General Information

General Information

Prowl 3.3 EC herbicide is a selective herbicide for controlling most annual grasses and certain broadleaf weeds as they germinate. Prowl 3.3 EC will not control established weeds.

Unusually cold, excessively wet, or hot and dry conditions that delay germination or extend germination over a long period of time can reduce weed control.

Overapplication can result in crop-stand loss, crop injury, or soil residues.

Uneven application or improper soil incorporation can decrease weed control or cause crop injury. Soil incorporation deeper than recommended can reduce weed control.

Seedling diseases, cold weather, excessive moisture, shallow or deep planting, low or high soil pH, high soil salt concentration, or drought can weaken seedlings and plants and increase the possibility of crop damage from Prowl 3.3 EC. Under these conditions, crop yields can be reduced.

Mode of Action

Prowl 3.3 EC herbicide is a meristematic inhibitor that interferes with the plant's cellular division or mitosis. This and/or other products with the meristematic inhibiting mode of action may not effectively control naturally occurring biotypes of some of the weeds listed on the label. A weed biotype is a naturally occurring plant within a given species that has a slightly different, but distinct, genetic makeup from other plants. Other herbicides with the meristematic inhibiting mode of action include other dinitroaniline herbicides, such as trifluralin. If naturally occurring meristematic inhibiting resistant biotypes are present in a field, Prowl 3.3 EC and/or any other meristematic inhibiting mode of action herbicide should be tank mixed or applied sequentially with an appropriate registered herbicide having a different mode of action to ensure control.

Application Rate

Use rates for Prowl 3.3 EC when used alone, in tank mix, or sequential applications are given in Crop-Specific Information. Use rates of this product vary by soil texture and organic matter. See Table 2 for the soil texture groupings used in the label.


Prowl 3.3 EC will provide most effective weed control when applied by ground or aerial equipment and subsequently incorporated into soil within 7 days after application by rainfall, sprinkler irrigation, or mechanical tillage prior to weed seedling emergence from soil. Prowl 3.3 EC can also be applied through chemigation, including flooded basin irrigation systems. Prowl 3.3 EC is recommended for preplant surface, preplant incorporated, surface incorporated, preemergence, early postemergence, postemergence incorporated (CULTI-SPRAY) or layby treatment. See Crop-Specific Information for specific application directions by crop.

PREPLANT SURFACE APPLICATIONS: For use in minimum tillage or no-tillage production systems, apply Prowl 3.3 EC alone or in tank mixes up to 45 days before planting. When making early preplant surface applications (15 to 45 days prior to planting), Prowl 3.3 EC should be tank mixed or followed by a postemergence herbicide application. Rainfall or sprinkler irrigation within 7 days after application is required to move this product into the upper soil surface where weed seeds germinate.

PREPLANT INCORPORATED APPLICATIONS: Apply Prowl 3.3 EC and incorporate into the upper (1\" to 2\" ) soil surface up to 60 days before planting. Use an implement capable of giving uniform incorporation; two-pass incorporation usually results in a more consistent result.

SURFACE INCORPORATED APPLICATIONS: Uniformly apply Prowl 3.3 EC as broadcast or banded treatment to soil surface underneath established trees and/or in ground areas between trees rows. Within 7 days after application, incorporate into upper (1\" to 2\") soil surface using either rainfall, sprinkler irrigation, or shallow mechanical incorporation using an implement capable of giving uniform incorporation; two-pass mechanical incorporation usually results in a more consistent result.

PREEMERGENCE SURFACE APPLICATIONS: Broadcast treatment uniformly to the soil surface at planting and up to 2 days after planting. Rainfall, sprinkler irrigation, or shallow mechanical incorporation within 7 days after application is required to move this product into the upper soil surface where weed seeds germinate. If adequate rainfall or irrigation does not occur and weed seedling emergence begins, a shallow cultivation or rotary hoeing will improve performance.

EARLY POSTEMERGENCE APPLICATIONS: Prowl 3.3 EC must be applied prior to weed seedling emergence or in a tank mix with products that control the emerged weeds. Refer to Crop-Specific Information for specific postemergence application recommendations by crop.

POSTEMERGENCE INCORPORATED APPLICATIONS (CULTI-SPRAY): Prior to application, crop must be cultivated in such a manner as to throw at least one inch of soil over the base of the crop plants. This will prevent direct contact of Prowl 3.3 EC and the zone of brace root formation. Prowl 3.3 EC must be applied broadcast with a ground sprayer when crop is at least 4 inches tall up to layby. Use drop nozzles if crop foliage will prevent uniform coverage of the soil surface within the rows. Thoroughly and uniformly incorporate Prowl 3.3 EC treatments into the soil with:

(1) a sweep-type or rolling cultivator set to provide thorough incorporation in the top 1 inch of soil, or

(2) adequate overhead irrigation water or rainfall. See Crop-Specific Information (Corn and Grain Sorghum) for more details on (CULTI-SPRAY) application.

LAYBY APPLICATION: Apply Prowl 3.3 EC directly to the soil between rows as a directed spray following the last normal cultivation (layby). See Crop-Specific Information for more details on layby application.

SPLIT APPLICATIONS: Prowl 3.3 EC may be applied preplant incorporated up to 60 days prior to planting and followed by a preemergence application at planting or up to 2 days after planting. The total amount of Prowl 3.3 EC herbicide applied per acre per season cannot exceed the highest labeled rate for any given soil type. See Crop-Specific Information for more details on split applications.

FALL APPLICATIONS: Prowl 3.3 EC may be used in fall application programs in certain crops. See Crop-Specific Information for details on fall application timing.

Spraying Instructions

Prowl 3.3 EC may be applied using either water or sprayable fluid fertilizer (such as straight 32-0-0 or 28-0-0) as the spray carrier. Additionally, Prowl 3.3 EC may be impregnated on dry bulk fertilizer. Sprayable fluid fertilizer as a carrier is NOT recommended for use after crop emergence unless the typical fertilizer burn symptoms on the crop are acceptable.

Aerial Applications

Uniformly apply in 5 or more gallons of water per acre. Exercise caution to minimize drift. DO NOT apply during periods of gusty winds or when wind conditions favor drifting. Spray drift can cause injury to sensitive crops. It is recommended that a flagman or an automatic mechanical flagging unit on the aircraft be used to avoid overlapping and possible crop injury.

Ground Applications (Broadcast)

Uniformly apply with properly calibrated ground equipment in 10 or more gallons of water per acre or 20 or more gallons of liquid fertilizer per acre. Use sprayers equipped with appropriate nozzles that provide uniform and accurate spray distribution and minimize drift. Keep the bypass line on or near the bottom of the tank to minimize foaming. Nozzle and in-line screens must be no finer than 50 mesh. Application of Prowl 3.3 EC during periods of gusty winds may result in uneven applications. DO NOT apply Prowl 3.3 EC postemergence in liquid fertilizers.

If liquid fertilizer/herbicide(s) mixture separates in the spray tank, clogged equipment and uneven application can result. Always predetermine the compatibility of Prowl 3.3 EC alone or with other herbicides based on the compatibility “jar test”, please refer to the section of the label.

Ground Applications (Band)

Uniformly apply the broadcast equivalent rate and volume per acre. To determine these, refer to the section of the label.

Ground Applications (Dry Bulk Fertilizer)

Apply Prowl 3.3 EC/dry bulk fertilizer mixtures only with ground equipment. DO NOT impregnate Prowl 3.3 EC onto coated ammonium nitrate or limestone because these materials will not absorb the herbicide. Dry fertilizer blends containing mixtures of ammonium nitrate or limestone may be impregnated with Prowl 3.3 EC. A minimum of 200 pounds of impregnated dry bulk fertilizer, excluding the weight of ammonium nitrate or limestone, must be applied per acre.

Refer to the label for the formula to determine the amount (in pints) of Prowl 3.3 EC to be impregnated on a ton of dry bulk fertilizer based on the rate of fertilizer to be applied per acre.

To impregnate Prowl 3.3 EC on bulk fertilizer, use a closed rotary-drum mixer or other commonly used dry bulk fertilizer blender equipped with suitable spray equipment. Spray nozzles must be placed to provide uniform coverage of Prowl 3.3 EC onto the fertilizer during mixing.

Apply the Prowl 3.3 EC/dry bulk fertilizer mixture with an accurately calibrated dry fertilizer spreader. The Prowl 3.3 EC/dry bulk fertilizer mixture must be spread uniformly on the soil surface.

Restrictions and Limitations

DO NOT exceed the maximum labeled rate for any soil type.

Prowl 3.3 EC herbicide will not control established weeds. Destroy emerged weeds prior to application.

Prowl 3.3 EC is most effective in controlling weeds mechanically incorporated or when incorporated into the weed germination zone by adequate rainfall or overhead irrigation after application.

When using tank mixtures with Prowl 3.3 EC, always read the companion product label(s) to determine the specific use rates by soil types, weed species, and weed or crop growth stage. In addition, follow all precautions and restrictions including state and local use restrictions that may apply to specific products. Always follow the most restrictive label.

In the event of a crop loss due to adverse weather conditions or other reasons, any crop registered for a preplant incorporated application of Prowl 3.3 EC can be replanted without adverse effects the same year (see Crop-Specific Information for exceptions). If replanting is necessary, DO NOT work the soil deeper than the treated zone.

Refer to Crop-Specific Information for crop-specific preharvest intervals and feeding and grazing restrictions.

Limitations, Restrictions, and Exceptions


Prowl 3.3 EC may be applied as a delayed preemergence application in drilled dry-seeded rice or as an early postemergence application in dry-seeded rice. Treatments may be applied to conventional, reduced or minimum tillage, and no-till (stale seedbed) rice. The seedbed should be firm and free of clods and must be prepared to allow for good seed coverage. The use of a planter under conditions that do not allow good soil coverage of the rice seed can result in reduced stand or stunting if Prowl 3.3 EC contacts germinating rice seed.

Additional Weeds Controlled: In addition to the weeds listed in Table 1, Prowl 3.3 EC will control the following weeds in rice: junglerice and sprangletop.

Use Methods and Timings

Delayed Preemergence - Apply Prowl 3.3 EC alone or with tank mix partner for delayed preemergence weed control in grain-drilled, dry-seeded rice. Apply Prowl 3.3 EC alone or in tank mixture to levees after the levees are pulled and planted. Exposed seeds that come in contact with Prowl 3.3 EC may be injured. Apply only when growing conditions favor vigorous rice growth. The seedbed should have adequate moisture for seed germination. Not for use in California.

Uniformly apply the recommended rate of Prowl 3.3 EC after rice planting and before rice and weed emergence (spiking). Apply after the rice seed has absorbed water and germinated and after the soil has been previously sealed over the seed by at least 1 inch of rainfall or by irrigation (flush). If the soil has not been sealed by rain or flush, apply when 80 percent of germinated seeds have a primary root (radicle) or shoot at least ½-inch long. If there is insufficient moisture, flushing is recommended before Prowl 3.3 EC application to supply moisture for root (radicle) initiation and for vigorous rice and weed growth.

If applied to soil prior to these conditions or to cracked soil, stand reduction or stunting of rice may occur. Under some conditions, use of gibberellic acid-treated seed, heavy rainfall after application, or flushing after application may result in herbicide injury to rice. Rice can overcome moderate injury with appropriate cultural practices.

Due to the residual activity of Prowl 3.3 EC herbicide, this treatment may be applied if rice is too small to maintain a flood on the field for weed control. However, proper water management practices must be followed for normal rice growth and activity of Prowl 3.3 EC.

Restrictions and Limitations

- DO NOT apply Prowl 3.3 EC through any type of irrigation system.

- DO NOT apply in liquid fertilizer.

- DO NOT use on water-seeded rice except as specified in other BASF labeling.

- DO NOT apply to rice fields if fields are used for fish production, especially catfish or crayfish farming.

- DO NOT bale or use rice straw from treated fields for feed or bedding.

- DO NOT use water containing Prowl 3.3 EC residues from rice cultivation to irrigate food or feed crops that are not registered for use with Prowl 3.3 EC.

- In case of a crop failure due to weather conditions or disease following treatment with Prowl 3.3 EC alone or in a tank mixture, only drilled dry-seeded rice may be immediately replanted; however, the grower assumes all risks and consequences associated with replanting of rice because there is the potential for stand reduction or stunting. A 10 percent increase in seeding rate is recommended. Replant seed below the herbicide layer because reduced stand or stunting may occur if Prowl 3.3 EC contacts germinating rice seed.

DO NOT replant with gibberellic acid-treated seed.

DO NOT reapply Prowl 3.3 EC alone or in a tank mixture.

- DO NOT apply Prowl 3.3 EC and then flush for germination.

- DO NOT apply to stressed rice. Stress factors include cold or hot temperature extremes, excessive moisture or drought, problem soils, poor field drainage, or deep water after application.

- DO NOT apply early preemergence nor preplant incorporated as severe rice injury is possible.

- DO NOT feed forage or graze livestock in treated fields.

Canarygrass; Cheat; Downy brome (Cheatgrass); Hairy chess; Itchgrass; Italian ryegrass; Japanese brome; Jointed goatgrass; Oat, wild; Shattercane; Signalgrass; Wild proso millet; Woolly cupgrass; Chickweed, common; London rocket; Shepherdspurse; Smartweed, Pennsylvania; Velvetleaf: Suppression, but controlled when Prowl 3.3 EC use rate exceeds 4.8 pts/A.

Hairy chess; Japanese brome; Jointed goatgrass; Bugloss, small: Neither suppressed nor controlled in California.

Canarygrass; Cheat; Mustard, black: Not controlled in California.

Restricted Entry Interval

24 hours

Exception: if the product is soil injected or 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.