Will Clethodim Kill Clover? How Selective Grass Control Works

Clethodim normally targets grasses rather than broadleaf clover, so properly labeled products can be useful for removing susceptible grassy weeds from certain clover systems.

However, “clethodim will not kill clover” should not be treated as a universal crop-safety guarantee.

Clethodim is a Group 1 ACCase-inhibiting herbicide in the cyclohexanedione, or DIM, chemical family. Its primary activity is against annual and perennial grasses after emergence. Clover is a broadleaf legume, which is why it is generally much less sensitive to clethodim’s intended herbicidal action than grasses.

For commercial buyers evaluating selective grass-control products, POMAIS supplies Clethodim herbicide for registered agricultural markets and professional weed-control programs.

Before using clethodim around clover, confirm:

• The exact clethodim product
• Whether clover is specifically listed
• Clover type and use
• Target grass species
• Grass growth stage
• Adjuvant requirements
• Grazing or forage restrictions
• Desirable grasses that must remain
• Destination-market registration

Biological selectivity does not replace the product label.

Will Clethodim Kill Clover?

Usually not through its intended mode of action.

Clethodim is designed to control susceptible grasses, while clover is a broadleaf plant.

This makes clethodim potentially useful when the goal is:

kill grass weeds while preserving labeled clover

Typical situations may include:

• Pure clover stands
• Clover seed production
• Selected forage-clover systems
• Wildlife food plots
• Clover fields invaded by annual grasses

But crop safety still depends on the exact product and use pattern.

Clethodim should not automatically be described as safe for:

• Every clover species
• Every clover variety
• Every food plot
• Every pasture
• Every formulation
• Every adjuvant program
• Every country or state

The more accurate statement is:

Clover is generally not clethodim’s target weed, but registered use and crop-safety instructions still control the application.

Why Does Clethodim Kill Grass but Usually Spare Clover?

Clethodim belongs to Group 1 herbicides that inhibit acetyl-CoA carboxylase, commonly abbreviated ACCase.

ACCase is involved in fatty-acid synthesis, which plants need for cell-membrane formation and new growth.

Group 1 ACCase Inhibition

When a susceptible grass absorbs clethodim through its leaves:

1. The herbicide moves into the plant.
2. It reaches active growing regions.
3. Sensitive ACCase activity is inhibited.
4. Fatty-acid production declines.
5. New tissue growth stops.
6. Growing points deteriorate.
7. The grass eventually dies if exposure is sufficient.

Clethodim is therefore not simply a contact leaf burner.

It is a systemic postemergence grass herbicide.

For a broader explanation of this distinction, see Contact vs Systemic Herbicides.

Why Broadleaf Clover Is Usually More Tolerant

Many broadleaf species, including clover, have a plastid ACCase system that is much less sensitive to DIM herbicides than the enzyme found in susceptible grasses.

That difference provides the biological selectivity.

The practical result is:

This is why clethodim can remove grassy competition without directly targeting clover.

Is Clethodim Actually Labeled for Clover?

This is one of the most important questions.

Registration is product-specific.

A clethodim product may be biologically selective to clover but still not be legally registered for that crop or use site.

Some U.S. clethodim labels include clover only under specific regional conditions. Other formulations may have different crop lists, application rates, adjuvant requirements, or harvest restrictions.

Before treatment, verify that the label specifically includes:

• Clover
• The intended clover use
• The target grass
• The application timing

Do not assume a product registered in:

• Soybean
• Cotton
• Alfalfa
• Vegetables
• Other broadleaf crops

is automatically approved for clover.

Likewise, a clethodim product legally used on clover in one country or state may not have the same registration elsewhere.

Are You Trying to Kill Clover or Protect Clover?

This distinction determines whether clethodim makes sense.

If the goal is to kill clover in a lawn, clethodim is generally unsuitable.

Why?

Clover is a broadleaf plant.

Most turfgrasses are grasses.

Clethodim may injure or kill the turfgrass while leaving the clover largely unaffected.

This is the opposite of what a lawn user normally wants.

Can Clethodim Be Used in Clover Food Plots?

Clethodim is often discussed in wildlife food-plot management because grass competition can become severe in established clover.

Potential grassy competitors include:

• Foxtails
• Crabgrass
• Barnyardgrass
• Volunteer cereals
• Ryegrass
• Johnsongrass
• Other susceptible annual or perennial grasses

Where the product label permits the use, clethodim may help reduce grass competition while maintaining clover.

However, food plot does not automatically mean labeled clover use.

A wildlife plot can contain multiple desired species, such as:

• Clover
• Chicory
• Cereal grains
• Brassicas
• Grasses

Clethodim may spare broadleaf components while severely injuring desired cereal or grass components.

Before spraying a mixed plot, identify every planted species.

If the plot includes desirable:

• Rye
• Wheat
• Oats
• Millet
• Sorghum
• Other grasses

clethodim may remove them along with the grassy weeds.

Can Clethodim Be Used in Clover Pastures?

This requires more caution than a pure clover stand.

A mixed pasture may contain both:

• Clover
• Desirable forage grasses

For example:

• Tall fescue
• Orchardgrass
• Ryegrass
• Bermudagrass
• Timothy
• Other forage grasses

Clethodim does not distinguish between a grassy weed and a desirable forage grass based on the grower’s intention.

Desirable grasses can also be injured or killed.

Therefore, clethodim may be a poor fit if the management objective is to preserve both clover and the grass component.

The question should not be:

Is clethodim safe for clover pasture?

It should be:

Which plants in this pasture do I want to preserve?

If the answer includes desirable grasses, a selective grass herbicide may conflict with the production goal.

What Grass Weeds Can Clethodim Control?

Clethodim has a broad grass spectrum, but exact claims depend on the product label.

Potential targets may include selected:

• Foxtail species
• Crabgrass
• Barnyardgrass
• Volunteer cereals
• Ryegrass
• Johnsongrass
• Quackgrass
• Bermudagrass
• Annual bluegrass
• Other annual or perennial grasses

Control level can vary between:

• Control
• Suppression
• Temporary growth reduction

Perennial grasses are often harder to manage because they can regenerate from:

• Rhizomes
• Stolons
• Crowns
• Underground buds

The label may therefore require different application timing or repeat-treatment strategy for perennial grasses.

Do not convert one grass-use rate into a universal rate for all grass species.

Will Clethodim Kill Fescue in Clover?

Fescue is a grass.

Therefore, clethodim can potentially injure or kill susceptible fescue.

This distinction is important in mixed clover-fescue pastures.

If tall fescue is part of the desired forage stand, clethodim may not be an appropriate broadcast treatment.

If fescue is an unwanted contaminant in a clover-dominant stand, clethodim may be useful where the exact product label supports that use.

The herbicide cannot distinguish between:

desirable fescue

and:

unwanted fescue.

Will Clethodim Kill Ryegrass?

Ryegrass is also a grass and may be susceptible to clethodim.

Actual performance depends on:

• Ryegrass species
• Growth stage
• Herbicide resistance
• Application conditions
• Product label

Resistance is especially important because some ryegrass populations have developed resistance to Group 1 ACCase herbicides.

Poor ryegrass control should not automatically be blamed on low dose or poor product quality.

Will Clethodim Kill Bermudagrass?

Clethodim can suppress or control bermudagrass in selected labeled situations, but bermudagrass is a perennial species with stolons and rhizomes.

It may require a different program from annual grass control.

Results depend on:

• Active growth
• Application timing
• Label rate
• Regrowth
• Environmental conditions

Do not promise complete eradication from one application.

When Should Clethodim Be Applied in Clover?

Clethodim works best on actively growing grass weeds that remain within the size and growth-stage limits listed on the label.

Apply After Grass Emerges

Clethodim is primarily a postemergence herbicide.

It is not designed to provide broad preemergence grass control from the soil.

The target grass normally needs to have emerged and developed enough leaf area to absorb the treatment.

Grass Size Matters

Smaller, actively growing grasses are generally easier to control than:

• Mature grasses
• Seed-producing plants
• Drought-stressed grasses
• Heavily tillered grasses
• Established perennial grasses

The exact maximum height or growth stage varies by species and product.

Avoid Severely Stressed Grass

Performance may decline when grasses are under stress from:

• Drought
• Extreme heat
• Unusually low temperature
• Nutrient stress
• Heavy grazing
• Disease
• Other herbicides

Systemic herbicides depend on active plant growth and movement into growing tissues.

If the grass is barely growing, herbicide movement and response can become less predictable.

Does Clethodim Need Crop Oil in Clover?

Do not assume that crop oil concentrate is always required.

Clethodim labels often include adjuvant requirements, but adjuvant instructions are crop- and product-specific.

Some clethodim labels use:

• Crop oil concentrate
• Methylated seed oil
• Nonionic surfactant

depending on the crop and application.

However, certain clover directions specifically prohibit crop oil concentrate even though COC may be recommended elsewhere on the same label.

This is a critical point.

A general statement such as:

Clethodim always requires 1% crop oil.

is not appropriate for a clover guide.

Instead:

1. Find the clover section of the exact product label.
2. Check whether an adjuvant is required.
3. Confirm which adjuvant type is permitted.
4. Follow the specified concentration.
5. Do not transfer adjuvant directions from soybean or another crop automatically.

Do not assume crop oil concentrate is always required in clover.

Does Rain Affect Clethodim Performance?

Yes.

Clethodim needs enough time after application for foliar uptake.

The required rain-free interval varies by product.

Some labels specify approximately one hour, while other formulations or markets may differ.

Do not use one generic rainfast number for every clethodim product.

If rain occurs soon after spraying:

• Check the exact label
• Consider how long the spray remained on the leaves
• Do not automatically reapply
• Confirm seasonal application limits first

Repeated applications outside the label can create crop, residue, or compliance problems.

Can Livestock Graze Clover After Clethodim Application?

Only after the required label interval has been satisfied.

This is particularly important when treated clover is used for:

• Grazing
• Hay
• Silage
• Forage
• Livestock feed

Some U.S. clethodim labels specify a 15-day interval before grazing, feeding, or cutting treated clover for forage or hay.

That is a product-specific example, not a universal clethodim rule.

Other products or countries may use different restrictions.

Before treating forage clover, confirm:

• Grazing interval
• Cutting interval
• Hay restriction
• Feeding restriction
• Harvest interval

A treatment can be agronomically effective but still unsuitable if the planned grazing schedule cannot meet the label.

What About Wildlife Food Plots?

Wildlife re-entry and forage use should also follow the product label.

A food plot intended for deer, livestock, or other animals should not be treated based only on the assumption that:

clethodim is safe because it does not kill clover.

The relevant questions include:

• Is the crop/use registered?
• Is treated forage intended for consumption?
• Is there a grazing or feeding interval?
• Are other planted species sensitive?
• Can the interval be met before animals return?

Follow the actual label rather than an informal food-plot recipe.

What If Broadleaf Weeds Are Also Present?

Clethodim does not provide broad-spectrum control of broadleaf weeds.

It generally will not solve problems such as:

• Dandelion
• Thistle
• Ragweed
• Pigweed
• Dock
• Plantain
• Other broadleaf weeds

That includes clover itself.

If the field has both grassy and broadleaf weeds, the weed-management program may need different tools.

Do not automatically add:

• 2,4-D
• Dicamba
• Glyphosate
• Another broadleaf herbicide

because many such products can injure or kill the clover you are trying to protect.

Select a separate herbicide or management strategy specifically labeled for the clover crop and target broadleaf weeds.

Is Clethodim Systemic?

Yes.

Clethodim is absorbed mainly through grass foliage and moves toward active growing points.

This systemic movement helps explain its activity against perennial grasses, where the target is not only the visible leaf tissue.

After successful treatment, grasses may initially remain green.

Typical response can include:

• Growth stopping
• Growing-point discoloration
• Yellowing
• Browning
• Easy separation of the newest central leaf in some species
• Gradual plant death

Do not judge performance only a few hours after application.

How Long Does Clethodim Take to Kill Grass?

There is no universal time-to-death.

Visible symptoms may develop gradually because clethodim inhibits growth rather than immediately burning leaf tissue.

Response depends on:

• Grass species
• Grass age
• Temperature
• Soil moisture
• Growth rate
• Application rate
• Resistance status

Perennial grasses may respond more slowly than small annual grasses.

A slow visual response does not automatically mean the herbicide failed.

What About Clethodim-Resistant Grass?

Clethodim belongs to Group 1 ACCase inhibitors.

Resistance to this herbicide group has been documented in several important grass weeds.

Potential resistant species may include populations of:

• Ryegrass
• Wild oats
• Foxtails
• Barnyardgrass
• Other grasses

Resistance can result from:

• Changes at the ACCase target site
• Enhanced metabolism
• Other resistance mechanisms

If a population has Group 1 resistance, changing from clethodim to another Group 1 herbicide may not provide reliable control.

Another ACCase inhibitor is not automatically a true mode-of-action rotation.

Resistance management should include:

• Different effective herbicide groups
• Crop rotation
• Mowing where appropriate
• Preventing seed production
• Cultural competition
• Mechanical control
• Field scouting

Do not repeatedly increase clethodim rate to compensate for suspected resistance.

Can Clethodim Injure Clover?

Clethodim’s primary mode of action is not directed at clover, but visible crop response can still occur under unsuitable conditions.

Potential contributing factors include:

• Wrong formulation
• Excessive rate
• Inappropriate adjuvant
• Tank-mix interaction
• Crop stress
• Off-label use
• Solvent or adjuvant effects

This is another reason not to equate:

not a target plant

with:

impossible to injure.

If clover injury occurs, review:

• Product
• Rate
• Adjuvant
• Tank partners
• Weather
• Crop stage
• Application records

before concluding that clethodim itself caused direct ACCase injury.

How Should Importers and Distributors Evaluate Clethodim?

B2B buyers should evaluate clethodim according to the target grass-control market rather than active ingredient concentration alone.

Compare the Complete Use Pattern

Two clethodim products with the same nominal concentration can still differ in:

• Solvent system
• Emulsification
• Adjuvant directions
• Registered crops
• Grass spectrum
• Grazing restrictions
• Packaging
• Local label

For an importer, a product is commercially useful only when its registration matches the intended crop and weed-control program.

Frequently Asked Questions

Will clethodim kill clover?

Clethodim normally targets grasses rather than broadleaf clover, so clover is generally tolerant where the product is correctly registered and used.

Will clethodim kill white clover?

White clover is a broadleaf legume and is generally not the intended target of clethodim. Confirm that the exact product is labeled for the intended white-clover use.

Will clethodim kill red clover?

Red clover is also a broadleaf legume and is generally much less sensitive to clethodim than grasses. Product registration still matters.

Can clethodim be used in a clover food plot?

Potentially, where the exact product label permits the use. Check other desired species in the food plot before spraying.

Will clethodim kill grass in clover?

It can control many susceptible grass weeds in labeled clover systems.

Will clethodim kill fescue?

Fescue is a grass and can be injured or killed. This is important in mixed clover-fescue pasture.

Will clethodim kill ryegrass?

Clethodim may control susceptible ryegrass, but Group 1-resistant ryegrass populations can survive.

Will clethodim kill bermudagrass?

It can suppress or control bermudagrass under some labeled programs, but perennial regrowth may require additional management.

Can clethodim be used to kill clover in a lawn?

No. Clethodim primarily targets grasses and may injure the turf while leaving the clover.

Does clethodim kill dandelions?

No. Dandelions are broadleaf weeds and are not the normal target of clethodim.

Is clethodim systemic?

Yes. It is a systemic postemergence Group 1 grass herbicide.

What herbicide group is clethodim?

Clethodim belongs to HRAC/WSSA Group 1 ACCase inhibitors and the DIM chemical family.

Does clethodim need crop oil in clover?

Not always. Some clover directions specifically prohibit crop oil concentrate. Follow the exact product label.

Can animals graze clover after clethodim?

Only after the required product-specific interval. Some U.S. labels use a 15-day interval for certain clover uses, but this is not universal.

How long does clethodim take to kill grass?

Visible control normally develops gradually and varies by grass species, growth stage, weather, and resistance.

Can clethodim kill desirable pasture grass?

Yes. Clethodim targets susceptible grasses whether they are considered weeds or desirable forage species.

Does clethodim kill sedges?

Clethodim is primarily a grass herbicide and does not provide reliable broad sedge control.

Can grass become resistant to clethodim?

Yes. Resistance to Group 1 ACCase herbicides is documented in several grass species.

Is every clethodim product labeled for clover?

No. Clover registration can be product- and region-specific.

Use Clethodim to Target Grass—Not to Assume Universal Clover Safety

Clethodim can be an effective tool for removing susceptible grasses from certain clover systems because the herbicide primarily targets Group 1-sensitive grasses rather than broadleaf clover.

The most important points are:

• Clethodim is a Group 1 DIM ACCase inhibitor
• Clover is generally not the target weed
• The product must still be registered for clover
• Food plots, forage fields, lawns, and mixed pastures are different use situations
• Clethodim can kill desirable grasses as well as grassy weeds
• Adjuvant requirements must come from the clover-specific label
• Grazing and forage intervals are product-specific
• ACCase-resistant grasses may survive treatment

For importers, distributors, and private-label herbicide buyers evaluating commercial grass-control programs, POMAIS provides Clethodim formulations for professional grass control for registered agricultural markets.

The correct use decision is not simply:

Will clethodim kill clover?

It is:

Is this exact clethodim product registered for this clover system, will it control the target grass, will it also remove desirable grasses, and can the required adjuvant, grazing, and resistance-management conditions be met?