General Information


Extreme herbicide provides burndown and residual control of many broadleaf and grass weeds in soybeans, Clearfield corn, and Roundup Ready alfalfa. Extreme may be applied postemergence to Roundup Ready soybeans and Roundup Ready alfalfa for season-long weed control. Extreme is effective for difficult-to-control weeds common to no-till production, including marestail.

Occasionally, internode shortening and/or temporary yellowing of crop plants may occur following an Extreme application. These effects occur infrequently and are usually temporary.

Extreme is a mixture of two active ingredients: imazethapyr and glyphosate, which inhibit acetolactate synthase/acetohydroxyacid synthase (ALS/AHAS) and 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), respectively.

Weed populations may contain plants naturally resistant to various herbicide modes of action. Weed populations have been identified that are resistant to ALS/AHAS and/or EPSPS herbicides. Naturally occurring biotypes of some of the weeds listed on the label may not be effectively controlled by this and/or other products with either the ALS/AHAS and/or EPSPS modes of action. If resistant biotypes occur in the field, incorporate additional control methods for effective weed control such as additional approved herbicides with alternate modes of action or mechanical means.

Application Information


Extreme applied postemergence is effective in controlling weeds in conservation tillage as well as in conventional production systems. Apply Extreme to crops and weeds that are actively growing; base application timing on weed size and not crop growth stage.

A nonionic surfactant AND a nitrogen-based fertilizer must be added to the spray solution for optimum weed control. Apply NIS at 0.125% v/v of spray solution AND AMS at 2.5 lbs/A. See Mixing Instructions for directions.

When Extreme is applied postemergence, absorption will occur through both the roots and foliage. Susceptible weeds stop growing and either die or are not competitive with the crop. Extreme not only controls many existing broadleaf and grass weeds when applied postemergence, it also provides control of susceptible weeds that may emerge after application.

For maximum weed control where cultivation is possible, cultivate 7 to 10 days following a postemergence Extreme application to enhance residual weed control, especially under dry conditions.

Apply Extreme a minimum of 1 hour before rainfall or overhead irrigation.

Unusually cool temperatures (50° F or less) reduce photosynthesis and transpiration and, thus, reduce uptake, translocation, and weed control efficacy of Extreme.

If air temperature has been below 50° F for 10 or more hours, delay Extreme application for 48 hours after the temperature increases above 50° F to improve weed control and reduce crop response.

Application Instructions

DO NOT apply when winds are gusty, under low-level inversion conditions or under other conditions that favor drift. Maintain appropriate buffer zones between treated fields and adjacent desirable vegetation. Exposed leaves or other green tissue may be damaged or killed by drift from Extreme. Severe injury or plant death may result if Extreme contacts foliage of desirable plants. To prevent injury to desirable plants and crops, DO NOT allow spray drift to occur.

DO NOT allow the herbicide solution to drift onto desirable vegetation. Very small amounts of drift may cause injury or death to desirable crops or plants. The likelihood of injury from use of this product increases when winds are gusty. The risk of injury from this product increases when wind direction is constantly changing or during inversion conditions or other weather conditions that favor drift. Avoid applications using high spray pressure and high speed. These contribute to conditions that favor small spray droplets and drift.

When Extreme is used in combination with another herbicide, refer to the respective label for rates, methods of application, proper timing, weeds controlled, restrictions and precautions. Always use in accordance with the more restrictive label restrictions and precautions. DO NOT exceed label dosages. DO NOT mix Extreme with any product containing a label prohibiting such

To avoid injury to sensitive crops, drain spray equipment used for Extreme applications and thoroughly clean with water before applying other products.mixtures.

Ground Application

Uniformly apply with properly calibrated ground equipment in 10 or more gallons of water per acre. A spray pressure of 20 to 40 psi is recommended.

Aerial Application

Uniformly apply with properly calibrated aerial equipment in 5 or more gallons of water per acre. When applied postemergence, the addition of a nonionic surfactant AND fertilizer solution are required for optimum weed control. Apply nonionic surfactant (NIS) at 0.125% volume to volume (v/v) of spray solution AND ammonium sulfate (AMS) at 2.5 lbs/A. Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many equipment-related and weather-related factors determines the potential for spray drift. The applicator and the grower are responsible for considering all these factors when making decisions.

Sensitive Areas

The pesticide should only be applied when the potential for drift to adjacent sensitive areas (e.g. residential areas, bodies of water, known habitat for threatened or endangered species, or nontarget crops) is minimal (e.g. when wind is blowing away from the sensitive areas).

Applicator is responsible for any loss or damage which results from spraying Extreme herbicide in a manner other than specified in the label. In addition, applicator must follow all applicable state and local regulations and ordinances in regard to spraying.

Limitations, Restrictions, and Exceptions


Fall or Spring Burndown Application in a Planned Sequential Program with Lightning herbicide applied to Clearfield Corn.

Kentucky and Tennessee; South of Interstate 70 in Indiana Only.

Extreme herbicide may be applied at 3.0 pts/A as a fall or spring burndown application prior to planting Clearfield corn and/or prior to using Lightning in-crop to Clearfield corn.

- DO NOT apply Extreme to emerged Clearfield corn or crop injury will occur.

- DO NOT apply Counter® 15G insecticide to preplant Clearfield corn acres treated with Extreme or crop injury can occur.

- DO NOT plant wheat in the same year as application of Extreme followed by Lightning unless at least 10 inches of rainfall or overhead irrigation has occurred between application of Extreme and wheat planting.

Restricted Entry Interval

48 hours