General Information


CLETHODIM is for use on: Soybeans, Cotton, Ornamentals, Sugar Beets, Onions (dry bulbs and green), Garlic, Shallots (dry bulbs and green), Alfalfa, Peanuts, Dry Beans, Sunflower, Canola, Flax, Mustard Seed, Potato, Sweet Potato, Yam (and other Tuberous(1) and Corm(1) Vegetables), Tomatoes, Peppers (bell and non-bell), Eggplants (and other Fruiting Vegetables), Carrot, Radish, Garden Beet, Horseradish (and other Root Vegetables(2)), Leaf Lettuce, Broccoli, Cabbage, Cauliflower (and other Head and Stem Brassica Vegetables( 3)), Mustard Greens (and other Leafy Brassica Greens(4)), Spinach, Celery, Rhubarb (and other Leaf Petioles(5)), Cranberry, Strawberry, Squash (including Pumpkins), Cucumber, Melons (including Cantaloupes and Watermelons), Mint, Clover (grown in Idaho, Oregon and Washington only), Conifer Trees, Non-Bearing Food Crops, Fallow Land (and other non-producing agricultural areas) and Non-Crop or Non-Planted Areas.

(1)Other tuber and corm vegetables approved for use with CLETHODIM include: arracacha; arrowroot; Chinese artichoke; Jerusalem artichoke; edible burdock; edible canna; bitter and sweet cassava; chayote (root); chufa; dasheen (taro); ginger; leren; tanier; turmeric; and bean yam.

(2)Other root vegetables approved for use with CLETHODIM include: burdock, edible; celeriac; chervil, turnip-rooted; chicory; ginseng; parsley, turnip-rooted; parsnip; radish, oriental; rutabaga; salsify; salsify, black; salsify, Spanish; skirret and turnip.

(3)Other head and stem brassica vegetables approved include: Chinese broccoli; Brussels sprouts; Chinese (napa) cabbage; Chinese mustard; cavalo broccolo; and kohlrabi.

(4)Other leafy brassica greens approved for use with CLETHODIM include: broccoli raab, cabbage, Chinese (bok choy); collards; kale, mizuna, mustard greens; mustard spinach; rape greens and turnip greens.

(5) Other leaf petiole crops include: cardoon, Chinese celery, celtuce, Florence fennel, and Swiss chard.

CLETHODIM is a selective postemergence herbicide for control of annual and perennial grasses. CLETHODIM does not control sedges or broadleaf weeds. CLETHODIM is not recommended for use on vegetable crops being grown for seed production unless specific use directions are provided in the label.

In some grass species, repeated use of CLETHODIM (or similar postemergence grass herbicides with the same mode of action) may lead to the selection of naturally-occurring biotypes that are resistant to these products.

A resistant biotype may be present if poor performance occurs and cannot be attributed to adverse weather or application conditions.

This will most likely occur in fields where other control strategies such as crop rotation, mechanical removal, and other classes of herbicides are not used from year to year.

Do not allow CLETHODIM to contact desirable grass crops such as corn, rice, sorghum, small grains, or turf, as these and other grass crops will be injured or killed. Minor leaf spotting may occur on treated plants under certain environmental conditions. New foliage is not affected.

Control Symptoms

A reduction in vigor and growth is evident in treated grass weeds. Early chlorosis/necrosis of younger plant tissue is followed by a progressive collapse of the remaining foliage. Symptoms will generally be observed in 7 to 14 days depending on grass species treated and environmental conditions.


Application Timing

Apply CLETHODIM postemergence to actively-growing grasses according to rate table recommendations in the label. Do not apply to grass plants under stress from insufficient moisture or cold temperatures, or to grass plants exceeding recommended growth stages as unsatisfactory control may result.

In arid regions where irrigation is used to supplement limited rainfall, CLETHODIM should be applied as soon as possible after an irrigation (within 7 days). In arid regions, a second application of CLETHODIM will generally provide more effective control of perennial grass weeds than a single application. Make second application to actively-growing grass 2 to 3 weeks after emergence of new growth.

Cultivation of treated grasses 7 days prior to or within 7 days after application of CLETHODIM may reduce weed control. DO NOT APPLY CLETHODIM if rainfall is expected within one hour, since control may be reduced.

Ground Application

Use a minimum of 5 gallons and a maximum of 40 gallons of spray solution per acre. Use of sufficient spray volumes and pressure is essential to ensure complete coverage. Under the following conditions a minimum of 10 gallons per acre is required: narrow row soybeans, broadleaf herbicide tank-mixes, perennial grasses, volunteer corn, drought or stress conditions, heavy grass pressure or when grasses are at or near maximum height. Failure to use a minimum of 10 gallons per acre under these conditions can result in poor coverage and reduced grass control requiring repeat applications. Spray pressures should reflect a minimum of 30 psi and a maximum of 60 psi at the nozzle. Do not use flood nozzles.

Applications to onions (dry bulbs and green), garlic, and shallots (dry bulbs and green) should be made in a minimum of 20 gallons of spray solution per acre.

Air Application

Use a minimum of 3 gallons of spray solution per acre. As grass or crop foliage becomes dense, increase spray volume up to 10 gallons. For onions (dry bulbs and green), garlic, or shallots (dry bulbs and green): When applying by air do not exceed 8 fl. oz./A in a single application. In California, air applications to onions, garlic or shallots should be made in a minimum of 20 gallons of spray solution per acre.

NOTE: Crop injury may occur when CLETHODIM is applied to onions, garlic, or shallots with aerial equipment.

Spot Treatment

When using hand sprayers or high-volume sprayers utilizing hand guns, mix 1/4% to 1/2% (0.33 oz. to 0.65 oz. per gallon) CLETHODIM and treat to wet vegetation, while not allowing runoff of spray solution. For uses requiring crop-oil concentrate, include crop-oil concentrate at 1% (1.3 oz. per gallon) by volume. For uses requiring non-ionic surfactant, include non-ionic surfactant at 1/4% (0.33 oz. per gallon) by volume.

NOTE: If CLETHODIM is applied as a spot treatment, care should be taken to not exceed the maximum rate allowed on a “per acre” basis or crop injury may occur.



Do not apply if rain is expected within 1 hour of application as unsatisfactory control may occur.

Do not apply a postemergence broadleaf herbicide within one day following application of CLETHODIM or reduced grass control may result.

CLETHODIM is not recommended for use on vegetable crops being grown for seed production unless specific use directions are provided.

For canola, flax and mustard seed crops, do not apply more than 5 fl. oz. of CLETHODIM (0.08 lb. ai) per acre per season. For clover and radish crops, do not apply more than 16 fl. oz. of CLETHODIM (0.28 lb. ai) per acre per season. For all other crops, do not apply more than 32 fl. oz. of CLETHODIM (0.50 lb. ai) per acre per season.

Application on Long Island, New York, is restricted to no more than 16 fl. oz. of CLETHODIM (0.25 lb. ai) per acre per season.

Do not apply more than 8 fl. oz./A of CLETHODIM per application to the following crops: garden beets, carrots, radish (and other root vegetables), green onions, leaf lettuce, broccoli, cabbage, cauliflower (and other head and stem brassica vegetables), celery, rhubarb (and other leaf petioles), cranberry, cucurbits, fruiting vegetables (except tomatoes), non-bearing food crops, and strawberry. Do not apply more than 5 fl. oz./A of CLETHODIM per application to canola, flax, or mustard seed. Exceeding these recommendations may result in unacceptable crop injury.

Do not apply under conditions of stress. Applying CLETHODIM under conditions that do not promote active grass growth will reduce herbicide effectiveness. These conditions include drought, excessive water, extremes in temperature, low humidity and grasses either partially controlled or stunted from prior pesticide applications. Grasses under these kinds of stressful conditions will not absorb and translocate CLETHODIM effectively, and will be less susceptible to herbicide activity.

Best perennial grass control can be obtained if rhizomes or stolons are cut up by preplant tillage practices, (discing, plowing, etc.) to stimulate maximum emergence of grass shoots. Cultural practices, such as continuous no-tillage in which the perennial grass rhizomes or stolons are not cut up, result in a very staggered, non-uniform weed emergence. Due to this non-uniform weed emergence, no fewer than two CLETHODIM applications per season per year are recommended at the appropriate weed-growth stage rate under continuous no-till conditions.

Grass crops such as corn, rice, sorghum, small grains, or turf, etc. are highly sensitive to CLETHODIM.

While all vegetable crops on the label have been tested and are tolerant to CLETHODIM, not all specialty varieties of these crops have been tested. It is advised that, before applying CLETHODIM to specialty varieties of vegetable crops on the label, crop tolerance be investigated first using a small section of the field. It is possible that injury symptoms can occur. Symptoms may appear as leaf speckling or stunting.

Always read and follow the restrictions and limitations for all products whether used alone or in a tank-mix. The most restrictive labeling of any product used applies in tank-mixtures, including all crop rotational and other crop restrictions.

Tank-mixes of CLETHODIM and broadleaf herbicides may result in reduced grass control. If grass regrowth occurs, an additional application of CLETHODIM may be necessary.

Limitations, Restrictions, and Exceptions


In states other than California, air applications to onions, garlic or shallots should be made in a minimum of 10 gals./A.

For ground applications to garlic or shallots, do not exceed 8 fl. oz./A in a single application. For air applications to onion, garlic or shallots, do not exceed 8 fl. oz./A in a single application. For garlic and shallots do not exceed 2 applications per season. In CA for air applications to onions, do not exceed 2 applications per season.

If CLETHODIM is applied as a spot treatment to onions, garlic, shallots, or non-bearing food crops, care should be taken to not exceed the maximum rate allowed on a “per acre” basis or crop injury may occur.

In California, do not apply CLETHODIM to onions, garlic, or shallots until the crop has at least two full leaves. In California, 14- day spray intervals are recommended between the application of CLETHODIM and Liquid Nitrogen or other herbicide applications.

Injury to crop may occur when shorter intervals are observed.



Apply CLETHODIM at the high rate recommended for annual grasses (16 fl. oz. per acre) when the grass height is at the low end of the range (application to larger grasses may not provide adequate control). Add a crop-oil concentrate containing at least 15% emulsifier at 1 quart per acre.

Apply CLETHODIM in 0.1 to 0.2 acre-inch of water either at the end of a regular irrigation set or as a separate application not associated with a regular irrigation using the least amount of water that provides proper distribution and coverage. Application of more than label recommended quantities of irrigation water per acre may result in decreased product performance by removing the chemical from the zone of effectiveness. Use a metering device to inject CLETHODIM into irrigation water at a constant flow. Constant agitation must be maintained in the chemical supply tank during the entire period of herbicide application. Inject the product with a positive-displacement pump into the main line ahead of a right angle turn to ensure adequate mixing. Allow time for all lines to flush the herbicide through all nozzles before turning off irrigation water. To ensure the lines are flushed and free of remaining herbicide, a dye indicator may be injected into the lines to mark the end of the application period.

It is not recommended that CLETHODIM be applied through an irrigation system connected to a public water system. Public water system means a system for the provision to the public of piped water for human consumption if such system has at least 15 service connections or regularly serves an average of at least 25 individuals daily at least 60 days out of the year.

Use Precautions

1. Apply this product only through sprinkler irrigation systems including center-pivot, lateral-move, end-tow, side (wheel) roll, travelers, big gun, solid set, or hand move. Do not apply this product through any other type of irrigation system.

2. Crop injury, lack of effectiveness, or illegal pesticide residues in the crop may result from non-uniform distribution of treated water.

3. If you have any questions about calibration, you should contact State Extension Service specialists, equipment manufacturers or other experts.

4. Do not connect an irrigation system (including greenhouse systems) used for pesticide application to a public water system unless the label-prescribed safety devices for public water supplies are in place.

5. A person knowledgeable of the chemigation system and responsible for its operation or under supervision of the responsible person, shall shut the system down and make necessary adjustments should the need arise.

6. The system must contain a functional check-valve, vacuum-relief valve, and low-pressure drain appropriately located on the irrigation pipeline to prevent water source contamination from backflow.

7. The pesticide-injection pipeline must contain a functional, automatic, quick-closing check-valve to prevent the flow of fluid back toward the injection pump.

8. The pesticide-injection pipeline must also contain a functional, normally-closed solenoid-operated valve located on the intake side of the injection pump and connected to the system interlock to prevent fluid from being withdrawn from the supply tank when the irrigation system is either automatically or manually shut down.

9. The system must contain functional interlocking-controls to automatically shut off the pesticide-injection pump when the water-pump motor stops.

10. The irrigation line or water pump must include a functional pressure-switch which will stop the water-pump motor when the water pressure decreases to the point where pesticide distribution is adversely affected.

11. Systems must use a metering pump, such as a positive-displacement injection pump (e.g., diaphragm pump) effectively-designed and constructed of materials that are compatible with pesticides and capable of being fitted with a system interlock.

12. Do not apply when wind speed favors drift beyond the area intended for treatment.

Pre-Harvest Interval

15 days

Restricted Entry Interval

24 hours