General Information


Do not apply this product through any type of irrigation system.

When Gramoxone Max is applied at less than 10 gallons per acre finished spray volume, a drift control or spray deposition additive SHOULD be used. Refer to the additive label for use directions.


Gramoxone Max is a contact herbicide used to control or suppress a broad spectrum of emerged weeds. Gramoxone Max controls most small annual weeds – both broadleaves and grasses, and suppresses perennial weeds by destroying green foliage. Gramoxone Max can also be used as a desiccant/defoliant at harvest.

Gramoxone Max is formulated as a liquid which contains 3 lbs. of active ingredient per gallon. The formulation contains a nontoxic odor and an emetic (an agent which will induce vomiting if the product is swallowed). The odor is included in the formulation to help prevent accidental ingestion of Gramoxone Max.

Gramoxone Max is rapidly absorbed by green plant tissue and interacts with the photosynthetic process to produce superoxides which destroy the plant cells. Gramoxone Max requires actively growing green plant tissue to function. Thorough coverage of all green foliage is essential for effective weed control and for effective crop desiccation/defoliation. Gramoxone Max is not as effective on drought-stressed weeds, weeds with little green foliage (i.e., mowed or cut weeds), or mature woody bark of trees and vines.

Clay and organic matter rapidly tie up Gramoxone Max. As a result, Gramoxone Max has no residual soil activity to affect later-planted crops or later germinating weeds.


Because Gramoxone Max is rapidly absorbed by the weed foliage, rain occurring 30 minutes or more after application will have no effect on the activity of Gramoxone Max.


Since Gramoxone Max is a contact-type herbicide, it is essential to obtain complete coverage of target weeds to get good control. Improper application technique and/or application to large, stressed, or mown weeds will usually result in unacceptable weed control and unacceptable crop desiccation/ defoliation. Complete coverage is also essential for good crop desiccation/defoliation. See details below for specific application instructions.


Always add one of the following (Failure to use one of the following at recommended rates will result in reduced performance of Gramoxone Max.)

Nonionic Surfactant: Add nonionic surfactant containing 75% or more surface-active agent at 0.125% v/v (1 pt./100 gals.), OR add a nonionic surfactant containing 50-74% surface-active agent at 0.25% v/v (2 pts./100 gals.), of the finished spray volume for ground applications. For aerial applications, add a nonionic surfactant at 0.25% v/v (2 pts./100 gals.) of the finished spray volume.

Crop Oil Concentrate: Add a nonphytotoxic crop oil concentrate containing 15-20% approved emulsifier, at 1.0% v/v (1 gal./100 gals.) of the finished spray volume for ground applications. For aerial applications, add 1 pt. of crop oil concentrate per acre. Do not use crop oil concentrate when using Gramoxone Max for cotton harvest aid.



Flush all spray equipment with water after use each day. Gramoxone Max is corrosive to aluminum. Aluminum spray equipment and aluminum aircraft structures that are exposed to spray solution or spray drift should be flushed thoroughly with water immediately after use.

In dry areas, dust stirred up by high winds or equipment tires can coat weed or plant leaves and reduce Gramoxone Max activity. Avoid applying Gramoxone Max in extremely dusty conditions.


- For Cotton Harvest Aid: Do not pasture livestock in treated fields or feed treated foliage.

- DO NOT use around home gardens, schools, recreational parks, or playgrounds.

- In preplant and preemergence (to the crop) uses, do not apply to soils lacking clay minerals, i.e., peat, muck, pure sand, artificial planting media.

- Seedbeds and plantbeds should be formed as far ahead of planting and treatment as possible to permit maximum weed and grass emergence prior to treatment.

- Seeding or transplanting should be done with a minimum amount of soil disturbance.

- Gramoxone Max used for preplant weed control over the top of plastic mulch may damage transplants which come in contact with the plastic. Sufficient rainfall or sprinkler irrigation to cause wash-off prior to planting may be needed to prevent damage to the crop.

- Weeds and grasses emerging after application of Gramoxone Max will not be controlled or suppressed.

- Unless otherwise indicated, crop plants emerged at time of application may be severely injured or killed if contacted by sprays of Gramoxone Max.

Limitations, Restrictions, and Exceptions

CHEMICAL FALLOW: Wheat-Fallow-Wheat Rotations (Spring applied; seeded 3-5 months later)

Gramoxone Max Rate Per Acre:

Weeds 1-3”: 1.3-1.7 pts.

Weeds 3-6”: 1.7-2 pts.

Weeds 6”: 2-2.7 pts.

Minimum Total Spray Per Acre: Ground - 5 gals.; Air - 5 gals.

Precautions, Restrictions and Comments

-Application should be made March 1 to April 15, prior to spring rains to conserve moisture.

Volunteer wheat is easier to control after the boot stage, but soil moisture loss will be greater.

- Use at least 1.3 pts. of Gramoxone Max per acre with a PSI (see Photosynthetic Inhibitor Herbicides section) for volunteer wheat or downy brome control in the spring.

- Tank mix with metribuzin, (Sencor 75DF/Lexone) for burndown and residual control of grass and broadleaf weeds.

- Refer to the metribuzin, (Sencor 75DF/Lexone) label for use rates for your soil type, use directions, cautions, and weeds controlled.

Chemical Fallow General Information

-Use higher spray volumes for better coverage as density of stubble, crop residue or weeds increase.

- To control volunteer wheat or downy brome, fall-applied treatments generally work best with Gramoxone Max. If possible, tank mix with Atrazine for maximum burndown and residual control.

- Apply from immediately after harvest up to emergence of the newly seeded crop as a broadcast or band treatment.

- Cut wheat as high as possible to avoid cutting weeds too short, and allow the weeds to grow at least 2-3” after harvest before applying Gramoxone Max.

- The addition of dicamba, (Banvel) or 2,4-D ester (Low Volatile) may aid in the suppression of emerged perennial broadleaf weeds and large annual broadleaf weeds.

- Refer to 2,4-D ester (Low Volatile), Banvel, or residual herbicide label(s) for directions, limitations, cautions and for a listing of weeds controlled.

- For extended weed control during the fallow period, tank mixes with registered residual herbicide combinations other than those listed on the label are permissible.

- Weeds taller than 6” may not be controlled.

- Weeds and grasses emerging after application will not be controlled.

- Crop plants emerged at the time of application will be killed.

- By ground application, apply 5-60 gallons of spray mix per acre. If applying at <10 GPA by ground, utilize the following additional precautions:

- Do not apply with floaters or exceed a speed of 10 mph.

- Apply with flat fan nozzles only at 30-40 psi.

- Apply only in a tank mix with atrazine at a minimum of 0.5 lb. a.i./acre.

- By air, apply in 5-10 gals. of spray mix per acre.

Restricted Entry Interval

12 hours