General Information


DuPont PREQUEL herbicide must be used only in accordance with instructions on the label or in supplemental DuPont publications. DuPont will not be responsible for losses or damage resulting from use of this product in any manner not specifically specified by DuPont.

PREQUEL herbicide is a water dispersible granule containing 45% active ingredients by weight. PREQUEL is a selective herbicide for burndown and residual control of certain annual grass and broadleaf weeds when applied preemergence to field corn. PREQUEL can be tank mixed with a variety of corn herbicides to improve burndown and residual control.

PREQUEL is absorbed through the roots of plants, rapidly inhibiting the growth of susceptible weeds. Rainfall or sprinkler irrigation is needed to move PREQUEL into the soil. Susceptible weeds will generally not emerge from preemergence application. In some cases susceptible weeds may germinate and emerge a few days after application, but growth then ceases and leaves become chlorotic three to five days after emergence. Death of leaf tissue and growing point will follow in some species, while others will remain green but stunted and noncompetitive.

PREQUEL treatments are most effective in controlling weeds when adequate rainfall is received within 14 days after application. If cultivation is necessary because of soil crusting, soil compaction or weed germination before rain occurs, use shallow tillage such as rotary hoeing to lightly incorporate PREQUEL. Make certain corn seeds are below the tilled area.

PREQUEL is best used in a planned sequential application herbicide program such as PREQUEL followed by an in-crop application of DuPont RESOLVE Q or DuPont STEADFAST Q with appropriate tank mix partners. Refer to the label of the respective sequential partner for specific use directions. Consult local DuPont representatives, fact sheets or technical bulletins for additional information.

Plant corn at least 1.5 inches deep. Corn seed must be completely covered with soil with a firmed furrow.

Do not apply to field corn grown for seed, popcorn or sweet corn.

Do not apply preemergence to coarse-textured soils (sand, loamy sand or sandy loam) with less than 1% organic matter.

Do not apply more than 1.66 - 2.5 ounces of PREQUEL in a growing season unless instructed to do so by DuPont Technical Bulletins, Fact sheets or Supplemental Labeling.

Do not apply more than a total of 0.5 oz active ingredient rimsulfuron during the crop year. This includes combinations of preemergence applications of PREQUEL, as well as rimsulfuron from application(s) of products such as DuPont BASIS, RESOLVE Q, or STEADFAST Q.

Apply PREQUEL to field corn hybrids with a relative maturity (RM) of 77 days or more, including “food grade” (yellow dent, hard endosperm), waxy and High-Oil corn. Not all field corn hybrids of less than 77 days RM, and not all white corn hybrids nor Hi-Lysine hybrids have been tested for crop safety, nor does DuPont have access to all seed company data. Consequently, injury arising from the use of PREQUEL on these types of corn is the responsibility of the user. Consult with your seed supplier before applying PREQUEL to any of these corn types. Seed company publications indicate “Warning”, “Crop Response Warning”, or “Sensitive” notations for the use of some ALS herbicides on corn hybrids of 77 CRM or higher. As noted in the seed company publications, DuPont sulfonylurea herbicides such as PREQUEL should be used with caution on these hybrids. Consult with your local DuPont representative or the DuPont Label Web Site ( for any additional supplemental labeling information relative to potential corn hybrid sensitivity to PREQUEL.


Avoid spray overlaps as excessive rates may result in adverse crop response.

Use a minimum of 15 gallons of water per acre (GPA) to ensure thorough coverage of the weeds and the best performance. Use a minimum of 10 GPA for light, scattered stands of weeds.

To minimize spray drift to non-target areas, apply this product using nozzles which deliver a coarse or larger spray droplet as defined by ASAE standard S-572 and as shown in nozzle manufacturer’s catalogues. Keep the spray boom at the lowest possible spray height above the target surface. Refer to nozzle manufacturer’s recommendations for proper nozzle, pressure setting and sprayer speed for optimum product performance and minimal spray drift. Use sprayers that provide accurate and uniform application.

Maintain adequate agitation at all times, including momentary stops.


For band applications, use proportionately less spray mixture. To avoid crop injury, carefully calibrate the band applicator to not exceed the labeled rate. Carefully follow the manufacturer's instructions for nozzle type (flat fans), orientation, and distance of nozzles from the crop and weeds, spray volumes, calibration and spray pressure.



DuPont PREQUEL herbicide may interact with certain insecticides previously applied to the crop. Crop response varies with field corn type, insecticide used, insecticide application method, and soil type.

PREQUEL may be applied to corn previously treated with “Fortress”, “Aztec”, or “Force” insecticides or nonorganophosphate soil insecticides regardless of soil type.

Allow at least 60 days between a pre-emergence or preplant application of PREQUEL and application of an organophosphate insecticide (such as “Counter”) since crop injury may result.

Crop response may increase and crop recovery may be slowed when corn is grown under conditions that inhibit crop growth.

Such conditions include extremely wet, cold, or dry soils, high pH, or low fertility.

PREQUEL herbicide applications to coarse soils with organic matter of less than 1.5% by weight or pH greater than 7.5 may cause adverse crop response.


Do not irrigate PREQUELherbicide into coarse soils at planting time when soils are saturated. Do not apply this product through any type of irrigation system.

Do not apply this product using aerial application equipment.

Do not use flood or furrow irrigation to apply, activate or incorporate this product.

In the States of CO, KS, KY, MO, and TN, if the water table (i.e., level of saturation) is less than 25 feet below the ground surface, do not use on loamy sand or sand surface soil and subsoils with an average organic matter (in the upper 12 inches) of less than 2% by weight.

In the States of IA, IL, IN, MT, ND, NE, OH, PA, SD and WY, if the water table (i.e., level of saturation) is less than 25 feet below the ground surface, do not use on sandy loam, loamy sand or sand surface soils and subsoils with an average organic matter (in the upper 12 inches) of less than 2% by weight.

Use on clay knolls, eroded hill sides, terracing with scraped exposed subsoil, or other areas of coarser and/or lower organic matter soils, may cause adverse crop response. To prevent offsite movement of soil containing this product to non-target areas, do not apply PREQUELherbicide to areas receiving less than 15 inches of average annual precipitation unless supplemented to at least the equivalent of 15 inches of annual precipitation with irrigation water.

Do not graze, feed forage, grain or fodder (stover) from treated areas to livestock within 30 days of PREQUEL application.

Injury or loss of desirable trees or vegetation may result from failure to observe the following:

- Do not apply PREQUEL or drain or flush application 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 or spray to desirable plants.

- Do not contaminate any body of water.

- Thoroughly clean application equipment immediately after use. (See Sprayer Cleanup section of the label for instructions).


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.


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.

Refer in the label regarding tank mix information.

Limitations, Restrictions, and Exceptions



If the water table (i.e. level of saturation) is less than 25 feet below the ground surface, do not apply to the following vulnerable sandy loam, loamy sand or sand soils. If the water table is unknown, do not apply PREQUEL herbicide to a restricted soil. If a field contains several soil types, one of which is a vulnerable soil listed below, and the water table is less than 25 feet, do not apply PREQUEL herbicide.

Ascalon, Bangston, Bankard, Barcus, Baroid, Batterson, Bijou, Blakeland, Boel, Brad, Breece, Bresser, Canlodore, Cascajo, Chappell, Chaseville, Clark Fork, Columbine, Comad, Corlena, Corlett, Costilla, Cotopaxi, Coyet, Crestman, Crustown, Dailey, Dix, Dunday, Dune, Land, Dunul, Dwyer, Eachuston, Ecklund, Eghelm, Ellicott, Els, Elsmere, Farb, Farisita, Fruita, Fruitland, Gilcrest, Glenberg, Glendive, Gracot, Gretdivid, Grieves, Grimm, Grimstone, Gunbarrel, Hiwan, Inavale, Ipage, Ironsprings, Juget, Julesburg, Kandaly, Kerber, Kettle, Kippen, Laird, Laney, Las Animas, Layoint, Legault, Lincoln, Littlebear, Lonetree, Luning, Mathis, Maybell, Medano, Mespun, Mido, Mirror Lake, Moenkopie, Moosed, Mosca, Munjor, Mysten, Nakai, Nesda, Neville, Newcomb, Olney, Orsa, Osgood, Otero, Ouray, Pando, Patna, Peetz, Pineguest, Platte, Redcreek, Resort, Riverwash, Rosebud, Roswell, Ruedloff, Ruhe, Ryark, San Isabel, Sandy, Aluvial Land, Sawcreek, Schooner, Sheppard, Siebert, Southace, Space City, Sphinx, Spool, Stapleton, Stecum, Sundance, Tassel, Thoroughfare, Tipper, Tipperary, Tivoli, Tomah, Tomichi, Trail, Tricera, Tullock, Ustic, Torriorthents, Valent, Valentine, Vona, Wigton, Willwood, Yetull, Zeona


- Only corn may be planted back within 6 months of a PREQUEL herbicide application.

- Dry beans, sugarbeets and melons can not be planted back within 18 months of a PREQUEL herbicide application.

- For dryland agriculture, only corn can be planted back within 16 months of a PREQUEL herbicide application.

- Do not rotate to other crops within 6 months after application of PREQUEL herbicide.

Restricted Entry Interval

12 hours