General Information


Trifluralin 10G herbicide is a selective preemergence herbicide for control of many annual grasses and broadleaf weeds. The product must be mechanically incorporated within 24 hours after application to effectively control weeds. Trifluralin 10G controls susceptible weeds as they germinate. It does not control established weeds.


Applied according to directions and under normal growing conditions Trifluralin 10G will not harm the treated crop. Overapplication may result in crop injury or rotational crop damage from soil residue. Uneven application or improper incorporation can result in erratic weed control or crop injury. Seedling disease, cold weather, deep planting, excessive moisture, high salt concentration or drought may weaken crop seedlings and increase the possibility of damage. Under these conditions, delayed crop development or reduced yields may result.

Do not apply Trifluralin 10G to soils that are wet or are subject to prolonged periods of flooding as poor weed control may result.

Do not use Trifluralin 10G on any crop grown in Pacos County or Reeves County, Texas.

In Montana, uses of Trifluralin 10G are limited to those described in supplemental labeling. Refer to supplemental labeling for crops and specific use directions.

Application Directions

Soil Preparation

Trifluralin 10G may be applied to standing stubble or soil that has been pretilled.

Existing weeds and crop residues should be reduced to a manageable level using tillage so that Trifluralin 10G can be uniformly incorporated into the top 2 to 3 inches of the final seed bed. Soil surface conditions should allow Trifluralin 10G to be thoroughly and uniformly mixed into the top 2 to 3 inches of soil. If this is not possible, the soil should be tilled prior to application.

General Soil Conditions

The soil surface should be smooth enough to allow for uniform application and efficient incorporation of Trifluralin 10G. Apply when soil moisture is sufficient to allow breakup of large clods and uniform mixing during the incorporation process.

Soil compaction and / or nonuniform incorporation may occur when soil is excessively moist.


Trifluralin 10G may be applied with ground or aerial broadcast application equipment.

Apply only with equipment capable of accurate calibration and uniform application of herbicide granules. Apply at the recommended rate for soil texture class to be treated. Follow calibration directions provided by the equipment manufacturer.

Avoid releasing granules in narrow bands on the soil surface as this may cause crop injury.

Freezing will not adversely affect this product. If product is frozen at the time of application, agitate or thaw to restore free-flowing properties to Trifluralin 10G.

Soil Texture Guide for Application Rates

Trifluralin 10G rate recommendations for incorporated treatments are based on “Soil Texture Class” (coarse, medium or fine) and soil organic matter content. A fine textured soil (e.g., clay loam) will require a higher application rate that a coarse textured soil (e.g., loamy sand). In the table below, find the “Soil Texture Class” (coarse, medium or fine) corresponding to the soil texture to be treated. Choose the proper rate for each application based on the “Soil Texture Class” and the specific crop recommendations. Do not exceed recommended rates.

- Silty clay loam and sandy clay loam soils are transitional soils and may be classified as either medium or fine textured soils. If silty clay loam or sandy clay loam soils are predominantly sand or silt, they are usually classified as medium textured soils. If they are predominantly clay, they are usually classified as fine textured soils.

Application Rate Ranges

Where a rate range is shown, use the lower rate for coarser textured soils or soils with low organic matter content. Use the higher rate in the rate range for finer textured soils and on soils containing more than 5% organic matter. Where soil texture is variable within the same field, use the lower recommended Trifluralin 10G rate.

Application Timing

Spring Application

Apply Trifluralin 10G any time after January 1 when soil can be worked and is in condition suitable for good incorporation. See “Approved Crops” section for recommendations on specific crops.

Fall Application

Application Timing: In California, Minnesota, North Dakota and South Dakota, apply Trifluralin 10G any time between September 1 and December 31. In all other states, fall apply Trifluralin 10G any time between October 15 and December 31.

Application Rates for Fall Application: Refer to the “Approved Crops” section of the label for specific rate recommendations. Increased rates for fall application are recommended for certain crops grown in certain geographic areas. For crops for which there are no specific fall application instructions, and for which Trifluralin 10G is recommended as a preplant incorporated treatment, use the rates listed for spring applications. In areas receiving greater than 20 inches total average annual rainfall and irrigation, use the higher rate in the recommended rate range. Do not apply Trifluralin 10G prior to planting sugar beets, potatoes and direct seeded tomatoes the following spring.

Ground may be left flat or bedded-up over winter. On bedded ground, knock beds down to desired height before planting, moving some treated soil from beds into furrows. Where soil is left flat over winter, be careful not to turn up untreated soil during spring bedding operations. Destroy established weeds during seed bed preparation.

Prior to planting, destroy any weeds which have become established in furrows due to uncovering of untreated soil. Do not apply Trifluralin 10G in the fall to soils that are wet or subject to prolonged periods of flooding, or where rice has grown the previous year.

Incorporation Directions

Trifluralin 10G requires two incorporation passes. The first should occur within 24 hours after application. For best weed control results, the second incorporation should be delayed 3 to 5 days after the first and be completed prior to planting. A minimum delay of 7 days after the first incorporation is recommended for certain Trifluralin 10G uses in small grains. See specific use directions. The second incorporation pass should occur in a different direction than the first. Use incorporation equipment capable of thoroughly and uniformly mixing Trifluralin 10G into the top 2 to 3 inches of the final seedbed. Erratic weed control may result if untreated soil is moved to the surface during the second incorporation pass. To avoid this problem, set equipment so that the second incorporation pass is not deeper than the first.

Incorporation to Established Crops

Trifluralin 10G may be applied and incorporated in certain established crops. Refer to the “Approved Crops” section of the label for specific incorporation directions.

Incorporation in Bedded Culture

For optimum weed control, Trifluralin 10G should be incorporated into the top 2 to 3 inches of the final seedbed.

Application Prior To Bedding

Apply and make first incorporation with recommended equipment. The bedding operation serves as the second incorporation. Do not expose untreated soil during post-bedding operations.*

Application after Bedding

Knock off beds to planting height before applying. Apply Trifluralin 10G and incorporate with recommended equipment that will conform to the bed shape. Do not leave untreated soil exposed.*

*Avoid removal of untreated soil from the seedbed before or during the planting operation.

Exposure of untreated soil will allow weeds to germinate in the drill row.

Cultivation After Planting

Areas treated with Trifluralin 10G may be shallowly cultivated without loss of weed control activity. Avoid deep cultivation that could bring untreated soil to the soil surface and result in loss of weed control.

Recommended Incorporation Equipment

Any recommended incorporation implement may be used alone or in combination with any other recommended implement. Two incorporation passes are necessary unless otherwise specified. The second incorporation should not be deeper than the first.

Tandem Disc: Set to cut 4 to 6 inches deep and operate at 4 to 6 mph.

Field Cultivator: Set equipment to cut 3 to 4 inches deep and operate at 5 or more mph.

A field cultivator is defined as an implement with 3 to 4 rows of sweeps, spaced at intervals of 7 inches or less and staggered so that no soil is left unturned. Chisel points should not be used.

Chisel Plow: (For use in northern Great Plains). The chisel plow may be used for the first incorporation pass only. Any other recommended incorporation implement may be used for the second pass for row crops. The chisel plow may be used for any tillage or incorporation pass in the Summer Fallow program. Operate chisel plow 4 to 5 inches deep at 4 to 6 mph. A chisel plow is defined as having 3 rows of 14 to 18-inch sweeps spaced no more that 12 inches apart. Sweeps should be staggered so that no soil is left unturned. Chisel points should not be used.

Combination Seedbed Conditioners: These implements are defined as three or more tillage devices combined to operate as a single tillage unit. For example, 2 to 3 rows of field cultivator C- or S-shaped shanks with an effective sweep spacing of 6 to 9 inches (staggered so that no soil is left unturned), followed by a spike-tooth or flextine harrow, followed by a ground driven reel or basket. Combination implements should be set to cut 3 to 4 inches deep and operated at a minimum speed of 6 mph. Trifluralin 10G can be incorporated with one pass when using a combination seedbed conditioner. Two incorporations are required under conditions which prevent optimum soil mixing such as excessive trash, roughness, high clay content or soil moisture.

Rolling Cultivator: Set to cut 2 to 4 inches deep and operate at 6 to 8 mph. Rolling cultivators are adequate for use on coarse and medium textured soils only.

Mulch Treader (other similar disc-type implements): Set to cut 3-4 inches deep and operate at 5 to 8 mph.

P.T.O. Driven Equipment (tillers, cultivators, hoes): Adjust to incorporate Trifluralin 10G into the top 2 to 3 inches of the seedbed with rotors spaced to provide a clean sweep of the soil. Only one incorporation is necessary. P.T.O. driven equipment should not be operated at a speed greater than 4 mph.

Other Equipment: Other implements including a flexible tine-tooth harrow (Flextine or Melroe), sweep-type cultivator or rolling cultivator are recommended, but only for certain uses defined in the “Approved Crops” section of the label.

Limitations, Restrictions, and Exceptions

BEANS, LIMA AND SNAP: Apply and incorporate Trifluralin 10G before planting.

- All soils with 2-5% organic matter—7.5%.

Restricted Entry Interval

12 hours

EXCEPTION: If the product is soil-incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated.