General Information


Local conditions, crop varieties, and application method may affect performance of this product. User should consult local Extension Service, agricultural experiment station, or university weed specialists, and State regulatory agencies for recommendations in your area.

NOTE: Certain counties in California may have specific permit requirements and restrictions that need to be adhered to prior to and during the application of phenoxy herbicides. It is the responsibility of the end user, applicator, and/or pest control advisor (PCA) to be fully aware of any and all county permit conditions regarding the use and application of phenoxy herbicides. All restrictions dates, buffer zones to sensitive crops, required drift control measures and any other requirements are the sole responsibility of the purchaser, end user, applicator or PCA.

Best results are obtained when product is applied to young succulent weeds that are actively growing. Application rates lower than recommended will not be satisfactory on susceptible annual weeds. For perennial weeds and conditions such as the very dry areas of the western states, where control is difficult, the higher recommended rates should be used. When product is used for weed control in crops, the growth stage of the crop must be considered. Some plants and weeds, especially woody varieties, are hard to control and may require repeat applications. Application rates should be 1 to 5 gallons of total spray by air or 5 to 25 gallons by ground equipment unless otherwise directed. In either case, use the same amount of UNISON per acre. UNISON should not be allowed to come into contact with desirable, susceptible plants such as beans, cotton, fruit trees, grapes, legumes, ornamentals, peas, tomatoes and other vegetables.

UNISON should not be used in greenhouses. If stored below freezing, it may be necessary to warm product to 40ºF and agitate before using. This does not affect the efficiency of the product. Spray equipment used to apply UNISON or other products containing 2,4-D should not be used for any other purpose until thoroughly cleaned with a suitable chemical cleaner.

NOTE: California Aerial Restriction: In California, aerial application is allowed on small grains only. All other crops application by air is prohibited.

Western States Aerial Restrictions: Application of UNISON is prohibited between February 1st and September 15th in the following Western United States (AZ, NM, NV).


Use calibrated spray equipment for all types of applications to assure applying the recommended amount of spray mixture per acre. Use sufficient spray volume within the ranges specified to obtain good coverage of weeds. UNISON is absorbed sufficiently within 1 hour after application to provide adequate weed control.

Ground Broadcast Spray: Unless otherwise specified in the appropriate crop or non-crop directions, apply in 5 or more gallons of spray solution per acre. Use enough spray volume to provide uniform coverage of weeds, taking into account the amount of vegetation present and the type of application equipment to be used. As crop canopy and weed density increase, a higher spray volume may be needed for equivalent coverage and weed control. Typical crop applications utilize 10 to 50 gallons of spray solution per acre, while certain high volume non-crop applications may utilize more than 100 gallons per acre. Use coarse sprays to minimize potential spray drift. Do not apply with hollow cone nozzles or other nozzles that produce fine spray droplets. Boom spraying with flat fan or low volume nozzles is generally most suitable for ground broadcast applications.


Labeled Crops: Within 29 days following an application of this product, plant only those crops named as use sites on this or other registered 2,4-D labels. Follow more specific limitations, if any, provided in the directions for individual crops. Labeled crops may be at risk for crop injury or loss when planted soon after application, especially in the first 14 days. Degradation factors described below should be considered in weighing this risk.

Other Crops: All other crops may be planted 30 or more days following an application without concern for illegal residues in the planted crop. However, under certain conditions, there may be a risk of injury to susceptible crops. Degradation factors described below should be considered in weighing this risk. Under normal conditions, any crop may be planted without risk of injury if at least 90 days of soil temperatures above freezing have elapsed since application.

Degradation Factors: When planting into treated areas, the risk of crop injury is less if lower rates of product were applied and conditions following application have included warm, moist soil conditions that favor rapid degradation of 2,4-D. Risk is greater if higher rates of product were applied and soil temperatures have been cold and/or soils have been excessively wet or dry in the days following application. Consult your local Agricultural Extension Service for information about susceptible crops and typical soil conditions in your area.

Limitations, Restrictions, and Exceptions

SOYBEANS (Preplant Only) (Not Registered for Use in California)

Apply not less than 15 days prior to planting soybeans, when weeds are small and actively growing. Use the higher rate on larger weeds and when perennials are present. Limited to two (2) applications.

In addition to those weeds found on the GENERAL WEED LIST, UNISON will suppress or control the following broadleaf weeds frequently encountered in reduced tillage soybean production systems: alfalfa*, bullnettle, smallflowered bittercress, Carolina geranium, smallflowered buttercup, common and rough cinquefoil, red clover*, horseweed or marestail, mousetail, wild mustard, field pennycress. cutleaf evening primrose, common purslane. speedwell, velvetleaf, and Virginia copperleaf*. These weeds are only partially controlled. Apply no more than 2.0 pints of UNISON in one season prior to planting soybeans. After applying, plant soybean seed as deep as practical or at least 1-112 to 2 inches deep, Adjust the planter press wheel, If necessary, to ensure that planted seed is completely covered. If desired, UNISON may be applied pre-plant to soybeans in lank mixtures with other herbicides such as Poast, Poast Plus, Roundup, Roundup D-Pak, Honcho, Gramoxone Extra, Prowl. Pursuit Plus, Scepter, Scepter 70 DC, Squadron and others that are registered for re-plant soybean use.

NOTE: Unacceptable injury to soybeans planted in fields previously treated with UNISON may occur and the extent of injury will depend on weather and agronomic factors such as the amount of weed vegetation and previous crop residue present that may be in effect between the time of application and the emergence of the soybean plant.


Preplant for Two ( 2) applications per crop cycle

- Limited to 2 preplant applications per crop cycle.

- Maximum of 36 ounces per acre per preplant application.

- Apply not less than 30 days prior to planting soybeans.

- Do not apply UNISON when weather conditions such as temperature, air inversions, or wind favor drift from treated areas to susceptible plants.

- Do not apply UNISON prior to planting soybeans if you are not prepared to accept the results of soybean injury including possible loss of stand and yield.

- Do not replant fields treated with UNISON in the same growing season with crops other than those labeled for 2, 4-D preplant use.

- Do not mow or cultivate weeds prior to treating with UNISON as poor control may result.

- Do not cut for feed treated hay, forage, or fodder or graze treated soybeans to livestock.

- Do not apply UNISON pre-plant to soybeans in fields having a coarse-textured soil where the percent organic matter is <1.0%.

- Do not feed treated hay, forage or fodder. Livestock should be restricted from feeding/grazing of treated cover crops.

- Not currently registered for use In California.

Restricted Entry Interval

48 hours