WINTER WHEAT - ANNUAL GRASS - COARSE
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.
GENERAL USE PRECAUTIONS
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.
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.
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.
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.
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.
SMALL GRAINS (BARLEY, DURUM AND WHEAT)
Special Precautions for Use of Trifluralin 10G on Small Grains
Carefully follow directions for use of Trifluralin 10G on small grains to minimize potential crop stress. Under certain conditions, delayed crop emergence and/or stand reduction may occur when Trifluralin 10G is applied to barley, durum or wheat. The combined effect of certain cultural practices and unfavorable soil or environmental conditions may cause excessive crop seedling stress resulting in retarded crop growth, stand reduction and possibly reduced yield.
For best results, observe the following cultural practices or precautions:
Use tillage methods that provide a uniformly firm seedbed and time tillage operations to conserve moisture.
If irrigation is used, irrigate prior to planting or after germination and emergence.
Moisture received between planting and emergence may cause crusting, especially on loose, friable seedbeds.
Do not exceed recommended application rates for Trifluralin 10G. This is particularly important on coarse textured or low organic matter soils.
Carefully follow incorporation directions. When applying preplant incorporated treatments, operate equipment at recommended depth and speed to place Trifluralin 10G
into the upper 1 to 1.5 inches of soil. If applied after planting, set equipment so as to not disturb planted seed.
Set drills to place seed at a depth of 1 to 2 inches. A planting depth greater than 2.5 inches for spring wheat or durum will result in increased seedling stress and decreased emergence.
Use only high quality seed where Trifluralin 10G is to be applied (avoid use of small seed with low starch reserves).
If seed treatments are used, apply at the correct rate and uniformly across all seeds.
Misapplication may result in reduced germination and/or seedling vigor.
Avoid use of seed varieties known to have poor seedling (emergence) vigor.
Do not fall apply Trifluralin 10G in combination with any other preplant incorporated herbicide.
Soil characteristics and environmental conditions which may contribute to crop seedling stress that may be accentuated by use of Trifluralin 10G include:
Soil related: High salinity, eroded knolls/hilltops, loose dry soils and compaction.
Weather related: Cold and/or wet soils, excessively hot soils, excessive moisture, drought, and soil crusting from heavy rainfall.
Note: Do not apply Trifluralin 10G on small grains where a dinitroaniline herbicide such as Trifluralin 10G was applied at a rate recommended for row crops (oil seeds) during the previous growing season.
Populations of green foxtail (pigeongrass) resistant to the dinitroaniline (DNA) class of herbicides have been identified in Bottineau, McHenry, Montrail, Ramsey, Renville, Rolette, Towner and Ward counties of North Dakota in fields which have a long history of dinitroaniline herbicide use.
Trifluralin 10G will not control green foxtail which has developed DNA resistance.
Therefore, the grower assumes the risk of nonperformance due to DNA resistance if Trifluralin 10G is used to control green foxtail in spring cereal grain production areas of North Dakota. Alternative green foxtail control practices should be utilized in these fields. To prevent or delay the development or spread of DNA-resistant green foxtail in spring cereal production areas, utilize the following management practices:
1. Rotate herbicides so that the same product or same class of herbicide is not used repeatedly year after year. Trifluralin 10G and/or other dinitroaniline herbicides should not be applied in consecutive years. Use other herbicides with different modes of action such as Tiller, Hoelon, Dakota, or Stampede in alternate years.
2. Rotate crops and use alternative weed control methods, including tillage, fallow periods and/or other herbicides with different modes of action.
3. Thoroughly clean small grains harvested from fields with confirmed resistance before using as seed, or avoid using grain from DNA-resistant fields for seed.
4. Thoroughly clean all crop residues from tillage and harvesting equipment before moving out of fields with confirmed resistance.
Incorporation Directions and Equipment for Small Grains: Use incorporation equipment in the manner described below unless otherwise specified in use directions.
Any of the following implements listed below may be used for the first incorporation of Trifluralin 10G. Use only the disc or field cultivator for the second incorporation pass and incorporate in a different direction. Poor weed control may result if untreated soil is
moved to the surface during the second incorporation pass. To avoid this problem, the second incorporation should not be deeper than the first.
Chisel Plow: May be used for the first incorporation pass only. Operate at 4 to 5 inches deep and 4 to 6 mph. A chisel plow is defined as having 3 rows of 14 to 18 inch sweeps on no greater than 12 inch centers. Stagger sweeps so that no soil is left unturned. Use of chisel points may result in inadequate soil mixing.
Tandem Disc: Operate at 3 to 4 inches deep and at 4 to 6 mph.
Field Cultivator: Operate at 3 to 4 inches deep and at 5 or more mph. A field cultivator is defined as having 3 to 4 rows of sweeps with “c” or “s” shaped shanks on no greater than 7 inch centers. Stagger sweeps so that no soil is left unturned.
Application Directions for Small Grains
Winter Wheat—Fallow Soil Application of Trifluralin 10G for Annual Grass Control Prior to Planting
(For Use in Colorado, Idaho, Kansas, Nebraska, Oregon, and Washington)
Apply and shallowly incorporate Trifluralin 10G up to 4 months before planting to control cheatgrass and certain other annual grasses and broadleaf weeds during the fallow period and during the following growing season. Apply any time from May to September prior to fall planting of winter wheat.
Incorporation Directions: Incorporate Trifluralin 10G with a flexible tine-tooth harrow (Flextine or Melroe), set to cut 1 to 2 inches deep and operated at 3 to 6 mph.
Thorough incorporation requires 2 incorporation passes over the field in different directions.
Incorporate 1 time within 24 hours after application. A second incorporation pass prior to planting should occur at least 5 days after the first. Do not till the soil with a disc after Trifluralin 10G has been incorporated with a flexible tine harrow.
Planting Directions: Use only a deep furrow or semi-deep furrow drill that will place the seed below the zone into which Trifluralin 10G has been incorporated.
Precaution: Do not plant wheat directly into the zone of soil treated with Trifluralin 10G as crop injury (delayed emergence or stand reduction) may occur. Delayed emergence or slight stand reduction does not normally affect yield.