General Information


GLEAN XP is a dry-flowable granule and when applied according to the instructions on this label, will control many broadleaf weeds. GLEAN XP can be used on the crops wheat, barley, oat, and triticale.
GLEAN XP is noncorrosive, nonflammable, nonvolatile, and does not freeze.
GLEAN XP controls weeds by both preemergence and postemergence activity.

Environmental Conditions and Biological Activity

GLEAN XP is absorbed through the roots and foliage of broadleaf weeds, rapidly inhibiting their growth. One to three weeks after application to weeds, leaves of susceptible plants appear chlorotic, and the growing point subsequently dies.

Postemergent application of GLEAN XP provides the best control in vigorously growing crops that shade competitive weeds. Weed control in areas of thin crop stand or seeding skips may not be as satisfactory. However, a crop canopy that is too dense at application can intercept spray and reduce weed control.

GLEAN XP may injure crops that are stressed from adverse environmental conditions (such as extreme temperatures or moisture), abnormal soil conditions, insect pressure, or cultural practices. In addition, different varieties of the crop may be sensitive to treatment with DuPont GLEAN XP under otherwise normal conditions. Treatment of such varieties may result in crop injury.

In warm, moist conditions, the expression of herbicide symptoms is accelerated in weeds; in cold, dry conditions, expression of herbicide symptoms is delayed. In addition, weeds hardened-off by drought stress are less susceptible to GLEAN XP.

Rainfall is needed to move GLEAN XP into the soil for preemergence weed control, but postemergence weed control may be reduced if rainfall occurs soon after application.


Do not apply this product through any type of irrigation system.
- Do not store pesticides near well sites.
- Do not discharge excess material on the soil at a single spot in the field or mixing/loading station.
- Injury to or loss of desirable trees or vegetation may result from failure to observe the following:
- Do not apply, drain or flush equipment on or near desirable trees or other plants or on areas where their roots may extend, or in locations where the chemical may be washed or moved into contact with their roots.
- Do not use on lawns, walks, driveways, tennis courts, or similar areas. Prevent drift of spray to desirable plants.
Injury to or loss of adjacent sensitive crops and vegetation may result from failure to observe the following:
- Only make one application of GLEAN XP per crop season
- Do not make more than one application of this product per growing season.
- Take all necessary precautions to avoid all direct or indirect contact (such as spray drift) with non-target plants or areas.
- Carefully observe sprayer cleanup instructions, both prior to and after using this product, as spray tank residue may damage crops other than wheat, barley, or oat.
Do not apply GLEAN XP to crops that are stressed by severe weather conditions, drought, low fertility, water-saturated soil, disease or insect damage, as crop injury may result. Severe winter stress, drought, disease, or insect damage following application may also result in crop injury.
Do not apply to crops mixed with legumes, as injury to the legumes will result.
Do not apply to frozen ground where surface runoff may result.
Do not apply to snow-covered ground.
Do not apply to irrigated land where tailwater will be used to irrigate other cropland.
Only make one application of the active ingredient chlorsulfuron per crop season.
In far-western Kansas (last tier of counties along the Colorado/Kansas border), Western Nebraska, Eastern New Mexico, and the Oklahoma and Texas panhandles, take the following precautions:
- Do not use a tank mix containing DuPont ALLY herbicide within 22 months of GLEAN XP application.
- Do not use GLEAN XP in continuous cereals or cereal/fallow/cereal rotations.
- GLEAN XP in a tank mix at 0.17 to 0.33 oz per acre may be used only as a fallow treatment in corn or sorghum stubble in wheat/sorghum/fallow, or wheat/corn/fallow rotations where other residual broadleaf herbicides having different modes of action are used.
In California, Northern Idaho, Oregon, and Washington, take the following precautions:
- Do not make an early season treatment where a tank mix cannot be made.
- Do not apply GLEAN XP during fallow.

Wheat, Barley, Oat and Triticale

Do not apply GLEAN XP preemergence to barley or triticale.
Do not apply GLEAN XP preemergence if cold or dry weather conditions exist. Wait until the weather improves and the crop is growing vigorously before making the application (See Postemergence).
In areas with severe winter weather, do not apply postemergence GLEAN XP during late fall, winter, or early spring unless crop is well established and has started to tiller or crop injury may result.
Do not use GLEAN XP postemergence within 60 days of crop emergence where organophosphate insecticides have been used as an in-furrow treatment or crop injury may result.
Do not use GLEAN XP as a preemergence application where organophosphate insecticides have been used as an in-furrow treatment or crop injury may result.
Wherever DuPont GLEAN XP is used on land previously treated with DuPont FINESSE, DuPont ALLY, “Amber”, “Assert”, or other longer residual herbicides with the same mode of action, read the rotational guidelines on both labels and follow the one with the longest interval stated for your situation before choosing to rotate to crops other than wheat or barley.
Preemergence applications of 2,4-D or herbicides containing 2,4-D made within two weeks of planting spring cereals may cause crop injury when used in conjunction with preemergence or early postemergence applications of GLEAN XP.
The combined effects of the preemergence use of GLEAN XP plus preemergence wild oat herbicides may cause crop injury to spring wheat when crop stress (soil crusting, planting too deep, prolonged cold, wet weather, or drought) causes poor seedling vigor.
Do not apply GLEAN XP during boot or early heading as crop injury may result.
Do not harvest grain sooner than 45 days after the application of GLEAN XP.
In the Pacific Northwest, to prevent crop injury due to cold weather, avoid making preemergence applications or early postemergence applications (2-4 leaf stage) to wheat or barley during late fall or winter when cold weather conditions are unpredictable and can be severe. The combined effects of herbicide stress plus cold weather stress can result in greater crop injury than stress factor alone.


Mix only enough product for the job at hand and avoid overfilling of spray tank.
Calibrate sprayers only with clean water away from the well site.
Make scheduled checks of spray equipment.
Ensure that all operation employees accurately measure pesticides.
When triple-rinsing the pesticide container, be sure to add the rinsate to the spray mix.
Dilute and agitate excess solution and apply at labeled rates or uses.
Preemergence weed control or suppression may be unsatisfactory on soils containing 5% or more organic matter.
Fall applications on coarse textured soils (especially those having a pH of greater than 7.0) may not provide adequate control or suppression of spring germinating weeds.
To reduce the potential for movement of treated soil due to wind erosion, do not apply to powdery dry or light sandy soils until they have been stabilized by rainfall, trashy mulch, reduced tillage or other cultural practices. Injury to immediately adjacent crops may result when treated soil is blown onto land used to produce crops other than cereal grains.
For ground applications applied postemergence to weeds when dry, dusty field conditions exist, control of weeds in wheel track areas may be reduced. The addition of 2,4-D or MCPA should improve weed control under these conditions.
Crop varieties may differ in their response to various herbicides. DuPont recommends that you first consult your state experiment station, university, or extension agent as to crop sensitivity to any herbicide. If no information is available, limit the initial use of GLEAN XP to a small area.

Wheat, Barley, Oat and Triticale

GLEAN XP may injure crops that are stressed from adverse environmental conditions (such as extreme temperatures or moisture), abnormal soil conditions, insect pressure, or cultural practices. In addition, different varieties of the crop may be sensitive to treatment with GLEAN XP under otherwise normal conditions. Treatment of such varieties may result in crop injury.


DuPont GLEAN XP, which contains the active ingredient chorsulfuron is a Group 2 herbicide based on the mode of action classification system of the Weed Science Society of America.
When herbicides that affect the same biological site of action are used repeatedly over several years to control the same weed species in the same field, naturally-occurring resistant biotypes may survive a correctly applied herbicide treatment, propagate, and become dominant in that field. Adequate control of these resistant weed biotypes cannot be expected. If weed control is unsatisfactory, it may be necessary to retreat the problem area using a product affecting a different site of action.
To better manage herbicide resistance through delaying the proliferation and possible dominance of herbicide resistant weed biotypes, it may be necessary to change cultural practices within and between crop seasons such as using a combination of tillage, retreatment, tank-mix partners and/or sequential herbicide applications that have a different site of action. Weed escapes that are allowed to go to seed will promote the spread of resistant biotypes.
It is advisable to keep accurate records of pesticides applied to individual fields to help obtain information on the spread and dispersal of resistant biotypes. Consult your agricultural dealer, consultant, applicator, and/or appropriate state agricultural extension service representative for specific alternative cultural practices or herbicide recommendations available in your area.
Naturally occurring weed biotypes that are resistant to “Amber” herbicide, DuPont ALLY herbicide, DuPont FINESSE herbicide, DuPont EXPRESS herbicide or DuPont HARMONY Extra herbicide will also be resistant to GLEAN XP.


This product may be used as part of an Integrated Pest Management (IPM) program that can include biological, cultural, and genetic practices aimed at preventing economic pest damage. IPM principles and practices include field scouting or other detection methods, correct target pest identification, population monitoring, and treating when target pest populations reach locally determined action thresholds. Consult your state cooperative extension service, professional consultants or other qualified authorities to determine appropriate action treatment threshold levels for treating specific pest/crop systems in your area.


To obtain optimum spray distribution and thorough coverage, use flat-fan or low-volume flood nozzles. When using flat-fan nozzles, use a spray volume of at least 3 gal per acre (GPA). When using flood jet or “Raindrop RA” nozzles, use higher spray volume (minimum 20 GPA) to ensure thorough coverage. However, GLEAN XP may not be applied at less than 10 GPA when using small orifice flooding nozzles such as flood jet TK 5 to TK 7.5 or equivalent. These flooding nozzles must be on a 30-inch spacing or not less than 13 GPA when on a 40-inch spacing. It is essential to overlap the nozzles 100% for all spacings. Use screens that are 50-mesh or larger.


Use nozzle types and arrangements that provide optimum spray distribution and maximum coverage at 1 to 5 GPA. Use at least 3 GPA in Idaho, Oregon, or Utah. When applying GLEAN XP by air in areas where sensitive crops are nearby, use solid stream nozzles oriented straight back.

Limitations, Restrictions, and Exceptions


GLEAN XP is for control of broadleaf weeds in field border areas and fence lines. Apply GLEAN XP at 0.25 to 0.5 oz per acre.

Restricted Entry Interval

4 hours