Dow AgroSciences
Registered until
Registration number
Active materials


Field sprayer application
DO NOT apply during periods of dead calm. Avoid application of this product when winds are gusty. DO NOT apply with spray droplets smaller than the American Society of Agricultural Engineers (ASAE) coarse classification. Boom height must be 60 cm or less above the crop or ground.

Aerial application
DO NOT apply during periods of dead calm. Avoid application of this product when winds are gusty. DO NOT apply when wind speed is greater than 16 km/h at flying height at the site of application. DO NOT apply with spray droplets smaller than the American Society of Agricultural Engineers (ASAE) coarse classification. To reduce drift caused by turbulent wingtip vortices, the nozzle distribution along the spray boom length MUST NOT exceed 65% of the wingspan or rotorspan.


Grazing Restriction
Do not permit lactating dairy animals to graze fields within 7 days after application.
Do not harvest forage or cut hay within 7 days after application.
Withdraw meat animals from treated fields at least 3 days before slaughter.

Restricted Entry Interval (REI)
All crops – 12-hour REI

Ground Application
Apply 50 to 200 L of spray solution per hectare depending on the type of application equipment used.
Use sufficient water for even distribution. Spray at low pressures (200 to 275 kPa) when the weeds are actively growing.

Aerial Application (including fixed and rotary wing aircraft)
Apply a minimum of 30 L of spray solution per hectare depending on the type of application system being used. Use boom pressures of 235 kPa or less. Avoid placing nozzles where spray will enter wing tip vortices.

To Prepare A Spray

Add half the required amount of water or oil to the spray tank, then add with agitation the required amount of product as shown for the different uses, and finally the balance of the water or oil with continued agitation. Provide agitation to ensure uniformity of spray mixture.

Spot Treatment

For spot treatment of weeds such as thistles using knapsacks, mix 20 ml of product/L of spray solution.
Wet all foliage thoroughly.

Selective Weed Control in Small Grains

Do not use on grain interplanted with a legume. Weeds differ in their susceptibility to MCPA LV 500 Herbicide and not all types can be controlled satisfactorily in crops. The
amount of product to use will depend upon the susceptibility and whether the crops will tolerate this amount. Where specific rates are recommended for a crop in this Crop Use section, DO NOT exceed t hose specific rates.


Oats are more tolerant to MCPA than 2,4-D. Spray when conditions of weeds warrant up to the flag-leaf stage (shot blade). Maximum 1 application per year.

Wheat, Barley and Rye

MCPA LV 500 Herbicide is used for the control of susceptible weeds in wheat, barley and rye. Treatments can be made from the 3-leaf expanded to the early flag-leaf stage.
Treatments made between emergence and 3-leaf stage may cause some crop injury, but are less likely to with MCPA LV 500 Herbicide than with 2,4-D esters. Winter wheat and fall rye should be treated in early spring, as soon as weeds appear and when the crop is in full tillering stage to the shot-blade stage. Maximum 1 application per year.

Flax (linseed) (Do not use on low linolenic acid varieties)

Treat flax with MCPA LV 500 Herbicide when flax is 5 cm tall to just before the buds begin to form. When weeds resistant to MCPA are present, use 2,4-D Amine 500 herbicide; however, some crop injury to the flax should be expected. Rates of MCPA LV 500 Herbicide over 1.1 L/ha may cause a delay in maturity which is usually more than offset by increased yield caused by weed control. Maximum 1 application per year. 

Treat asparagus with MCPA LV 500 Herbicide following a cultivation just before the first spears appear. Use 3.5 L/ha. Treatment may be repeated at the end of the cutting season.
Maximum 2 applications is permitted per season with a minimum retreatment interval of 21 days.

Established Grasses - Eastern Canada
For the control of yellow rocket and other susceptible winter annual weeds, spray with 2 L of MCPA LV 500 Herbicide/ha. Application should be made in early fall.

Established Legumes (Alfalfa) and Grasses - Western Canada
To control such susceptible weeds as horsetail, hoary cress, shepherd‟s purse and other perennials or winter annuals, spray with MCPA LV 500 Herbicide at 1.1 to 2.0 L/ha before growth of legumes and grasses starts in the spring.

Rangeland and Grass Pasture

To control susceptible weeds use 1.5 to 2.75 L/ha in enough water for coverage.
For established grasses, pastures and rangeland, and established legumes, a maximum of 2 applications per season is permitted, with a minimum retreatment interval of 90 days.



For Aerial Application

Do not spray when winds exceed 16 kmph. Do not spray in dead calm near sensitive plants. The “cloud” of suspended droplets may drift onto sensitive plants when the wind comes up. Spray only when wind is blowing away from a sensitive crop, shelterbelt or garden.

Directions for Use

Apply only by fixed-wing or rotary aircraft equipment which has been functionally and operationally calibrated for the atmospheric conditions of the area and the application rates and conditions of this label.
Label rates, conditions and precautions are product specific. Read and understand the entire label before opening this product. Apply only at the rate recommended for aerial application on this label. Where no rate for aerial application appears for the specific use, this product cannot be applied by any type of aerial equipment.
Ensure uniform application. To avoid streaked, uneven or overlapped application, use appropriate marking devices

Use Precautions
Apply only when meteorological conditions at the treatment site allow for complete and even crop coverage. Apply only under conditions of good practice specific to aerial application as outlined in the National Aerial Pesticide Application Manual, developed by the Federal/Provincial/Territorial Committee on Pest Management and Pesticides.
Do not apply to any body of water. Avoid drifting of spray onto any body of water or other non-target areas. Specified buffer zones should be observed.
Coarse sprays are less likely to drift, therefore, avoid combinations of pressure and nozzle type that will result in fine particles (mist). Do not apply during periods of dead calm or when wind velocity and direction pose a risk of spray drift. Do not spray when the wind is blowing towards a nearby sensitive crop, garden, terrestrial habitat (such as shelter-belt) or aquatic habitat.

Operator Precautions
Do not allow the pilot to mix chemicals to be loaded onto the aircraft. Loading of premixed chemicals with a closed system is permitted.
It is desirable that the pilot have communication capabilities at each treatment site at the time of application.
The field crew and the mixer/loaders must wear long-sleeved shirt, long pants and coveralls, chemical resistant gloves and goggles or face shield during mixing/loading, cleanup and repair. Follow the more stringent label precautions in cases where the operator precautions exceed the generic label recommendations on the existing ground boom label.
All personnel on the job site must wash hands and face thoroughly before eating and drinking.
Protective clothing, aircraft cockpit and vehicle cabs must be decontaminated regularly.

Tank Mixtures

In some cases, tank mixing a pest control product with another pest control product or a fertilizer can result in biological effects that could include, but are not limited to: reduced pest efficacy or increased host crop injury. The user should contact Dow AgroSciences Canada Inc at 1-800-667-3852 or for information before mixing any pesticide or fertilizer that is not specifically recommended on this label. The user assumes the risk of losses that result from the use of tank mixes that do not appear on this label or that are not specifically recommended by Dow AgroSciences Canada Inc.

Product Specific Precautions

Read and understand the entire label before opening this product. If you have questions, call the manufacturer at 1-800-667-3852 or obtain technical advice from the distributor or your provincial agricultural representative. Application of this specific product must meet and/or conform to the following:
Volume: Apply the recommended rate in a minimum spray volume of 30 litres per hectare.

Sensitive Plants

Vegetables, flowers, grapes, fruit trees and other desirable plants are sensitive to MCPA even in minute quantities. Care should be taken to avoid spraying these types of plants or allowing spray mist to drift onto these plants during both their growing and dormant periods. Coarse sprays are less likely to drift. At higher temperatures, vaporization may cause injury to susceptible plants growing nearby.
This product may cause damage to lawns or pastures if applied before the grass is well established. In addition, most legumes may be damaged or killed.

Local conditions may affect the use of herbicides. Provincial agricultural authorities issue recommendations to fit local conditions. Be sure that use of this product conforms to all applicable regulations.
If this product is exposed to temperatures below -20 C, it should be warmed to at least 5.0 C and mixed thoroughly before using.

Buffer zones are not required for applications with handheld or backpack equipment and spot treatment.
The buffer zones specified in the table below are required between the point of direct application and the closest downwind edge of sensitive terrestrial habitats (such as grasslands, forested areas, shelter belts, woodlots, hedgerows, riparian areas and shrublands), sensitive freshwater habitats (such as lakes, rivers, sloughs, ponds, prairie potholes, creeks, marshes, streams, reservoirs and wetlands) and estuarine/marine habitats.

For resistance management, MCPA LV 500 Herbicide is a Group 4 herbicide. Any weed population may contain or develop plants naturally resistant to MCPA LV 500 Herbicide and other Group 4 herbicides. The resistant biotypes may dominate the weed population if these herbicides are used repeatedly in the same field. Other resistance mechanisms that are not linked to site of action, but specific for individual chemicals, such as enhanced metabolism, may also exist. Appropriate resistance-management strategies should be followed.
To delay herbicide resistance:
Where possible, rotate the use of MCPA LV 500 Herbicide or other
Group 4 herbicides with different herbicide groups that control the same weeds in a field. 
Use tank mixtures with herbicides from a different group when such use is permitted.
Herbicide use should be based on an IPM program that includes scouting, historical information related to herbicide use and crop rotation, and considers tillage (or other mechanical), cultural, biological and other chemical control practices.
Monitor treated weed populations for resistance development.
Prevent movement of resistant weed seeds to other fields by cleaning harvesting and tillage equipment and planting clean seed.
Contact your local extension specialist or certified crop advisors for any additional pesticide resistance-management and/or integrated weed-management recommendations for specific crops and weed biotypes.

: This pest control product is to be used only in accordance with the directions on the label. It is an offence under the Pest Control Products Act to use this product in a way that is inconsistent with the directions on the label. The user assumes the risk to persons or property that arises from any such use of this product.

Registered for culturesRatePreharvest Interval
Asparagus3.5 l7
Winter wheat0.7 - 1.75 l7
Spring wheat0.7 - 1.75 l7
Spring barley0.7 - 1.75 l7
Winter barley0.7 - 1.75 l7
Winter rye0.7 - 1.75 l7
Spring rye0.7 - 1.75 l7
Winter oats0.7 - 1.75 l7
Spring oats0.7 - 1.75 l7
Winter flax0.7 - 1.75 l7
Spring flax0.7 - 1.75 l7