Weed Force Thiss-Off Thistle & Broadleaf Herbicide

Weed Force Thiss-Off Thistle & Broadleaf Herbicide contains 750 g/L MCPA present as the dimethylamine salt, providing selective post-emergent control of thistles and broadleaf weeds in cereals, pastures, turf, sugar cane, rice, and non-crop areas across all Australian states.

As a Group 4 phenoxy herbicide, Thiss-Off disrupts plant cell growth in susceptible broadleaf species, including saffron, spear, variegated, artichoke, and nodding thistles, while leaving established grasses intact. The product mixes readily with water and suits boom spray, aerial, and knapsack application, with registered tank mix partners including clopyralid, metsulfuron-methyl, diuron, dicamba, and bromoxynil for broader weed spectrum control. Thiss-Off also supports spot spraying via knapsack at 13–27 mL per 10 litres of water, making it practical for mixed small-property use.

Pack Sizes: 5L & 20L. Registrant: WeedForce Pty Ltd (APVMA #: 83914/109240)
Similar or comparable to Conquest MCPA 750 Herbicide, Nufarm MCPA Amine 750 Herbicide (Agritone) & Apparent MCPA 750 Selective Herbicide

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Description

Weed Force Thiss-Off Thistle & Broadleaf Herbicide — MCPA 750 Selective Control

Weed Force Thiss-Off Thistle & Broadleaf Herbicide contains 750 g/L MCPA present as the dimethylamine salt. WeedForce Pty Ltd registered Thiss-Off as a Group 4 phenoxy herbicide. As such, it disrupts plant cell growth in susceptible broadleaf species while leaving established grasses intact. Moreover, the product delivers selective post-emergent control across cereals, pastures, turf, sugar cane, and non-crop areas throughout Australia. It mixes readily with water and suits boom spray, aerial, and knapsack application.

MCPA acts on plant auxin pathways, giving Thiss-Off selective activity across multiple broadleaf species. Rates and timing vary by state and crop situation. In grain-growing situations, growers can apply Thiss-Off during tillering within state-specific windows. Additionally, Thiss-Off suits established grass-based pastures, so producers can target broadleaf weeds without damaging the grass base.

Thistle Control Across Pastures and Cropping Systems

In pastures, Thiss-Off targets a broad range of thistle species. These include saffron, spear, variegated, artichoke, nodding, slender, soldier, and scotch/cotton thistles. Registered rates range from 460 mL to 2.7 L per hectare, depending on species and state. As a result, producers can address multiple thistle species with one product in a single pass. Thiss-Off also controls capeweed, Paterson’s curse, dandelion, docks, field bindweed, fat hen, Bathurst burr, and noogoora burr.

In cereals, Thiss-Off works in wheat, barley, oats, and triticale within state-specific growth windows. Generally, growers apply it from the 5-leaf stage through to late tillering. Furthermore, Thiss-Off supports tank mixing with diuron, clopyralid, bromoxynil, dicamba, metsulfuron-methyl, and diflufenican. This lets growers broaden the weed spectrum in a single operation.

Registered Across Multiple Crops and Situations

Beyond cereals and pastures, Thiss-Off holds registration in several other situations. In Queensland, it controls broadleaf weeds in sugar cane as a directed inter-row spray. In Tasmania, it targets spear thistle in oilseed poppies via aerial application. In New South Wales, it applies to rice by aircraft during the early tillering stage. For turf, Thiss-Off applies to established turf at rates from 330 mL to 1.8 L per hectare. Buffalo grass requires extra care due to its higher susceptibility to MCPA.

Frequently Asked Questions

Can I use Weed Force Thiss-Off in wheat during tillering?

Yes. In most states, Thiss-Off applies from the 5-leaf stage through to late tillering. State-specific windows apply — for example, in WA the window extends from the 5-leaf stage to flag leaf emergence (Zadoks 15–37). Refer to the Directions for Use table for your state and ensure weeds are at the correct growth stage before application.

How long before stock can graze after spraying pastures?

The withholding period for cereals and pastures is 7 days. Do not graze or cut for stock for 7 days after application. In WA pastures, observe at least 7 days after spraying before reintroducing stock.

Can Thiss-Off be applied by aircraft?

Yes. Aerial application is registered at 10–90 litres of water per hectare. Oilseed poppies in Tasmania are registered specifically for aerial application at 30–40 L/ha.

Does Thiss-Off control skeleton weed?

Yes, in South Australia. Thiss-Off controls skeleton weed at 960 mL–1.35 L per hectare, applied to rosettes from 5–15 cm diameter when the crop is between the 5-leaf and late tillering growth stages. This treatment substantially reduces seed set in the following season.

Is Thiss-Off safe to use near legumes?

Use with care. MCPA is preferred over 2,4-D amine or ester where legumes are undersown, but damage can still occur depending on species, variety, and growing conditions. Do not spray cereal crops undersown with lucerne. In pastures with clover present, do not exceed 575 mL/ha in Soldier Thistle situations in SA.

Farm Chemical Herbicide Range

Features & Benefits

750 g/L MCPA as the dimethylamine salt — a high-concentration soluble liquid formulation that mixes readily with water for consistent spray tank preparation.
Group 4 phenoxy herbicide — selectively controls susceptible broadleaf species while leaving established grass species unaffected, protecting pasture and crop grass stands.
Broad crop and situation registration — registered for use in wheat, barley, oats, triticale, linseed, rice (NSW), sugar cane (Qld), oilseed poppies (Tas), field peas, flax, grass-based pastures, grass seed crops, turf, and non-crop/fallow/industrial areas.
Multi-species thistle control — targets saffron, spear, variegated, artichoke, nodding, slender, soldier, and scotch/cotton thistles in a single product.
Flexible application methods — registered for boom spray (30–120 L/ha), aerial application (10–90 L/ha), and knapsack spot spraying, covering broadacre and small-scale operations.
Multiple registered tank mix partners — compatible with clopyralid, metsulfuron-methyl, diuron, dicamba, bromoxynil, and diflufenican to broaden weed spectrum control.
Low harvest withholding period — harvest WHP not required for cereals when used as directed; 7-day grazing/cutting WHP for cereals and pastures.
Registered in all Australian states — state-specific rate tables and critical comments cover NSW, ACT, Qld, Vic, SA, WA, and Tas.
Available in 5L and 20L — pack sizes suited to small landholders and broadacre producers alike.

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Directions Of Use

Click here for Weed Force Thiss-Off Thistle & Broadleaf Herbicide directions for use.

Thiss-Off applies by boom spray at 30–120 litres of water per hectare, by aerial application at 10–90 litres per hectare. Thiss-Off also supports spot spraying via knapsack at 13–27 mL per 10 litres of water, making it practical for mixed small-property and turf use. Rates and application timing vary by state, crop, and weed species — refer to the Directions for Use table and the state-specific Critical Comments before mixing. To prepare the spray, half-fill the tank with clean water, add the required amount of product, agitate thoroughly, then add the remaining water.

Rates are a general guide only. Before opening, carefully read Weed Force Thiss-Off Thistle & Broadleaf Herbicide directions for use, precautionary and protection statements, storage and disposal, safety directions and first aid instructions. The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal and dangerous, and render the product ineffective.

Questions and answers from customers

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Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Host & Pest

Host	Pest
Host & Pest
Barley, Wheat	Amsinckia, Yellow Burrweed Or Burr Grass, Artichoke, Artichoke Thistle, Ball Mustard, Bathurst Burr, Black Bindweed, Californian Burr, Cape Tulip, Capeweed, Carrot Weed, Cat's Ear Or Flatweed, Charlock, Common Iceplant, Corn Gromwell, Ironweed Or Sheepweed, Cutleaf Mignonette, Dandelion - Taraxacum Officinale, Deadnettle, Dock, Erodium Spp., Fat Hen, Fennel, Field Bindweed, Field Cress, Fumitory - Red, Hedge Or Wild Mustard, Hoary Cress Or Whiteweed, Horehound, Lesser Swinecress Or Bittercress, Lincoln Weed, Sand Rocket Or Mustard, London Rocket, Lupins, Melilotus Or Hexham Scent, Mintweed, Mustard, Nodding Thistle, Noogoora Burr, Opium Poppy, Paterson's Curse, Pimpernels, Plantain, Rough Poppy, Safflower, Saffron Thistle, Scotch Thistle, Shepherd's Purse, Skeleton Weed, Slender, Shore Or Sheep Thistle, Soldier Thistle, Sorrel, Spear Or Black Thistle, Star Thistle, Stinkwort, Sunflower - Seedling, Three Cornered Jack Or Doublegee, Turnip Weed, Variegated Thistle, Volunteer Canola Or Rapeseed, Ward's Weed, Wild Radish Or Radish Weed, Wild Turnip
Cereal Rye	Amsinckia, Yellow Burrweed Or Burr Grass, Capeweed, Charlock, Common Iceplant, Corn Gromwell, Ironweed Or Sheepweed, Deadnettle, Erodium Spp., Mustard, Pimpernels, Three Cornered Jack Or Doublegee, Turnip Weed, Ward's Weed, Wild Radish Or Radish Weed, Wild Turnip
Commercial/industrial Premises, Fallow Land, Flax, Grass Seed Crop, Linseed Crop, Non-Crop Area - General, Oats, Rights Of Way, Subterranean Clover Seed Crop, Turf	Artichoke, Artichoke Thistle, Ball Mustard, Bathurst Burr, Black Bindweed, Californian Burr, Cape Tulip, Capeweed, Carrot Weed, Cat's Ear Or Flatweed, Charlock, Cutleaf Mignonette, Dandelion - Taraxacum Officinale, Deadnettle, Dock, Fat Hen, Fennel, Field Bindweed, Field Cress, Fumitory - Red, Hedge Or Wild Mustard, Hoary Cress Or Whiteweed, Horehound, Lesser Swinecress Or Bittercress, Lincoln Weed, Sand Rocket Or Mustard, London Rocket, Lupins, Melilotus Or Hexham Scent, Mintweed, Mustard, Nodding Thistle, Noogoora Burr, Opium Poppy, Paterson's Curse, Pimpernels, Plantain, Rough Poppy, Safflower, Saffron Thistle, Scotch Thistle, Shepherd's Purse, Skeleton Weed, Slender, Shore Or Sheep Thistle, Soldier Thistle, Sorrel, Spear Or Black Thistle, Star Thistle, Stinkwort, Sunflower - Seedling, Turnip Weed, Variegated Thistle, Volunteer Canola Or Rapeseed, Wild Radish Or Radish Weed, Wild Turnip
Field Pea	Charlock, Prickly Lettuce
Grass Pasture	Artichoke, Artichoke Thistle, Ball Mustard, Bathurst Burr, Black Bindweed, Californian Burr, Cape Tulip, Capeweed, Carrot Weed, Cat's Ear Or Flatweed, Charlock, Cutleaf Mignonette, Dandelion - Taraxacum Officinale, Deadnettle, Dock, Fat Hen, Fennel, Field Bindweed, Field Cress, Fumitory - Red, Hedge Or Wild Mustard, Hoary Cress Or Whiteweed, Horehound, Horehound - Established, Horehound - Seedling, Lesser Swinecress Or Bittercress, Lincoln Weed, Sand Rocket Or Mustard, London Rocket, Lupins, Melilotus Or Hexham Scent, Mintweed, Mustard, Nodding Thistle, Noogoora Burr, Opium Poppy, Paterson's Curse, Pimpernels, Plantain, Rough Poppy, Safflower, Saffron Thistle, Scotch Thistle, Shepherd's Purse, Skeleton Weed, Slender, Shore Or Sheep Thistle, Soldier Thistle, Sorrel, Spear Or Black Thistle, Star Thistle, Stinkwort, Sunflower - Seedling, Turnip Weed, Variegated Thistle, Volunteer Canola Or Rapeseed, Wild Radish Or Radish Weed, Wild Turnip
Pasture Spray/graze	Annual Thistle, Artichoke, Artichoke Thistle, Ball Mustard, Bathurst Burr, Black Bindweed, Californian Burr, Caltrop Or Yellow Vine, Cape Tulip, Capeweed, Carrot Weed, Cat's Ear Or Flatweed, Charlock, Cutleaf Mignonette, Dandelion - Taraxacum Officinale, Deadnettle, Dock, Dock - Seedling, Erodium Spp., Fat Hen, Fennel, Field Bindweed, Field Cress, Fumitory - Red, Geranium, Hedge Or Wild Mustard, Hoary Cress Or Whiteweed, Horehound, Lesser Swinecress Or Bittercress, Lincoln Weed, Sand Rocket Or Mustard, London Rocket, Lupins, Melilotus Or Hexham Scent, Mintweed, Mustard, Nodding Thistle, Noogoora Burr, Opium Poppy, Paterson's Curse, Pimpernels, Plantain, Rough Poppy, Safflower, Saffron Thistle, Scotch Thistle, Shepherd's Purse, Skeleton Weed, Slender, Shore Or Sheep Thistle, Soldier Thistle, Sorrel, Spear Or Black Thistle, Star Thistle, Stinkwort, Sunflower - Seedling, Three Cornered Jack Or Doublegee, Turnip Weed, Variegated Thistle, Volunteer Canola Or Rapeseed, Wild Radish Or Radish Weed, Wild Turnip
Poppy	Fat Hen, Spear Or Black Thistle
Rice	Budda Or Butter Pea, Dirty Dora Or Variable Flat Sedge, Sedge, Starfruit
Sugar Cane	Bellvine, Billygoat Weed Or Blue Top, Bindweed, Chinese Burr, Fat Hen, Flannel Weed - Sida Cordifolia, Gambia Pea, Merremia Vine, Morning Glory - Ipomoea Spp., Noogoora Burr, Pink Convolvulus, Star Of Bethlehem Or Cupid's Flower, Streaked Rattlepod
Triticale	Amsinckia, Yellow Burrweed Or Burr Grass, Artichoke, Artichoke Thistle, Ball Mustard, Bathurst Burr, Black Bindweed, Californian Burr, Cape Tulip, Capeweed, Carrot Weed, Cat's Ear Or Flatweed, Charlock, Corn Gromwell, Ironweed Or Sheepweed, Cutleaf Mignonette, Dandelion - Taraxacum Officinale, Deadnettle, Dock, Erodium Spp., Fat Hen, Fennel, Field Bindweed, Field Cress, Fumitory - Red, Hedge Or Wild Mustard, Hoary Cress Or Whiteweed, Horehound, Lesser Swinecress Or Bittercress, Lincoln Weed, Sand Rocket Or Mustard, London Rocket, Lupins, Melilotus Or Hexham Scent, Mintweed, Mustard, Nodding Thistle, Noogoora Burr, Opium Poppy, Paterson's Curse, Pimpernels, Plantain, Rough Poppy, Safflower, Saffron Thistle, Scotch Thistle, Shepherd's Purse, Skeleton Weed, Slender, Shore Or Sheep Thistle, Soldier Thistle, Sorrel, Spear Or Black Thistle, Star Thistle, Stinkwort, Sunflower - Seedling, Three Cornered Jack Or Doublegee, Turnip Weed, Variegated Thistle, Volunteer Canola Or Rapeseed, Ward's Weed, Wild Radish Or Radish Weed, Wild Turnip

Tips For Use

Restraints

Do not apply if crops or weeds are stressed due to dry or excessively moist conditions.
Do not apply if rain is likely within 6 hours of application.
Do not spray crops or weeds outside the growth stages specified in the Critical Comments for your state.
Do not spray in high winds or under weather conditions that may cause drift onto susceptible plants.

Crop Safety and Susceptible Plants

Avoid spray drift onto susceptible crops, including cotton, vines, tomatoes, vegetables, fruit trees, legume crops, oilseed crops, and susceptible trees such as kurrajongs, belahs, and eucalypts.
Do not apply to non-crop land in a manner that risks contamination of susceptible crops in adjacent areas.

Mixing Instructions

Half-fill the spray tank with clean water. Add the required amount of Thiss-Off. Agitate thoroughly before adding the remaining water.
WeedForce recommends adding a non-ionic wetting agent to the spray solution to improve droplet spreading and penetration on broadleaf weed targets.
Do not mix with strong acids — adding acids will precipitate solid MCPA, deactivating the product and potentially blocking spray equipment.
Do not mix with strong alkalis — this releases dimethylamine vapour, which is toxic.
When tank mixing with Imidan, Le Mat (omethoate 290 g/L), or Dimethoate, include LI-700 to prevent alkaline hydrolysis reducing herbicide effectiveness.

Legume Tolerance

Thiss-Off is preferred over 2,4-D amine or ester where legumes are undersown, but tolerance varies with legume species, variety, and growing conditions.
Do not spray cereal crops undersown with lucerne.
In SA Soldier Thistle situations where clover is present, do not exceed 575 mL/ha.

Protection of Livestock

Do not graze or cut for stock for 7 days after application to cereals and pastures.
Capeweed, Paterson’s Curse, and Variegated Thistle may be poisonous to stock after spraying. Avoid introducing stock to treated areas until the withholding period has passed.
Under spray/graze programmes (NSW, ACT, Vic), introduce stock 7–10 days after spraying at stocking rates at least 5 times heavier than normal, preferably sheep. Cattle are less effective grazers in this situation.
Do not graze horses or pigs on Paterson’s Curse after spraying.

Protection of Wildlife, Fish, Crustaceans and the Environment

Do not contaminate dams, rivers, or streams with the product or used containers.
This product is very toxic to aquatic organisms with long-lasting effects. Keep away from water bodies during application.

Storage

Store in the original, closed container in a dry, cool, well-ventilated area, out of direct sunlight.
Keep away from strong acids, strong bases, and strong oxidising agents.

Safety Directions

Harmful if swallowed. Attacks eyes. Will irritate the skin.
When opening the container, preparing the spray, and applying, wear cotton overalls buttoned to the neck and wrist, a washable hat, elbow-length PVC gloves, and goggles.
If the product contacts skin, immediately wash the area with soap and water. If product or spray contacts eyes, wash out immediately with water.
After use and before eating, drinking, or smoking, wash hands, arms, and face thoroughly with soap and water.

Equipment Decontamination

After use, clean all spray equipment with 2% cloudy ammonia solution, followed by several clear water rinses, before using the equipment on plants sensitive to herbicides.

First Aid

If poisoning occurs, contact a doctor or the Poisons Information Centre. Phone Australia 131 126.
For further information, refer to the Safety Data Sheet (SDS).

This information and product advice are not intended as advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Withholding Period

Withholding Period Details (WHP)

Cereals and Pasture: Do not graze or cut for stock for 7 days after application.

Harvest Withholding Period (Cereals): Not required when used as directed.

Oilseed Poppies (Tasmania): Do not harvest for 5 weeks after application.

Re-entry Period: Do not perform hand weeding for 7 days after application unless workers wear cotton overalls buttoned to the neck and wrist (or equivalent clothing), chemical-resistant gloves, and footwear.

SDS & Technical

Weed Force Thiss-Off Thistle & Broadleaf Herbicide Label (APVMA)	Download Pdf
Weed Force Thiss-Off Thistle & Broadleaf Herbicide Label	Download Pdf
Weed Force Thiss-Off Thistle & Broadleaf Herbicide SDS	Download Pdf