Do not apply to soils with pH of 7.5 or higher.

Do not apply AUTHORITY ASSIST North of North Dakota State Highway 13 or Minnesota State Highway 210.

If soybeans are furrow irrigated, till the soil prior to planting winter wheat or barley. The beds should be broken up and the soil mixed with tillage equipment set to operate four (4) to six (6) inches deep.

Restricted Entry Interval

12 hours