General Information


DuPont VELPAR ALFAMAX herbicide is a waterdispersible granule that is mixed in water and applied as a spray for weed control in alfalfa.

VELPAR ALFAMAX is an effective general herbicide providing both contact and residual control of many annual and biennial weeds.

VELPAR ALFAMAX is noncorrosive to equipment.

Care should be exercised when applying VELPAR ALFAMAX near desirable trees or shrubs as they can absorb VELPAR ALFAMAX through roots extending into treated areas.


VELPAR ALFAMAX may be applied by ground equipment and, where permitted, aerial equipment. Use rates, minimum spray gallonage, and other application information are described for various uses.


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.


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.


- Do not replant treated areas to any crop except corn, root crops or sugarcane within two years after treatment, as crop injury may result.

- Corn may be planted 12 months after the last treatment in areas of moderate to high rainfall (greater than 20 inches), as long as the use rate does not exceed 2.1 pounds of product per acre.

- Root crops such as potatoes, sugarbeets, radish and carrots may be planted 12 months after last treatment, provided the use rate is less than or equal to 1.5 pounds of product per acre. Sites with use rates greater than 1.5 pounds of product per acre should not be replanted to any crop (except corn as noted above) within 2 years of application, or unacceptable crop injury may result.

- In areas where irrigation is needed to produce the crop, or in irrigated alfalfa seed production fields, the crop rotation intervals listed may need to be extended if the normal irrigation amount is reduced for any reason, such as induced drought stress to stimulate seed set.

- Sugarcane may be planted any time following treatment.

- In California, do not replant seed alfalfa areas to any crop within two years after treatment, as crop injury may result.

Limitations, Restrictions, and Exceptions


DuPont VELPAR ALFAMAX is registered for control of certain weeds in established alfalfa grown for hay. Make only a single application to alfalfa grown for seed or hay.

- Do not apply within 30 days of harvest (cutting for hay), or feeding of forage or grazing.

- Do not exceed 4.3 pounds (1.5 pounds active ingredient hexazinone) per acre per year.



In the following states, make a single application during winter months when alfalfa plants are in the least active stage of growth: Arizona, California, Colorado, Idaho, Kansas, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington and Wyoming.

NOTE: Severe alfalfa injury may result following application, if after cutting the regrowth is more than 2 inches high, or there is significant stubble left after cutting or grazing, or the air temperature is above 90 °F.

In the following states, make a single application in the spring before new growth begins: Connecticut, Delaware, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia and Wisconsin.


Make a single application after alfalfa becomes dormant and before new growth begins in the spring. Where weeds have emerged, use a surfactant.


DuPont VELPAR ALFAMAX, when applied preemergence or early postemergence at the listed rates will control or suppress the listed species.



VELPAR ALFAMAX is registered for the control or suppression of many annual broadleaf weeds and grasses in established alfalfa grown for seed.



- Do not stress the alfalfa as crop injury may occur. Conditions that might cause injury could include drought stress, or induced drought stress to stimulate seed set, followed by irrigation resulting in a rapid uptake of product into the plant.

- Do not apply more than 1.5 pounds of product per acre on fields with sandy loam or loamy sand soils having 1–2% organic matter.

- Do not apply more than 1.5 pounds of product per acre on seed alfalfa that has been established for only one growing season.

- If abnormally dry conditions exist following application, restrict the first irrigation to no more than 1/2 inch of water.

- Injury or reduced seed production may occur when applications of VELPAR ALFAMAX are made to alfalfa planted in fields having a shallow hardpan layer.

- Do not use VELPAR ALFAMAX on gravelly or rocky soils, exposed sub-soils, hardpan, sand, poorly drained soil, or alkali soils.

- Crop injury, including mortality, or reduced flowering or seed set, may result in fields with restricted root growth due to non-uniform soil profiles such as gravel bases and clay lenses.

- Do not use VELPAR ALFAMAX on fields with sandy loam or loamy sand soils having less than 1% organic matter.

Pre-Harvest Interval

30 days

Restricted Entry Interval

48 hours