Atraquest 900 WG Herbicide (Atrazine)

Atraquest 900 WG Herbicide is a high-concentration Group C herbicide containing 900 g/kg atrazine in a water-dispersible granule formulation, developed by Conquest Crop Protection Pty Ltd for pre-emergence and post-emergence annual weed control in a broad range of broadacre crops.

It targets annual grass and broadleaf weeds through inhibition of photosynthesis at photosystem II, and suits both dryland and irrigated systems across multiple crop types, including sorghum, maize, sweetcorn, sugarcane, broom millet, saccaline, TT canola, and plantation forestry. The WG formulation disperses cleanly in the spray tank and is compatible with glyphosate, ametryn, dicamba, Dual Gold, and other listed products, supporting flexible integrated weed management programmes.

Pack Sizes: 15 kg. Registrant: Conquest Crop Protection Pty Ltd (APVMA #: 56276)

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Description

Atraquest 900 WG Herbicide is a Group C (Group 5) pre-emergence and post-emergence herbicide containing 900 g/kg atrazine in a water-dispersible granule formulation, registered for broad-spectrum annual weed control in sorghum, maize, sweetcorn, sugarcane, TT canola, and a range of other listed crops. Registered by Conquest Crop Protection Pty Ltd, it targets annual grass and broadleaf weed species by inhibiting photosynthesis at photosystem II, preventing susceptible weeds from germinating or establishing during critical early crop growth stages.

Atraquest 900 WG suits pre-plant, pre-emergence, and post-emergence application, giving growers genuine timing flexibility across both dryland and irrigated systems. Furthermore, the water-dispersible granule formulation disperses quickly and cleanly in the spray tank with vigorous agitation, reducing dust exposure compared to wettable powder alternatives. As a result, it integrates efficiently into existing farm spray programmes and pairs with a wide range of herbicide tank mix partners.

Atrazine 900 WG Annual Weed Control: Application at a Glance

Application Timing	Method	Key Situations
Pre-plant	Boom or aerial spray to bare moist soil	Sorghum, Maize, TT Canola
Pre-emergence	At or immediately after sowing	Sorghum, Sweetcorn, Broom Millet, Saccaline
Post-emergence	Seedling weeds up to 1 cm high	Sorghum, Maize, Sugarcane, TT Canola

Weeds Controlled (Key Species)

Amaranths, Barnyard Grass, Crowsfoot Grass, Pigeon Grass
Parthenium Weed, Bladder Ketmia, Common Thornapple
Blackberry Nightshade, Cobbler’s Pegs, Mintweed
Fat-hen, Wireweed, Sesbania Pea, Yellow Vine, Love Grass
Pigweed, Potato Weed, Prickly Paddy Melon, Sunflowers

Note: Established perennial species, large annuals, and large broadleaf weeds are not satisfactorily controlled at registered rates.

Frequently Asked Questions

Q: What is Atraquest 900 WG Herbicide used for?

A: Specifically, it controls a broad range of annual grass and broadleaf weeds in listed broadacre crops, including sorghum, maize, sweetcorn, sugarcane, TT canola, plantation forestry, and roadside situations. For the full crop and species list, refer to the Directions for Use table.

Q: Can Atraquest 900 WG be used post-emergence?

A: Yes. Apply post-emergence to seedling weeds no more than 1 cm high when the soil is moist, and rain or irrigation will follow. Additionally, add a non-ionic surfactant for post-emergence applications in sorghum, broom millet, and saccaline.

Q: What is the maximum atrazine application rate per year?

A: The maximum rate is the equivalent of 3 kg active ingredient atrazine per hectare per year in all crops except plantation forestry. Consequently, do not exceed this limit when combining pre- and post-emergence applications in the same season.

Q: Does Atraquest 900 WG require rainfall after application?

A: Yes. Ensure sufficient rain or irrigation thoroughly wets the soil through the weed root zone within 10 days of application. Delay in activation may result in reduced weed control.

Q: Is Atraquest 900 WG compatible with other herbicides?

A: Yes. It is compatible with glyphosate, ametryn, dicamba, Dual Gold, hexazinone, Conquest Explode 250, and Conquest Scorcher 250, among others. Always test mixtures prior to mixing commercial quantities, as water quality varies by location.

Crop Protection Herbicide Range

Features & Benefits

900 g/kg atrazine concentration in WG formulation: High active loading delivers precise, consistent dosing per hectare and disperses cleanly in the spray tank with vigorous agitation, reducing handling risks compared to liquid alternatives.
Pre-plant, pre-emergence, and post-emergence flexibility: Three timing options give growers genuine programme flexibility across both dryland and irrigated broadacre systems, without locking in a single application window.
Broad-spectrum annual weed control: Controls key grass and broadleaf species, including Parthenium Weed, Barnyard Grass, Crowsfoot Grass, Amaranths, Bladder Ketmia, Mintweed, Cobbler’s Pegs, and Wireweed across multiple crop types.
Wide crop registration: Registered for use in sorghum, maize, sweetcorn, sugarcane, TT canola, grass seed crops, Eucalypt and Pinus radiata plantations, lucerne, grass pastures, and roadside/rights of way situations.
Residual soil activity: Provides extended residual weed control once activated by rainfall or irrigation, helping to suppress weed pressure through early crop establishment.
Group C mode of action: Photosystem II inhibition provides a distinct chemistry option for resistance management programmes, rotating away from other herbicide groups.
Wide tank mix compatibility: Compatible with glyphosate, ametryn, dicamba, Dual Gold, hexazinone, Conquest Explode 250, and Conquest Scorcher 250, supporting integrated weed management across diverse paddock situations.
Registered by Conquest Crop Protection: Developed and registered by Conquest Crop Protection Pty Ltd, a specialist Australian crop protection company with a strong broadacre herbicide portfolio.

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Rated 5 out of 5
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September 10, 2025

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Directions Of Use

Click here for Atraquest 900 WG Herbicide directions for use.

Atraquest 900 WG Herbicide is mixed with clean water and applied through boom or aerial spray equipment at rates ranging from 270 g/ha to 8.8 kg/ha, depending on crop, soil type, weed spectrum, and application timing. For pre-plant and pre-emergence applications, fill the spray vat to no more than 25% full with clean water, then add the required amount of Atraquest 900 WG steadily with vigorous agitation. Maintain agitation throughout the entire mixing and spraying operation. For post-emergence applications, target weeds at the seedling stage, no more than 1 cm high, when the soil is moist and follow-up rain or irrigation is expected. Add a non-ionic surfactant for post-emergence applications in sorghum, broom millet, and saccaline; add 5.5 L/ha crop oil for maize and sweetcorn. Do not leave spray solution standing in the vat overnight. Aerial application requires 20 to 30 L/ha; ground application requires 50 to 100 L/ha with a minimum band width of 30 cm.

General Rates:

Canola (Triazine Tolerant varieties only) Pre-emergence or post sowing pre-emergence only – 1.1 to 2.2kg per Ha
Canola (Triazine Tolerant varieties only) Post-emergence – 0.5 to 1.1kg per Ha
Eucalypts, Pinus Radiata plantations – 5 to 8.8kg per Ha
Grass Pastures – 2.2 to 3.3kg per Ha
Grass Seed Crops – established stands of Currie Cocksfoot, Demeter Fescue and Sirocco Phalaris. – Seedling Panicum Maximum and Signal grass – 1 to 3.3kg per Ha
Lucerne established for more than 1 year – 600g per Ha
Lupins when no weeds are present at sowing – 270 to 550g per Ha plus 280 to 550g per Ha Simaquest 900 WG Herbicide.
Maintenance of fallow areas prior to planting a Sorghum crop in a conservation tillage system – 2.0 to 3.3kg per Ha
Maize, Sweetcorn Irrigated and Dryland) – Maize, Sweetcorn Irrigated and Dryland) – 2.5 to 3.3kg per Ha
Potatoes – 1.3 kg plus 4.6 L of a 250 g/L amitrole with 220 g/L ammonium thiocyanate pe Ha
Roadside and rights of way – 3.3kg per Ha
Sorghum Concep II treated seed – 1.4 kg plus 1 to 2 L Dual Gold Herbicide per Ha
Sorghum dryland and irrigated – 1.1 kg plus 500 mL of a 500 g/L 2,4-D amine or 700 mL of a 200 g/L dicamba per Ha
Sorghum, Forage Sorghum, Broom Millet, Saccaline Dryland & Irrigated – 1.3kg to 3.3kg per Ha.
Sugar Cane – 2.2 to 3.3kg per Ha

Rates are a general guide only. Before opening, carefully read Atraquest 900 WG 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

When targeting Cobbler Pegs in grass pastures (QLD), what is the mixing rates for boom sprayer application per hectare for preemergent control?

Q When targeting Cobbler Pegs in grass pastures (QLD), what is the mixing rates for boom sprayer ap...... Read more
Asked by bealnick on April 17, 2024 7:36 pm

Answered by the admin
Atrazine 900 WG Herbicide is not registered to control Cobbler's Peg as a pre-emergent in pasture situations. Hence, there is no boom spray rate available. Further clarification can be sought from the manufacturer (Conquest Crop Protection) on 0893470500 or https://conquestag.com.au/contact-us/

Answered by the admin
Atrazine 900 WG Herbicide is not registered to control Cobbler's Peg as a pre-emergent in pasture situations. Hence, there is no boom spray rate available. Further clarification can be sought from the manufacturer (Conquest Crop Protection) on 0893470500 or https://conquestag.com.au/contact-us/

Has there been success using Atraquest 900 WG Herbicide to kill GRT (Giants Rat's Tail) in a forage sorghum crop?

Q Has there been success using Atraquest 900 WG Herbicide to kill GRT (Giants Rat's Tail) in a fora...... Read more
Asked by Wade on April 30, 2023 4:41 pm

Answered by the admin
Atraquest 900 WG Herbicide is not registered to control Giant Rat's Tail Grass (GRT). When applied to the soil, atrazine is absorbed by the roots of the target plants, which disrupts the photosynthesis process, ultimately leading to their death. Control over some perennial grasses can be achieved with atrazine, and it's important to note that the effectiveness of atrazine on perennial grasses can depend on several factors, such as the timing and method of application, the dosage, and the age and growth stage of the target plants. We are unaware of off-label trials of Atrazine on GRT.

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
Broom Millet - Dryland, Dryland Forage Sorghum, Dryland Saccaline & Sorghum - Dryland	Amaranth Or Amaranthus, Barnyard Or Water Grass, Blackberry Nightshade, Bladder Ketmia, Burr, Caltrop Or Yellow Vine, Common Thornapple, Crowsfoot Grass, Dwarf Marigold, Fat Hen, Giant Or Black Pigweed, Ground Or Annual Ground Cherry, Lovegrass, Mintweed, Paddy Melon, Parthenium Weed, Pigeon Grass, Pigweed Spp., Plains Grass, Potato Or Yellow Weed, Spring Or Early-spring Grass, Summer Grass, Wireweed, Knotweed Or Hogweed
Broom Millet - Irrigated, Irrigated Forage Sorghum, Irrigated Saccaline & Sorghum - Irrigated	Amaranth Or Amaranthus, Barnyard Or Water Grass, Black Bindweed, Blackberry Nightshade, Bladder Ketmia, Burr, Caltrop Or Yellow Vine, Cobbler's Pegs, Common Thornapple, Crowsfoot Grass, Dwarf Marigold, Fat Hen, Giant Or Black Pigweed, Ground Or Annual Ground Cherry, Lovegrass, Mintweed, Paddy Melon, Parthenium Weed, Pigeon Grass, Pigweed Spp., Plains Grass, Potato Or Yellow Weed, Sesbania Pea, Spring Or Early-spring Grass, Summer Grass, Sunflower, Wild Oat, Wireweed, Knotweed Or Hogweed
Canola - Tt Only - Post Sowing & Pre Emergent	Annual Ryegrass - Suppression, Barley Grass - Suppression, Brome Grass - Suppression, Capeweed, Charlock, Clover, Corn Gromwell, Ironweed Or Sheepweed, Fumitory, Geranium, Ivy Leaf Speedwell, London Rocket, Mustard, Paterson's Curse, Shepherd's Purse, Silver Grass Or Rat's-tail Fescue, Three Cornered Jack Or Doublegee, Turnip, Wild Oat - Suppression, Wild Radish - Suppression
Canola-triazine Tolerant Only-post Emergent	Annual Ryegrass, Mustard, Turnip, Wild Radish Or Radish Weed
Currie Cocksfoot Seed Crop-over 1 Year Old & Demeter Fescue Seed Crop Over 1 Year Old	Billygoat Weed Or Blue Top, Brome Grass, Cobbler's Pegs, Crowsfoot Grass, Feathertop Rhodes Grass, Fleabane, Lovegrass, Mexican Or Prickly Poppy, Pigeon Grass, Rhodes Grass, Sida, Stinking Roger, Thickhead, Wild Hops, Wild Radish Or Radish Weed
Dryland Sweetcorn, Irrigated Sweet Corn, Maize - Dryland & Maize - Irrigated	Amaranth Or Amaranthus, Barnyard Or Water Grass, Blackberry Nightshade, Bladder Ketmia, Burr, Caltrop Or Yellow Vine, Common Thornapple, Crowsfoot Grass, Dwarf Marigold, Fat Hen, Ground Or Annual Ground Cherry, Lovegrass, Mintweed, Paddy Melon, Parthenium Weed, Pigeon Grass, Pigweed Spp., Plains Grass, Potato Or Yellow Weed, Spring Or Early-spring Grass, Summer Grass, Wireweed, Knotweed Or Hogweed
Eucalyptus Plantation & Pinus Plantation - Pinus Radiata	Mouse-ear Chickweed, Sand Brome, Silvergrass - Vulpia Spp., Sow Or Milk Thistle, Wild Oat, Yorkshire Fog Grass
Guinea Grass Seed Crop - Seedling, Seedling Signal Grass Seed Crop & Sirocco Phalaris Seed Crop - Established	Billygoat Weed Or Blue Top, Brome Grass, Cobbler's Pegs, Crowsfoot Grass, Feathertop Rhodes Grass, Fleabane, Lovegrass, Mexican Or Prickly Poppy, Pigeon Grass, Rhodes Grass, Sida, Stinking Roger, Thickhead, Wild Hops, Wild Radish Or Radish Weed
Lucerne Over 1 Year Old	Mintweed
Rights Of Way & Roadside Weed Control	Parthenium Weed
Sorghum-pre-plant.soil Tmt-cons.til.syst	Amaranth Or Amaranthus, Barnyard Or Water Grass, Black Bindweed, Blackberry Nightshade, Bladder Ketmia, Burr, Caltrop Or Yellow Vine, Cobbler's Pegs, Common Thornapple, Crowsfoot Grass, Dwarf Marigold, Fat Hen, Ground Or Annual Ground Cherry, Lovegrass, Mintweed, Paddy Melon, Parthenium Weed, Pigeon Grass, Pigweed Spp., Plains Grass, Potato Or Yellow Weed, Sesbania Pea, Spring Or Early-spring Grass, Summer Grass, Wireweed, Knotweed Or Hogweed
Sugar Cane	African Star Grass, Barnyard Or Water Grass, Bellvine, Billygoat Weed Or Blue Top, Blue Top - Ageratum/heliotropium Spp., Budda Or Butter Pea, Chinese Burr, Crowsfoot Grass, Flannel Weed - Abutilon Oxycarpum, Gambia Pea, Green Summer Grass, Mimosa Invisa, Mossman River Or Burr Grass, Rattlepod, Sida Retusa, Star Of Bethlehem Or Cupid's Flower, Stinking Passion Flower Or Vine, Summer Grass, Summer Or Crab Grass, Sweet Briar Or Wild Rose

Tips For Use

Restraints:

Do not apply to waterlogged soil.
Do not apply if heavy rains or storms likely to cause surface runoff are forecast within two days of application.
Do not irrigate to the point of runoff for at least two days after application.
Do not apply to any drainage line. Do not apply to areas susceptible to runoff where drainage results in rapid entry into waterways.
Do not use a knapsack sprayer for applications in Eucalypt and Pinus radiata plantations.
Do not apply to TT canola by aircraft. Apply only with a low boom sprayer with a 60 m buffer zone downwind of treated fields to natural or impounded lakes or dams, and a 20 m buffer zone for any well, sinkhole, or intermittent or perennial stream.
Do not enter treated areas without protective clothing until the spray has dried.

Soil Moisture:

This product requires rainfall or irrigation to move it down through the soil into the weed root zone to become effective.
Sufficient rain or irrigation to thoroughly wet the soil through the weed root zone must occur or be applied within 10 days of spraying.

Mixing Instructions:

Fill the vat no more than 25% full with clean water before adding Atraquest 900 WG.
Begin vigorous agitation before adding the product. Maintain agitation throughout mixing and spraying.
Add the required amount of Atraquest 900 WG steadily, not all at once. Allow vigorous bypass agitation to fully disperse the product before continuing to fill the vat.
Do not leave the spray solution standing in the vat overnight.

Compatibility:

Compatible with Adigor, ametryn, dicamba, Dual Gold, Gesapax Combi 500 SC, glyphosate, Conquest Explode 250, Hasten, hexazinone, and Conquest Scorcher 250.
Test all mixtures on a small scale before mixing commercial quantities, as water quality varies by location and other manufacturer formulations are beyond Conquest’s control.

Resistance Management:

Atraquest 900 WG is a Group C herbicide. Resistant weed biotypes may exist through natural genetic variability.
Do not use Group C herbicides in consecutive years.
Do not apply atrazine if the area received a triazine herbicide in the previous season.
The maximum rate is 3 kg active ingredient atrazine per hectare per year in all crops except plantation forestry. Do not exceed this limit.
Report any suspected resistance to Conquest Crop Protection Pty Ltd at (+61) 8 9347 0500 or [email protected].

Crop Rotation:

Do not plant crops other than those listed on the label for at least 6 months after applications up to 1.4 kg/ha, or for 18 months after applications of 1.4 to 3.3 kg/ha.

Protection of Crops, Native and Other Non-Target Plants:

Do not apply under weather conditions or from equipment that may cause spray drift onto nearby susceptible plants, crops, or pastures.
Do not apply the product, or drain or flush equipment, near desirable trees or plants, or in locations where the chemical may be washed into contact with their roots.

Protection of Wildlife, Fish, Crustaceans and the Environment:

Do not apply within 60 m of natural or impounded lakes or dams.
Do not use in channels or drains.
Do not contaminate streams, rivers, or waterways with the chemical or used containers. This product is very highly toxic to algae and aquatic macrophytes.

Storage and Disposal:

Store in the closed original container in a dry, cool, well-ventilated area out of direct sunlight.
This product is a Scheduled Poison. Observe all relevant regulations regarding sale, transport, and storage.
Shake bag contents into the spray tank until the bag is empty. Do not dispose of undiluted chemicals on-site.
Puncture and bury empty containers in a local authority landfill. If no landfill is available, bury the container below 500 mm in a marked disposal pit, clear of waterways, desirable vegetation, and tree roots. Do not burn empty containers or product.

Safety Directions:

Avoid contact with eyes and skin. Do not inhale dust or spray mist.
When preparing and applying the spray, wear cotton overalls buttoned to the neck and wrist (or equivalent clothing), a washable hat, and elbow-length PVC gloves.
If using a hand-directed sprayer, additionally wear waterproof trousers and boots.
Wash hands, arms, and face thoroughly with soap and water after use and before eating, drinking, or smoking. Wash gloves and contaminated clothing after each day’s use.

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):

Harvest: Not required when used as directed (all crops).

Grazing:

TT Canola (pre-emergence application): Do not graze or cut for stock food for 15 weeks after application.
TT Canola (post-emergence application): Do not graze or cut for stock food for 6 weeks after application.
Other crops: Not required when used as directed.
Other crops (except canola): Do not apply to areas that will or may be grazed or cut for stock food within 28 days after application.