General Information

General Information

Use Starane Flex herbicide as a postemergence herbicide for the control of annual broadleaf weeds such as kochia, chickweed, wild buckwheat, mustards and cleavers in wheat (including spring, winter and durum), b arley, oats, rye and triticale not underseeded with legumes.

Starane Flex rapidly stops growth of susceptible weeds. However, typical symptoms (discoloration) of dying weeds may not be noticeable for 1 to 2 weeks after application depending upon growing conditions and weed susceptibility. Degree of control and duration of effect are dependent upon weed sensitivity, weed size, crop competition, growing conditions at a n d following treatment, and spray coverage.

Use Precautions and Restrictions

When applying this product in tank mix combination, follow all applicable u se directions, precautions, and limitations on each manufacturer’s label.

Chemigation: Do not apply this product through any type of irrigation system.

Do not apply Starane Flex directly to, or otherwise permit it to come into direct contact with, susceptible crops or desirable plants including alfalfa, edible beans, canola, flowers and ornamentals, lentils, lettuce, peas, potatoes, radishes, soybeans, sugar beets, sunfLowers, tomatoes, or tobacco. Do not permit spray mists containing Starane Flex to drift onto such plants.

For best resistance management stewardship, do not use more than once per season or use in successive years at the same site.

T his product has potential to leach. Do not apply excessive irrigation.

D o not apply to crops underseeded with legumes.

Ground Applications: To minimize spray drift, apply Starane Flex in a total spray volume of 8 gallons or more per acre using spray equipment designed to produce large droplet, low pressure sprays. Refer to the spray equipment manufacturer's recommendations for detailed information on nozzle types, arrangement, spacing and operating height and pressure.

Spot treatments should be applied only with a calibrated boom to prevent over application. Operate equipment at spray pressures no greater than is necessary to produce a uniform spray pattern. Operate the spray boom no higher than is necessary to produce a uniformly overlapping pattern between spray nozzles. Do not apply with hollow cone-type insecticide nozzles or other nozzles that produce a fine droplet spray.

Aerial Application: To minimize spray drift, apply Starane Flex in a total spray volume of 3 gallons or more per acre. Drift potential is lowest between wind speeds of 2 to 10 mph. However, many factors, including droplet size and equipment type, determine drift potential at any given speed. Application should be avoided below 2 mph due to variable wind direction and high potential for temperature inversion. Spray drift from aerial application can be minimized by applying a coarse spray at spray boom pressure no greater than 30 psi; by using straight-stream nozzles directed straight back; and by using a spray boom that does not exceed 75% of wingspan or 90% of rotor diameter. Spray pattern and droplet size distribution can be evaluated by applying sprays containing a water soluble dye marker or appropriate drift control agents over a paper tape ( adding machine tape). Mechanical flagging devices may also be used.

Do not apply under conditions of a low level air temperature inversion.

A temperature inversion is characterized by little or no wind and air temperature that is lower near the ground than at higher levels. The behavior of smoke generated by an aircraft-mounted device or continuous smoke column released at or near site of application will indicate the direction and velocity of air movement. A temperature inversion is indicated by layering of smoke at some level above the ground and little o r no lateral movement.

Resistance Management

Management of Kochia Biotypes

Research has suggested that many biotypes of kochia can occur within a single field. Application of Starane Flex at rates below 13.5 fl oz per acre c a n result in a shift to more tolerant biotypes within a field.

Best Resistance Management Practice

Extensive populations of dicamba tolerant kochia have been identified in certain small grain and corn production regions (such as Chouteau, Fergus, Liberty, Toole, and Treasure counties in the state of Montana). In these areas, Starane Flex should be rotated with products that do not contain dicamba to minimize selection pressure. Unless recommended by Dow AgroSciences, do not use less than 13.5 fl oz of Starane Flex per a c re for control of ALS-resistant biotypes of kochia.

Application Directions

Application Timing

Apply Starane Flex early postemergence to actively growing weeds. Extreme growing conditions such as drought or near freezing temperatures prior to, at, or following time of application may reduce weed control and increase the risk of crop injury at all stages of growth. Only weeds that have emerged at the time of application will be controlled. If foliage is wet at the time of application, control may be decreased. Applications of Starane Flex are rainfast within 4 hours after application.

Spray Coverage

Use sufficient spray volume to provide thorough coverage and a uniform spray pattern. Do not broadcast apply in less than 3 gallons of total spray volume per acre. For best results and to minimize spray drift, apply in a spray volume of 10 gallons or more per acre. As vegetative canopy and weed density increase, spray volume should be increased to obtain equivalent weed control. Use only nozzle types and spray equipment designed for herbicide application. To reduce spray drift, follow precautions under Avoid Injurious Spray Drift.


Generally, this product does not require the use of an adjuvant to achieve satisfactory weed control. An adjuvant may be added to optimize herbicidal activity when applications are made at lower use rates or lower carrier volumes; under conditions of cool temperature, low relative humidity or drought; to small, heavily pubescent kochia; or when a tank mix partner recommends the use of an adjuvant. When an adjuvant is to be used with this product, Dow AgroSciences recommends the use of a C hemical Producers and Distributors Association certified adjuvant.

Limitations, Restrictions, and Exceptions

Wheat (Including Durum), Barley, Oats, Rye, Triticale

Apply 13.5 fl oz of Starane Flex per acre to actively growing wheat (including spring, winter and durum), barley, oats, rye and triticale from the 3-leaf crop growth stage up to flag leaf emergence (Zadoks scale 39). Apply when susceptible broadleaf weed seedlings and kochia are actively growing and less than 4 inches tall. Only weeds emerged at the time of treatment will be controlled. Best results are obtained from application made to seedling weeds.

Warm, moist growing conditions promote active weed growth and enhance the activity of Starane Flex by allowing maximum foliar uptake and contact activity. Weeds hardened off by cold weather or drought stress may not be adequately controlled or suppressed and re-growth may occur. For best results, ensure thorough spray coverage of target weeds.

Tank Mixes for Wheat (Including Durum): Starane Flex may be applied in tank mix combination with labeled rates of other products registered for postemergence application in wheat. See Tank Mixing Precautions under Mixing Directions. When tank mixing, do not exceed specified application rates and use only in accordance with the most restrictive precautions a n d limitations on the respective product labels.


- Livestock may be grazed on treated crops 7 days following application.

Refer in the label regarding weeds controlled and suppressed.


- Including herbicide-tolerant canola varieties except Clearfield (imidazolinone-tolerant) canola.

Kochia: Includes herbicide tolerant or resistant biotypes.

- Clearfield (imidazolinone-tolerant) canola.

Pre-Harvest Interval

60 days

Restricted Entry Interval

24 hours