Grazon Extra

1 Trade nameManufacturerForm



3 ACTIVE INGREDIENTS: Aminopyralid 8g/L+picloram 100g/L+tricolpyr 300g/L



2,4-D amine 5002,4-D Amine 500g/L
2,4-D amine 6252,4-D Amine 625g/L
2,4-D amine plus Dicamba2,4-D 250gL + dicamba 100g/L
2,4-D ester 8002,4-D Ester 800g/L
2,4-D ester plus Garlon2,4-D ester 530g/L + triclopyr 200g/L
2,4-D LV ester 6002,4-D LV ester 600g/L
2,4-DB 4002,4-DB 400g/L
2,4-DB plus MCPA2,4-DB 200g/L + MCPA 250g/L
AccessPicloram 120g/L + triclopyr 240g/L
Dicamba 200Dicamba 200
Dicamba 25 plus MCPA 150Dicamba 25g/L + MCPA 150g/L
Dicamba 500Dicamba 500g/L
Dicamba 700Dicamba 700g/kg
Dicamba plus MCPADicamba 80g/L + MCPA 340g/L
Garlon 600Triclopyr 600g/L
Grazon ExtraAminopyralid 8g/L+picloram 100g/L+tricolpyr 300g/L
HotshotAminopyralid salt 10g/L + fluroxypyr-meptyl 140g/L
LontrelClopyralid 300g/L
Lontrel 750Clopyralid 750g/kg
MCPA amine 500MCPA 500g/L
MCPA LVEMCPA LV ester 500g/L
MCPB 400MCPB 400g/L
Picloram plus TriclopyrPicloram 100g/L + triclopyr 300g/L
Starane 200Fluroxypyr 200g/L
Tordon 242MCPA 420g/L + picloram 26g/L
Tordon 75-D2,4-D 300g/L + picloram 75g/L
Tri-kombi24D Ester 800g/L + Dicmaba 40g/L + Mecoprop 336g/L


A leaf and root absorbed, translocated, residual herbicide for the control of broad leaved and woody weeds in grasses.


Best results when plants are actively growing.

Apply to dry plants.

Don't apply by air when temperatures are more than 35 degrees C or wind more than 15 km/hr.

Maximum tank storage time - 1 week.


Rainfast in 1 hour.

Frost effects: Plants affected by frost are generally less susceptible to the herbicide.

Wind: Winds above 15 kph may lead to unacceptable drift. Winds below 3 kph may indicate inversion conditions which can lead to significant drift.

Inversions: Don't spray under inversion conditions.


Delta T and relative humidity: Avoid application when Delta T is greater than

Soil moisture at application:


Spray oils may improve weed control but may reduce selectivity on the crop.



Trace elements. Not compatible with many trace elements.

See HerbiGuide Compatibilities button.



If coarse droplets are being used then water rates around 200 L/ha are required. This is usually applied as 2 passes of 100 L/ha. Use of lower water volumes requires specialised set up to minimise drift. Contact HerbiGuide for more information.

Boom sprays:

Carrier volume: 30-400 L/ha

Nozzles: Flat fan.

Pressure: 150-400 kPa.

Blanket wipers:

Adjust flow rate to keep blanket wet but not dripping. Set as low as possible, so that the ground or susceptible understorey is not contacted. Ground speeds of 10-15 kph are common. A pass in one direction followed by a pass in the opposite direction often leads to improved control especially in heavy stands of weed or where contact is limited or the the weeds are not stiff.

Controlled Droplet Applicators (CDA):

Use a nozzle that delivers about 2 mL/sec. Use a slow (1 m/s) sweeping action to give a droplet density of 20 drops per square centimetre on the weed. Most operators use a marking dye.

Gas Gun:

Apply 50 mL shots to cover 5 m2 of weed and check that droplet density exceeds 20/cm2.

Hand lead high volume:

Ensure thorough coverage. Use water volumes around 1000 L/ha for low vegetation and upto 5000 L/ha for dense and tall vegetation. A number 6 to 8 tip is often used at a pressures of 300-600 kPa. (Pressures of 700-1500 kPa on the label is usually too high).

Knapsack sprayer:

Ensure thorough coverage. Use water volumes around 1-5 L of spray mix per 10 square metres.

Sprinkler Sprayer:

Apply with a slow sweeping motion over the weeds. Appy at low pressures of 50-200 kPa. Calibrate to ensure the correct rate of herbicide per hectare is being applied.


Clean Up:

Remove filters and clean separately. Rinse with soapy water (eg 500 mL or g of Drive, Dynamo, Omo or Surf per 100 L water) or water plus 0.25% wetting agent and run through boom. Rinse with water.


Remove filters and clean then soak in 500 mL household ammonia in 10 L water for 30 minutes.

Rinse sprayer with soapy water (eg 500 mL or g of Drive, Dynamo, Omo or Surf per 100 L water) or water plus 0.25% wetting agent and run through boom. Fill with 1% solution of ammonia and allow to stand for several hours. Triple rinse with water. Or use a commercial spray tank and equipment cleaner.

Rinse nozzles and filters in water and replace.

Don't use chlorine based cleaners.


Unlikely to occur under normal use patterns. However, there may be populations of weeds that have or will develop resistance.


Crop Rate  
 200 mL/ha 300 mL/ha400 mL/ha600 mL/ha
Wheat2 months2 months4 months4 months
Barley2 months2 months4 months4 months
Bean: Faba4 months4 months6 months6 months
Canola2 months4 months4 months4 months
Chickpea4 months6 months6 months6 months
Lucerne6 months9 months9 months9 months

Replanting intervals may be longer under drought conditions or where there are extended periods wher the soil is dry.

The label has an 18 month withholiding for broad leaved crops following blanket wiper application which seems excessiviely long.


AllGrazingNot required*

* Check export slaughter interval for stock or meat destined for export markets.

ESI 3 days. (Stock that have consumed feed that was sprayed in the previous 42 days should have 3 days on clean feed).

EGI 42 days.


Wear protective clothing if in contact with the crop before the spray has dried.


Cotton overalls, washable hat, elbow length neoprene gloves and face shield or goggles.

19 SOIL:

May leach on very sandy soils under high rainfall.

Soli pH has little effect on efficacy and breakdown.

Breaks down more quickly in high organic matter soils with high microbial activity.


Uptake and translocation:

Absorbed through roots, leaves, bark or from the cut stump.

Physiological effects:

Hormone herbicide with wide ranging effects. Disrupts plant cell growth.

Residual Life and Breakdown:


Broad leaf species are generally more sensitive than grass species.


Crop tolerance:

Most grasses are tolerant and most broad leaved species are sensitive.

Varietal sensitivities:

Effect on Clover Species:

Damages clover as a spray or as residual in the soil.

Effect on Medic Species:

Damages medic as a spray or as residual in the soil.

Effect on Lucerne:

Damages lucerne as a spray or as residual in the soil.

Effect on Native Plants:

High rates kill most broad leaved native plants. Low rates can be quite selective and useful in many situations.



Leaves usually turn red then wither within a few weeks of application then fall off.

Symptoms may take a week to a month to develop and in some species symptoms may only appear on the resumption of new growth.




Harmful if swallowed. Irritating to eyes and skin. Toxic to aquatic organisms.


Poison Schedule - S6

Mammalian toxicity - Low.

Acute oral LD50 - >2000 mg/kg (rats), [For comparison table salt is 3000 mg/kg]. Low toxicity if swallowed. Unlikely to be harmful unless large amounts are swallowed.

Skin - Acute dermal LD50 - > 2000 mg/kg (rabbit). Prolonged or repeated contact may cause moderate irritation or burn. Prolonged contact is not likely to result in absorption of harmful quantities.

Eye - May cause temporary, moderate eye irritation. May cause slight temporary corneal injury.

Vapour inhalation - LC50 - Low. Prolonged exposure is not likely to cause adverse effects. Excessive exposure to solvent inhalation may cause eye and respiratory irritation, headache, dizziness and narcotic effects.

Chronic oral toxicity NOEL (picloram) - 0.5-7 mg/kg/day for two years.

Not mutagenic or teratogenic (i.e. does not cause cancer or reproductive problems in animal tests). Triclopyr acid has caused effects on reproduction at doses that cause significant toxicity to parent animals.

Does not accumulate in the body.

Acceptable Daily Intake (ADI):

Other Species -

Birds - Aminopyralid is practically non toxic with an acute LD50 > 2000 mg/kg and a dietry LC50 >5000ppm.

Picloram is practically non toxic with an LD50 > 2000 mg/kg.

Triclopyr has slight to low toxicity. LD50 501-2000 mg/kg. It is practically non toxic on a dietry basis with an LC50 >5000 ppm.

Fish - Aminopyralid is slightly toxic to fish with LC50 and EC50 of 10-100 mg/L for sensitive species.

Picloram is moderately toxic.

LC50 = 1-10 mg/L for sensitive species.

Triclopyr butoxyethyl ester is toxic to fish and moderately toxic to other aquatic organisms. In soil and water it breaks down to triclopyr acid which has low toxicity.

LC50 = 0.1-1 mg/L is sensitive species.

Invertebrates - toxicity.

Bees - Aminopyralid, picloram and triclopyr have low toxicity. Aminopyralid, picloram and triclopyr butoxyethyl ester have an acute oral and contact LD50 >100 ug/bee.

Arthropods: toxicity.

Earthworms (Eisenia foetida): Aminopyralid LC50 >1000 mg/kg. Picloram LC50 > 5000 mg/kg. Practically non toxic.

Algae: Aminopyralid growth inhibition EC50 in green algae (Selenastrum capricornutum) = 32 mg/L. Triclopyr butoxyethyl ester growth inhibition EC50 2.27 mg/L for blue green algae (Ananbaena flos-aquae)

Duckweed (Lemma spp.): Aminopyralid growth inhibition EC50 > 88 mg/L. Triclopyr butoxyethyl ester growth inhibition EC50 = 2.2mg/L.

Diatoms : Aminopyralid growth inhibition EC50 =18-77 mg/L.

Triclopyr butoxyethyl ester growth inhibition EC50 0.193-1.17 mg/L.

Livestock: Triclopyr butoxyethyl ester is moderately toxic to livestock. In soil and water it breaks down to triclopyr acid which has low toxicity.

Triclopyr and picloram do not accumulate in animal systems.

Other Species:



Contact a doctor or Poisons Information Centre on 13 11 26.

If Swallowed - Contact a doctor immediately. Sip a glass of water if patient is able to swallow. Do not induce vomiting unless instructed by a doctor. Never give fluids or induce vomiting if the patient is unconscious or convulsing.

If on Skin - Wash skin thoroughly with soap and water.

If in Eyes - Flush with water for 15 minutes. See a doctor.

If Inhaled - Remove patient from contaminated area to fresh air. If patient is not breathing then give artificial respiration and call an ambulance.

Advice to Doctor

No specific antidote. Treat symptomatically with supportive care.


Picloram ester and triclopyr ester are rapidly converted to the parent acids in soil, water, plants and animals.

Picloram is more residual than aminopyralid which is more residual than triclopyr.

Aminopyralid in the air has a tropospheric half life of 6.426 days.

Aminopyralid is not readily biodegradable on OECD guidelines.

Picloram is broken down in soil by photo degradation and microbial action and has a half life in soil ranging from 167-513 days under aerobic conditions. Under anaerobic conditions the half life is >300 days. It normally remains in the top 30 cm of soil but may be found deeper on soils with poor adsorption properties.

Picloram has a half life in water of 1 to 40 days in water depending mainly on sunlight intensity. It is broken down in water by ultra violet radiation with a half life of 2.3-9.58 days. It is stable to hydrolysis at neutral to alkaline pH with a hydrolysis half life of >1.8 years. Theoretical Oxygen Demand (ThOD) is 0.99 p/p.

Picloram in the air has a tropospheric half life of 12.21 days.

Picloram is not readily biodegradable on OECD guidelines.

Triclopyr butoxyethyl ester is broken down in soil by photo decomposition and microbial action and has a half life in soil of 6-52 days under aerobic conditions. Minimal leaching may occur on light soils in high rainfall conditions.

Triclopyr butoxyethyl ester decomposes in water with a half life of less than 1 day. It has a photolysis half life in water of 6.6 days and a hydrolysis half life of 12 hours. OECD biodegradation after 28 days was 18%. Theoretical Oxygen Demand (ThOD) is 1.39 p/p.

Triclopyr butoxyethyl ester is not readily biodegradable on OECD guidelines.

It has an EPA classification for soil mobility that ranges from

Ground water contamination is possible.

It is stable in intact plants.

It can move in run-off water after heavy rainfall events as it dissolves in water rather than attaching to soil particles.

Replanting intervals - 12 months for most species to 4 years for some species. Accumulation in milk and tissues has not been found.


See HerbiGuide Species Solution tab.


See HerbiGuide Species Solution tab.


UN number: 3082

CAS numbers:

Hazchem code: 1X

NOHSC classification: Hazardous.

Land transport:

Dangerous goods class (ADG): Not classified as a dangerous good.

Sea transport:

Proper shipping name: ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (triclopyr BEE, picloram) Marine pollutant.

International Maritime Dangerous Goods Code (IMDG): Classified as a dangerous good.

Class: 9

Packaging group: III




Odour: Ester or hydrocarbon

Form: Liquid.

Chemical name:



Empirical formula:

Water solubility: Emulsifiable.

Oil solubility: Soluble? Not normally mixed with oils.

Octanol:Water ratio: Triclopyr BEE LogPow = 4.09-4.49. Picloram LogPow = 2.27 or 3-5. Aminopyralid LogPow = 0.72 or < 3.

Soil organic carbon absorption coefficient (Koc); Log Koc = 1.23 for picloram. Very high potential for mobility in the soil.

Bioconcentration Potential BCF = 100-3000 for triclopyr BEE, picloram acid and is moderate. BCF for fish for picloram I 31-135. BCF for aminopyralid is <100 or low

Vapour Pressure: Triclopyr BE 3.6 x 10-6 mm Hg at 25 C. Triclopyr butoxyethyl ester 1.0 x 10-5 mm Hg at 330C

Picloram acid 6.16 x 10-7 mm Hg at 36 C.

Aminopyralid acid 19 x 10-5 mm Hg.

Dissociation constant: pKa

Melting point: C.

Boiling point: 183-210 C (solvent).

Molecular weight:

Bulk density:

Specific gravity: 1.148

pH: 6.9 at 1% solution.

Flammability: Combustible C1.

Flashpoint: 82 C.

Autoignition: C.

Corrosivity: Non corrosive.

Shelf Life: 3 years. Stable under normal storage conditions.


Dike area to prevent herbicide entering water ways.

Absorb spill with earth, sand, clay or absorbent material.

Clean with water and detergent.

33 FIRE:

Extinguish with water spray, foam, carbon dioxide or dry agent. Foam is preferred because water can spread contamination.

Toxic fumes may be released in fire. Wear breathing apparatus or avoid smoke.



Ashton, F.M. and Crafts, A.S. (1981) Mode of Action of Herbicides. (Wiley-Interscience publication).

Kearney, P.C. and Kaufman, D.D. (1976). Herbicides. Chemistry, degradation and mode of action. Vol 1 & 2.

Dow AgoSciences (2007) Label 60830/0407.


Collated by HerbiGuide. For more information see or phone 08 98444064.