New Zealand - English - Ministry for Primary Industries

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Active ingredient:
Available from:
Landmark Operations (NZ) Ltd
clethodim 360 g/litre
Authorization number:
Authorization date:


Keep out of reach of children



A selective post-emergent herbicide for grass weed control in broadleaf crops and forestry.

ACTIVE INGREDIENT: Contains 360g/L clethodim in the form of an emulsifiable concentrate

Also contains 582 g/L dearomatised hydrocarbon solvent and 17.5 g/L calcium dodecylbenzene sulphonate.

Registered to:

Relyon NZ Limited

C/o KPMG, The Terrace

Level 5, 79 Cashel Street

Christchurch 8001

Distributed by:

Farmlands Co-operative Society Limited

535 Wairakei Road, Burnside

Christchurch 8053

Tel 0800 200 600

Net Contents: 1, 5, 20, 200 L




3.1D, 6.1E, 6.3A, 6.4A, 6.9B, 9.1C, 9.2A, 9.3C

QUALIFIED HANDLER This product must be under the control of a qualified handler during use.

Clethora must not be applied into or onto water.

Clethora must be applied via ground-based method only.

Record Keeping: Records of use as described in NZS 8409 Management of Agrichemicals must be

kept if using 3 litres or more of Clethora within 24 hours.


Combustible liquid; keep away from naked flame. No smoking.


May be harmful if swallowed and if aspirated into lungs. May cause skin and eye irritation. May cause

liver damage from repeated oral exposure at high doses.


Harmful to aquatic plants. Avoid contamination of any water supply with product or empty container.

Very toxic to some plant species. Do not allow drift to occur outside the target area.

Harmful to terrestrial vertebrates.



Keep out of reach of children. Do not store near heat or flame. Store in original container tightly closed

and in a locked, dry, cool area away from sources of ignition and foodstuffs. Store in accordance with

NZS 8409 Management of Agrichemicals. Stores containing 100 litres are subject to signage, 1000 litres

of Clethora require secondary containment and more than 1000 litres require emergency response

plans. Stores containing 500 litres of GRASIDIM must have at least 2 fire extinguishers.


Avoid skin and eye contact and inhalation of spray mist. When mixing or applying wear eye protection,

chemically resistant gloves and boots, and overalls. Remove protective clothing and wash hands and

face thoroughly before meals and after work.


Triple rinse empty container and add rinsate to the spray tank. If recycling, discard cap and deliver clean

container to an Agrecovery depot. Otherwise crush and bury in a suitable landfill. Dispose of product

only by using according to the label, or at an approved landfill. Do not burn.

First Aid

If swallowed do not induce vomiting. If splashed in eyes, wash out immediately with running water for

several minutes. If skin or hair contact occurs, remove contaminated clothing and wash with soap and

running water. If inhaled, immediately move to fresh air and rest. Maintain half upright position if breathing

is difficult. Call the National Poisons Centre 0800 POISON (0800 764 766) (24hrs) or a doctor

immediately for advice.

Emergency Response

In a transport emergency call 111, Police or Fire Brigade. For specialist advice in an emergency only, call

0800 CHEMCALL (0800 243 6225) (24hrs).


Extinguish all ignition sources, exclude all bystanders from the vicinity of the spill and prevent material

from entering waterways. Wear appropriate protective clothing. Absorb spills with inert material and place

in waste containers. Wash area with water and absorb with further inert material. Dispose of waste safely

in an approved landfill.


Do not carry more than 1 litre of Clethora on a passenger service vehicle.


Half fill the spray tank and with the agitator operating and add the correct volume of Clethora. Add the

remainder of the water then add the adjuvant and agitate thoroughly before using. After standing, agitate

spray solution well before reusing.


Clethora is compatible with terbuthylazine and clopyralid. Do not apply in combination with other herbicides

unless experience shows that efficacy is not affected. Do not apply within 7 days of phenoxy herbicides.


Apply using well maintained spray equipment that is accurately calibrated to apply 100-400 litres of water

per hectare. Use nozzles and pressures that produce a droplet size of 150–300 microns VMD. Use the

high water rate for dense grass infestations. Clean equipment thoroughly after use.

Resistance Management

Clethora contains a herbicide from the cyclohexanedione group and has the inhibition of acetyl coA

carboxylase mode of action. Some naturally-occurring weed biotypes resistant to Clethora and other Group

A Herbicides may exist through normal genetic variability in any weed population. The resistant individuals

can eventually dominate the weed population if these herbicides are used repeatedly. These resistant

weeds will not be controlled by Clethora or other Group A Herbicides.


For best results apply to young actively growing grass weeds. Do not apply to plants under stress from

drought or waterlogging. Use the lower rate on seedling grass weeds (2–5 leaf) or actively regenerating

rhizomes, and the higher rate on tillering plants or hardy rhizomatous grasses. On established sod-bound

rhizomatous grasses and established turf ryegrass in non-cultivated crops, suppression only may be

obtained. On crops which have been grazed, remove stock and allow grasses to freshen up for a few days

(5–10cm new growth) before treating. To minimise any possible crop damage, avoid spray overlaps.

Clethora is considered to be rainfast if applied at least one hour before rainfall.

Always add an emulsifiable crop mineral oil at 2.0 litres/ha with all applications.


Critical Comments

White clover seed

Apply after closing up, to control annual and perennial ryegrass and other

grass weeds.

Legume feeds

(e.g. lucerne, lupins,

clover,lotus, trefoil)

To control annual and perennial ryegrass and other grass weeds.



Apply when grass seedlings are small (typically 3–6 weeks after planting)

and well before canopy closure.

Forage herbs

(e.g. plantain, chicory)

To control annual and perennial ryegrass and other grass weeds. Do not

apply Clethora to plantain seed crops after flower heads are first visible in

the base of the plants.


To control actively growing grass weeds. Apply as a directed spray to the

base of the trees to avoid fruit contact.


To control actively growing grass weeds. Do not apply more than 670 ml/ha.

Crop safety has been demonstrated on onions, carrots and lettuce. Where

crop safety is unknown, a small area should be treated before widespread

application. NB: Asparagus

do not apply during the cutting period.

Peas, lentils, oilseed rape

To control wild oats. Apply 170 ml/ha when the majority of oats are in the

2–5 leaf growth stage. A temporary effect on leaf colour and sheen may

occur in peas. This does not affect crop vigour or yield.


(Radiata pine,

Macrocarpa, Douglas fir)

Do not exceed 670 ml/ha.

Tree release – Spot treatment: Use 23 ml Clethora plus 100ml emulsifiable

crop oil per ten litres of water. Apply 20 ml spray solution per square metre.

To control broadleaf weeds and for residual control, apply in combination

with terbuthylazine at recommended label rates.


Grass Species

Rates /ha









summergrass, floating sweet grass, canary grass, bristle grass, volunteer cereals

Note: Turf ryegrasses and tillered cereals will only be suppressed at these rates.

170 - 330 ml

Annual poa, smooth witchgrass, soft brome, phalaris, tall fescue, prairie grass,

ripgut brome, browntop, barley grass.

Note: Chewings fescue, Yorkshire fog and hairgrass will be suppressed but not

controlled at these rates.

330 - 670 ml

Couch, paspalum, Indian doab

1.3 – 2.0 litres

It is an offence for users of this product to cause residues exceeding the relevant MRL in the Food

Notice: Maximum Residues Limits of Agricultural Compounds.


Vegetable crops - 5 weeks.

Legume crops, forage herbs and fodder brassica crops - 3 weeks.


This formulation is warranted to contain the specified active ingredient within accepted analytical tolerance

when packed. The user bears the risk for damage resulting from factors beyond the Manufacturer’s control.

The manufacturer declines all liability for damage resulting from improper storage or use of the product.

Registered pursuant to the ACVM Act 1997, P9714


for registration conditions.

Approved under the HSNO Act 1996, HSR100921

See for Controls.

Ref No P9714-01

Public Record of Delegate Decision

For granting an application for registration under section 21 of the Agricultural Compounds and Veterinary

Medicines Act 1997

Product details

Trade name


Ref No



Relyon NZ Limited

Application type


Date of Delegate


29 July 2019


Expiry Period

This registration will expire 5 years from the date of this Delegate’s Decision.





Application eligible with no CI to protect

Summary of reasons for the Decision to grant the Application

Except for the trade name and registrant details, this product is identical in all respects to an already registered


Recommendation to Register

On the basis of the above information, the product as approved, and when imported, manufactured, sold or used

in accordance with the conditions listed below, is not likely to cause unacceptable risks to:

public health

trade in primary produce

animal welfare or

agricultural security.

In balance, there are sufficient benefits to warrant this product to be registered.

When used in accordance with this approval, the product is not likely to cause residues in primary produce, food

or food-related products that would breach domestic food residue standards.

The assessed label content is adequate to provide sufficient consumer information to allow the product to be used

appropriately and safely and meets labelling requirements.

Delegate’s decision

Being satisfied of the matters above, and under delegated authority pursuant to the Agricultural Compounds and

Veterinary Medicines Act 1997, this application for registration is granted, under section 21(1)(d) under the

conditions as listed on the Register.

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