ESTABLISHMENT OF HERBICIDAL FIREBREAKS - ANNUAL WEEDS
Alligare Tebuthiuron 80 WG is a surface applied, soil-active product intended for total vegetation control in non-cropland and for woody plant control in non-cropland, rangeland and permanent pastures. Applied as a broadcast treatment, Alligare Tebuthiuron 80 WG is generally non-selective to (will control) annual grasses, annual and perennial broadleafs and broadleaf woody plants. Perennial warm-season grasses are generally tolerant to Alligare Tebuthiuron 80 WG, but may exhibit injury during the season following application. Cool season perennial grasses are not tolerant to broadcast applications of this product except at rates less than 0.5 lb active ingredient.
Applied as a banded treatment, Alligare Tebuthiuron 80 WG may be used to control woody plants in non-cropland, rangeland and pasture sites. With banded treatments, effects of herbaceous vegetations are confined mainly to the treated band, but may last more than one growing season. Dormant season application and keeping the treated band as narrow as possible is recommended to minimize herbicidal effects on perennial grasses and to lessen effects on other herbaceous plants.
Treatments become effective after sufficient rainfall has occurred to move the active ingredient in Alligare Tebuthiuron 80 WG into the root zone. Herbicidal symptoms appear more rapidly when applied just before seasonal rainfall. Susceptible herbaceous plants exhibit leaf chlorosis followed by browning before the plant dies. Woody plants exhibit leaf chlorosis and browning followed by defoliation. Woody plants may undergo several defoliation cycles, usually following significant rainfall before death occurs. Time required to achieve control of woody vegetation depends on susceptibility of target species, rainfall and soil conditions and may vary from a single growing season to several years. Lack of rainfall will delay herbicidal activity and lengthen the time required for control.
For best woody plant control results with Alligare Tebuthiuron 80 WG, do not disturb intact plants by practices such as wood cutting, chaining, or burning for two years after application. Resprouting or survival of woody plants is more likely to occur if plants are disturbed before complete control occurs.
Use Precautions and Restrictions
Read the entire label before using Alligare Tebuthiuron 80 WG to determine if this product is suitable for the desired purpose.
Not for sale, distribution, or use in Nassau and Suffolk Counties in New York State This product is not registered in the state of Florida.
Not for Residential Use.
Alligare Tebuthiuron 80 WG is an extremely active herbicide which will kill trees, shrubs, and other forms of desirable vegetations having roots extending into the treated area. Feeder roots of many species of desirable vegetation extend many feet beyond the drip line of the branches, and a very small amount of Alligare Tebuthiuron 80 WG in contact with one feeder root of a tree, shrub, or other desirable vegetation may cause serious injury or death to the entire plant.
Recommended Treatment Setback: Do not apply Alligare Tebuthiuron 80 WG in the vicinity of desirable plants. Exposure of even a small part of a plant root system to Alligare Tebuthiuron 80 WG may cause severe plant injury or death. Plant roots usually occupy an area much larger than the aerial portion of the plant. Treatment setback distance should be 2 times the height or width of adjacent non-target vegetation, whichever is greater. For example, if adjacent non-target vegetation is 25 feel tall, the treatment setback should be 50 feet.
An Arborculturist (tree expert) should be consulted to help you to determine if the area of proposed application is free of all roots of desirable vegetation. The effect of Alligare Tebuthiuron 80 WG on desirable vegetation may be irreversible and its presence in the soil may prevent growth of other desirable vegetation for some years after application.
Do not use Alligare Tebuthiuron 80 WG on areas such as walks, driveways, streets, lawns, patios, tennis courts, swimming pools, cemeteries, or other landscaped areas, or under asphalt or concrete pavement where future landscaping is planned. Do not apply on field crops. Do not apply on any area into which the roots of field crops or other desirable vegetations may extend. Roots of trees, shrubs, and other desirable vegetations may extend far beyond the drip line of the plant’s branches.
Avoid non-target drift or product movement. Do not apply when winds are gusty or under any other condition which will allow drift or product movement. Do not apply to areas where soil movement by water erosion and/or natural or mechanical means is likely. Avoid treatment or areas susceptible to wind erosion such as single grain sands or disturbed soils that are loose and powdery dry. Under these conditions, treatment should be delayed until the soil surface has been stabilized by rainfall or irrigation. Before treatment of sandy soils in areas subject to wind erosion, the soil surface should first be stabilized with gravel mulch or other means of preventing physical movement of surface soil. Drift or any form of product movement from treated areas may cause damage to any vegetation to which treatment is not intended.
Do not apply Alligare Tebuthiuron 80 WG to interior ditchbanks (areas which slope toward the drainage). Do not apply to ditches used to transport irrigation to potable water.
Thoroughly clean all traces of Alligare Tebuthiuron 80 WG from application equipment after use. Do not empty residues cleaned from application equipment on areas where they may come in contact with the roots of desirable vegetation or the water source for such vegetation.
Alligare Tebuthiuron 80 WG may injure or suppress certain herbaceous vegetation in the treated area. Therefore, do not apply where such injury cannot be tolerated. Do not apply broadcast applications of Alligare Tebuthiuron 80 WG where forage or maintenance of grass cover is desired. Injury to most herbaceous perennials is reduced if Alligare Tebuthiuron 80 WG is applied when this vegetation is dormant.
Grazing Haying Restrictions
If the treated area is to be used for haying or grazing, do not apply more than 5 pounds per acre of Alligare Tebuthiuron 80 WG, and do not apply the product more than once a year. There are no grazing restrictions following band or individual plant treatment application of Alligare Tebuthiuron 80 WG at 5 pounds per acre or less.
Haying Restriction: In areas receiving band or individual plant treatments of 5 pounds per acre or less of Alligare Tebuthiuron 80 WG, grass may be cut for hay one year after application.
Frequency of Application and Maximum Use Rates
Vegetation Control by Ground Broadcast or Banded Application:
- The maximum use rate and frequency of application is 1.25 to 2.5 lb of Alligare Tebuthiuron 80 WG (1 to 2 lb a.i.) per acre once every three years for vulnerable sites where soils are sandy and depth to water table is shallow. (Refer to Environmental Hazards section under Use Restrictions for Ground Water Protection.)
- For all other areas, the maximum use rate and frequency of application is up to 5 lb. of Alligare Tebuthiuron 80 WG (4 lb a.i.) per acre once every three years; and no more than two treatments totaling 7.5 lb of Alligare Tebuthiuron 80 WG (6 lb a.i.) per acre in any 6 year period.
Total Vegetation Control and Maintenance of Bare Ground by Ground Broadcast Only: The maximum use rate and frequency of application is up to 5 lb of Alligare Tebuthiuron 80 WG (4 lb a.i.) per acre applied only once per year; however, no more than 7.5 lb of Alligare Tebuthiuron 80 WG (6 lb a.i.) per acre may be applied in any 3 year period.
Spot treatments (Hand-held Equipment): May be applied at rates up to 7.5 lb of Alligare Tebuthiuron 80 WG (6 lb a.i.) per acre when needed.
Apply Alligare Tebuthiuron 80 WG in a spray volume of 5 or more gallons of water per acre by ground. Apply before or during the period of active growth of plants to be controlled. Initial control is enhanced by rainfall.
In areas of low annual rainfall (less than 15 inches per year) Alligare Tebuthiuron 80 WG should be applied prior to the time of year when the predominant portion of that rainfall occurs. A minimum of 1 to 1 1/2 inches of rainfall is required to activate Alligare Tebuthiuron 80 WG and place it in the zone of weed seed germination.
Other products registered for use on the site to be treated may be applied in tank mix combination with Alligare Tebuthiuron 80 WG to provide broader spectrum weed control or provide initial top kill of existing vegetation. Consult the manufacturer’s label for additional weeds controlled, directions for use, cautions and limitations before use. See detailed information for tank mixing in the General Information section of the label.
Banded Application (Ground Application Only)
Banded applications of Alligare Tebuthiuron 80 WG allow for woody plant control and preservation of grasses and other desirable herbaceous vegetation in rangeland and permanent pastures and in non-cropland areas (such as utility, railroad, and pipeline rights-of-way and fencerows). In banded applications, the rate per acre is equivalent to the broadcast rate, but the herbicide is concentrated into individual herbicide bands spaced 4 to 10 feet apart.
Banded applications may be made using a spray volume of 5 or more gallons per acre. Actual herbicide bands should be kept as narrow as possible during application to minimize potential injury or loss of herbaceous vegetation. In areas such as brush-infested fencerows, a single band may be applied. Control is dependent upon root systems intercepting the herbicide in soil beneath treated bands.
Band spacing should be selected based on the size of the woody plants in the area to be treated and the amount of injury or loss of herbaceous vegetation that can be tolerated. Where control of young or seedling plants is desired, bands should be spaced closer together. This will achieve maximum exposure to their limited root systems. Where larger more mature woody plants are to be controlled, bands should be spaced at the wider end of the recommended spacing range.
In addition to allowing adequate exposure of the more extensive root systems of these larger woody species for control, use of the wider spacings will further reduce injury or loss of herbaceous vegetation within the treated band.
Within the treated band nearly all vegetation, woody and herbaceous, will be killed. Some herbaceous vegetation close to the treated band with roots extending into it may be severely injured or killed. However, since root systems of herbaceous plants are less extensive most plants outside the treated band are unaffected.
When banded applications are made in an area where straight stream nozzles are positioned more than 5 feet above the soil surface or where woody plant foliage is dense, breakup of individual nozzle steams may occur. If conditions do not permit delivery of intact nozzle streams to the soil surface, efficacy may be reduced and injury of herbaceous vegetation will increase. For this reason, application in the dormant season when there is minimum foliage present is recommended. To avoid breakup of individual nozzle streams by interfering vegetation, applicators may also employ mechanical means to position spray nozzles close to the soil surface such as protected drop nozzles mounted at the end of weighted bars which maintain constant contact the soil surface.
Fencerow Applications: For fencerow applications, a single spray band will cover a fencerow 4 to 10 feet wide. Use a rate appropriate to control the most difficult species to control in the fencerow. Use a straight stream nozzle and direct the nozzle stream at the soil surface in the center of the fencerow. For fencerows wider than 10 feet, separate bands may be applied on either side of the fencerow.
Rate example: Assuming the desired rate of Alligare Tebuthiuron 80 WG is 5 pounds per acre and the fencerow is 10 feet wide, 5 pounds of Alligare Tebuthiuron 80 WG will treat 4356† linear feet of fencerow. Determine the delivery rate for the nozzle at the desired spray pressure and the walking speed of the applicator. If the length of the area to be treated is 4356 ft long and walking speed is 3 mph (264 ft/minute) it would take 16.5 minutes to walk the length of the treatment area. If the delivery rate of the nozzle is 0.6 gallons per minute, the treatment would require approximately 10 gallons (0.6 gallon per minute X 16.5 minute =10 gallons) of spray solution.
†1 acre = 43560 sq ft (43560 sq ft ÷ 10 ft = 4356 ft)
Individual Plant Treatment
ATTENTION: Do not use this treatment method in any area where there are desirable species in close proximity plants to be eliminated. A small amount of Alligare Tebuthiuron 80 WG in contact with the roots of desirable trees or other woody species may cause severe injury or death. See Use Precautions and Restrictions section for precautions for avoiding damage to non-target plants.
Alligare Tebuthiuron 80 WG may be applied in high or low volumes of water for selective control of individual woody plants. Recommended rates will vary depending upon site conditions, with the higher rates needed for difficult to control species, large plants, heavier soils, fall applications and cut brush. Refer to Factors in Herbicidal Response of Woody Plants section for further information.
For high volume applications, mix 1 pound of Alligare Tebuthiuron 80 WG in enough water to make 10 gallons of solution. Apply 10 ounces of material to the soil per every 2 to 4 inches of stem diameter.
For low volume applications, mix 1 pound of Alligare Tebuthiuron 80 WG in enough water to make 1 gallon of solution. Apply 1 ounce of material to the soil per very 2 to 4 inches of stem diameter.
When treating large stems, apply the multiple treatments (spots or bands) in even spacing around the stem.
Two types of equipment are suggested for applying Alligare Tebuthiuron 80 WG using banded or individual plant treatment methods: the Solo Model 425 back pack sprayer (or equivalent) for both banding and individual plant treatment, and the Spot Gun for individual plant treatment.
The Solo sprayer is prepared for spraying by adding the pre-slurried contents of 4 pounds of Alligare Tebuthiuron 80 WG and water to the tank. Fill to capacity with additional water and shake vigorously. Equip the Solo sprayer with a 0003-SS straight stream nozzle and the Solo pressure regulator with the green (10 psi) pressure limiting spring. To band Alligare Tebuthiuron 80 WG at 5 pounds per acre, walk at 3 mph (264 feet per minute) with the Solo on continuously and space the bands 5 feet apart. Adjust the rate and walking speed according to the brush species and conditions encountered. For individual plant treatment with the Solo, apply a 1.5 second shot for every 1 to 2 inches of stem diameter at the base of unwanted woody plants.
The Spot Gun is prepared for individual plant treatment by mixing 2 pounds of Alligare Tebuthiuron 80 WG in sufficient water to obtain 1 gallon of spray solution. Set the Spot Gun to deliver 8 milliliters of this solution for every 1 to 2 inches of stem diameter at the base of the unwanted woody plants. For application on steep slopes or other sensitive areas, the Spot Gun can be equipped with a soil probe to inject the Alligare Tebuthiuron 80 WG solutions beneath the soil surface. Placement at a soil depth of 2 to 4 inches will eliminate any surface movements and reduce injury to herbaceous vegetation.
At the prescribed rates, 4 pounds of Alligare Tebuthiuron 80 WG will treat approximately 950 stems 1 to 2 inches in diameter. Because of its non-volatile nature and low potential for drift, this Alligare Tebuthiuron 80 WG application technique can be used for treating unwanted woody plants in non-cropland areas adjacent to sensitive crops (see Precautions and Restrictions section). Use of a colored marker or dye in spray mixtures will aid in inspection of the completed work.
Aerial application of Alligare Tebuthiuron 80 WG on rights-of-way is limited to helicopter only. Helicopter or fixed-wing aircraft may be used for establishment of herbicidal firebreaks on rangeland or areas adjacent to rights-of-way.
Apply in 5 or more gallons per acre when using aerial application equipment. Because Alligare Tebuthiuron 80 WG is a soil active herbicide, maximum soil deposition is desirable. This may be achieved by application of extremely large droplets. Large straight stream nozzles, minimum nozzle pressure and spray thickening agents may be used to achieve the maximum possible droplet size and minimize the potential for drift. Foliar deposition from large droplets is also more likely to be washed from foliage to the soil surface during initial rainfall events.
Woody Plant Size and Density
The height and density of woody vegetation is a reliable indicator of soil conditions. Woody vegetation is generally taller and denser where soils are deep and/or of medium to fine texture and where soil moisture conditions are more favorable. Higher rates in the rate range are required on such sites. Woody vegetation will be smaller and less dense on sites with coarse, shallow, or rocky soils with less favorable soil moisture conditions. Lower rates in the range may be used on such sites. Where a high level of woody plant control is required and application rates cannot be adjusted for changes in soils, plant size, or density, apply Alligare Tebuthiuron 80 WG at a rate sufficient to control the tallest and most dense woody vegetation in the treatment area.
Alligare Tebuthiuron 80 WG may be applied anytime except when the soil is frozen or is saturated with moisture. For optimum results, applications should be made prior to the resumption of active seasonal growth in the spring or before expected seasonal rainfall. In areas receiving greater than 25 inches of annual rainfall, late summer and fall applications may require a higher application rate in the indicated rate range to achieve consistent control.
Banded application of Alligare Tebuthiuron 80 WG is recommended for control of brush regrowth after dozing or shredding, provided the regrowth has reached an average height of five feet or more prior to application. Alligare Tebuthiuron 80 WG works best when there is an abundance of active leaf area to stimulate soil moisture and herbicide uptake during the season following application. Taller regrowth will tend to respond with faster and more consistence brush control.
Alligare Tebuthiuron 80 WG may cause temporary herbicidal symptoms to appear on perennial grasses. Dormant season application is recommended to minimize herbicidal effects on desirable forage grasses.
Effect of Shallow Groundwater on Woody Plant Control
Do not apply Alligare Tebuthiuron 80 WG to areas where the water table is predominantly shallow (5 feet or less), such as marshy or sub-irrigated areas, or areas immediately adjacent to streams or lakes which are periodically flooded. On such sites, where roots extend directly to a shallow water table, woody plants are minimally affected by applications of tebuthiuron and poor control will result.
Note: Refer to the Use Restrictions for Ground Water Protection in the Environmental Hazards section for other rate limitations on “vulnerable” sites.
ESTABLISHMENT OF HERBICIDAL FIREBREAKS
Alligare Tebuthiuron 80 WG may be used for establishment of firebreaks in annual grasslands adjacent to frequently traveled areas or areas with a history of repeated wildfires. Application of Alligare Tebuthiuron 80 WG provides residual preemergence control of annual grasses and broadleaf weeds and prevents annual buildup of combustible fuel. Treated strips 40 to 50 feet wide may be established parallel to highways or frequently traveled areas or in a broad-scale grid pattern. Strategic placement of firebreaks can prevent fires from spreading from frequently traveled areas or lightning fires can be confined to the area within a single grid block.
Herbicidal firebreaks can also serve as a means of safe passage in case of entrapment during fire-fighting efforts.
This practice is intended for use in rangelands dominated by annual grasses such as Bromus and other annual grass species and certain broadleaf weeds prevalent in the Great Basin and Pacific Northwest. When surface applied from mid-summer to early fall, Alligare Tebuthiuron 80 WG provides residual preemergence control of susceptible annual grasses and broadleaf weeds from early fall through the spring growth period. Depending on application rate, a single application may provide effective annual grass and broadleaf control for 2 years or more. Desirable perennial grasses within treated strips may be temporarily injured, but if not overgrazed, will increase in vigor and density with time.
Application Timing: Alligare Tebuthiuron 80 WG may be applied from mid-summer through early fall (July 15 through October 15). Application should occur prior to or immediately after the onset of germination of target annual weeds. Alligare Tebuthiuron 80 WG may be applied 2 to 3 months before germination of target weeds without loss of herbicidal activity. The treatment becomes herbicidally active when there is sufficient rainfall to move the herbicide into the surface soil where germination occurs. Control will be reduced if Alligare Tebuthiuron 80 WG is applied after the root systems of target weeds are established and can obtain soil moisture from below the zone of herbicidally active surface soil.
Broadcast Application Rates: Apply Alligare Tebuthiuron 80 WG at a rate of 0.38 to 0.75 lb/acre (0.3 to 0.6 lb a.i./acre) in a minimum spray volume of 5 gallons per acre for ground equipment. Use low pressure large droplet herbicide nozzles. Use the lower end of the rate range in areas with coarse to medium textured soils with low organic matter and the higher end of the rate range in areas with medium to fine textured soils, areas with higher organic matter, or where a longer period of control ids desired.