Voucher Herbicide is a selective postemergence product for control of annual and perennial broadleaf weeds and volunteer potatoes in wheat, barley, or oats not underseeded with a legume, fallow cropland and on-farm non-cropland uses such as fence rows, building perimeters, around irrigation equipment and roadways.
Application Precautions and Restrictions
Do not apply this product directly to, or otherwise permit it to come in direct contact with, susceptible crops or broadleaf plants including alfalfa, cotton, lettuce, edible beans, lentils, peas, potatoes, radishes, soybeans, sugar beets, sunflowers, tomatoes, tobacco, grapes, legumes, fruit trees, canola, tame mustard, other vegetables or ornamentals. Vapors from this product may injure susceptible plants in the immediate vicinity. Avoid applications where proximity of susceptible crops or other susceptible broadleaf plants is likely to result in exposure to spray or spray drift.
Do not contaminate irrigation ditches or water used for domestic purposes.
Do not apply in greenhouses.
Maximum Application Rate: Do not apply more than 35 fl. oz. of Voucher Herbicide (0.178 lb. ae fluroxypyr plus 0.71 lb. ae MCPA) per acre per growing season.
Plant-back Restriction: Plant only those crops listed on this label or Federally approved supplemental labeling for Voucher Herbicide within 120 days following application. For crops not listed on an MCPA label, or on crops for which no residue tolerances for MCPA have been established, a 1-year plantback interval must be observed.
Chemigation: Do not apply this product through any type of irrigation system. Management of Kochia Biotypes: Research has suggested that many biotypes of kochia can occur within a single field. While kochia biotypes can vary in their susceptibility to Voucher Herbicide, all will be suppressed or controlled by the 1 ½ pint labeled rate. Application of Voucher Herbicide at rates below the 1 ½ pint rate can 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, Voucher Herbicide should be applied at a minimum rate of 1 ½ pints per acre for optimal control of dicamba-tolerant kochia. In addition, Voucher Herbicide should be rotated with products that do not contain dicamba to minimize selection pressure. Use of these practices will preserve the utility of Voucher Herbicide for control of dicamba-tolerant kochia biotypes.
Spray Drift Management
Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many equipment- and weather-related factors determines the potential for spray drift. The applicator and the grower are responsible for considering all these factors when making decisions.
Apply only as a medium or coarser spray (ASAE standard 572) or a volume mean diameter of 300 microns or greater for spinning atomizer nozzles.
Apply only when wind speed is 2-10 mph at the application site.
The following drift management requirements must be followed to avoid off-target drift movement from aerial applications to agricultural field crops. These requirements do not apply to forestry applications, public health uses or to applications using dry formulations.
1. The boom length must not exceed 75% of the wingspan or 90% of the rotor blade diameter.
2. Release spray at the lowest height consistent with efficacy and flight safety. Do not release spray at a height greater than 10 feet above the crop canopy.
3. Nozzles must always point backward parallel with the airstream and never be pointed downwards more than 45 degrees. Where states have more stringent regulations, they must be observed.
When applications are made with a crosswind, the swath will be displaced downwind. The applicator must compensate for this displacement at the downwind edge of the application area by adjusting the path of the aircraft upwind. Do not make applications into temperature inversions.
The applicator should be familiar with and take into account the information covered in the following Aerial Drift
Reduction Advisory Information:
To minimize spray drift, apply Voucher Herbicide in a total spray volume of 8 or more gallons 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 patter between spray nozzles. Do not apply with hollow cone-typeinsecticide nozzles or other nozzles that produce a fine-droplet spray. Do not apply with a nozzle height greater than 4 feet above the crop canopy.
Application Timing: Apply to actively growing weeds. Extreme growing conditions such as drought or near freezing temperatures prior to, at and following time of application may reduce weed control and increase the risk of crop injury at all stages of growth. Only weeds that are emerged at the time of application will be affected. Foliage that is wet at the time of application may decrease control.
Voucher Herbicide applications are rain-fast within 1 hour after application.
Application Rates: Generally, application rates at the lower end of the rate range will be satisfactory for young, succulent growth of sensitive weed species. For less sensitive species, perennials, and under conditions where control is more difficult (plant stress conditions such as drought or extreme temperatures, dense weed stands and/or larger weeds), the higher rates within the rate range will be needed. Weeds growing in the absence of crop competition generally require higher rates to obtain satisfactory control or suppression.
Effect of Temperature on Herbicidal Activity: Herbicidal activity of Voucher Herbicide is influenced by weather conditions. Optimum activity requires active crop and weed growth.
The temperature range for optimum herbicidal activity is 55°F to 75°F. Reduced activity will occur when temperatures are below 45°F or above 85°F. Frost before application (3 days) or shortly after (3 days) may reduce weed control and crop tolerance.
Coverage: For best results, apply in 3 or more gallons per acre by air or in 8 or more gallons per acre by ground equipment. Do not exceed 40 gallons per acre total spray volume. Use sufficient spray volume to provide thorough coverage and a uniform spray pattern. Inadequate spray volume and coverage may result in decreased weed control. Ascrop canopy and weed density increase, spray volume should be increased to obtain equivalent weed control. Use larger nozzle tips or decrease spraying speed to increase spray volume rather than increasing boom pressure. Refer to manufacturer's recommendations for information on relationships between spray volume, and nozzle size and arrangement.
Adjuvants: Use of a high-quality adjuvant labeled for use on growing crops is suggested for improved weed control. Adjuvants are especially beneficial when applications are made (a) at lower carrier volumes, (b) under conditions of cool temperature, low relative humidity or drought, or (c) to small, heavily pubescent kochia. When an adjuvant or a specific adjuvant product (such as a drift control agent) is to be used with this product, use a Chemical Producers and Distributors Association (CPDA) certified adjuvant.
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