Metazachlor

1 Trade nameManufacturerForm
BUTISAN HERBICIDEBASF AUSTRALIA LTD.SUSPENSION CONCENTRATE

2 PRICE:

$26.95/L

3 ACTIVE INGREDIENTS: Metazachlor 500g/L

4 CHEMICAL GROUP: K

5 RELATED HERBICIDES:

DevrinolNapropamide 500g/kg
DimethenamidDimethenamid-P 720 g/L
DualMetolachlor 720g/L
Dual GoldS-Metolachlor 960g/L
MetazachlorMetazachlor 500g/L
PyroxasulfonePyroxasulfone 850g/kg
Ramrod FlowablePropachlor 480g/L

6 GENERAL DESCRIPTION:

Metazachlor is a mainly absorbed through the germinating shoots and roots. It is translocated through the plant and has a short residual life in the soil. It will control many grasses and some broadleaved weeds. Its main use is for pre-emergent weed control of ryegrass, wild oats and wireweed in canola. Overseas it is used in brassica vegetables, tobacco, potato, ornamentals and nursery fruit trees as Sultan®. It presents little hazard to the environment.

7 APPLICATION METHODS AND TIPS:

Metazachlor is normally applied to bare soil or in combination with a knock down herbicide. Metazachlor has little effect on germinated plants. Rainfall is important to wash the herbicide from plant residue into the soil. High plant residue levels (e.g. >50% cover) may reduce weed control. For grass weed control, the ideal placement for metazachlor is just above the germinating seeds. Deeper incorporation appears beneficial for broadleaved weed control. This may be due to metazachlor being more efficiently absorbed by shoots and cotyledons of grasses compared to roots and vice versa for broadleaved species.

Plant crops below the herbicide band. Crop damage may occur on light soils and/or when heavy rain occurs within a few days of spraying.

Avoid planting system where the herbicide is thrown or concentrated in the adjacent planting furrow as this may damage the crop.

Best result occur when applied to uncultivated moist soil with the weed seeds on the surface and incorporation occurs within 3 days of spraying followed by light rain.

Avoid applying to ridged or cloddy seed beds.

Metazachlor should not be applied to wetlands.

Poor result may occur where soils are too dry for herbicide absorption or where heavy rain leaches the herbicide from the weed seed zone or where seeds are buried too deep. Weeds germinating in the planting row may not be controlled.

A knockdown herbicide is required if weeds are present at the time of spraying.

8 WEATHER:

Rainfast in 0 hours.

Frost effects: Little effect.

Wind: 3-20 kph preferred.

Inversions: Avoid spraying during inversion conditions to avoid the risk of drift.

Temperature: Little effect.

Delta T and relative humidity: No effect.

9 ADJUVANTS:

Wetting agents: Not required.

Spray oils: Not required.

10 WATER QUALITY:

Hard water: Not compatible

Salty water: Not compatible

Colloids:

pH:

Tank life: Should be long.

11 COMPATIBILITY:

Trace elements.

See HerbiGuide Compatibilities button.

12 EQUIPMENT:

Boom sprays:

Carrier volume: 80-250 L/ha but not critical.

Nozzles: Flat fan. A medium spray quality is preferred unless a partner herbicide requires otherwise.

Pressure: 150-400 kPa.

Droplet size:

Drift is rarely a significant issue.

Keep agitated during spraying.

Do not use filters finer than 50 mesh.

Aerial application:

Check registration.

Carrier volume: 30 L/ha.

13 SPRAYER DECONTAMINATION:

Clean Up:

Clean soon after spraying to reduce the risk of forming dried deposits that may be difficult to remove.

Remove filters and clean separately. Triple rinse with water or water plus 0.25% wetting agent and run through boom.

Decontamination:

Remove filters and clean separately.

Rinse with water and drain.

Quarter fill the tank with an alkali detergent (e.g. 500 mL or g of Drive, Dynamo, Omo, or Surf per 100 L water) and circulate for at least 15 minutes then run through boom. Rinse with water. Remove filters and clean separately. Replace them and rinse the whole system with water again.

14 HERBICIDE RESISTANCE:

Tolerant plants are expected to occur and may dominate the weed population after repeated applications.

15 REPLANTING INTERVALS:

CropTime
All other crops including Wheat, Durum, Barley, Oats, Field peas, Chickpeas, Lupins12 months

16 WITHHOLDING PERIODS:

CropTypeTime
CanolaGrazing12 weeks.
CanolaHarvestNot required

17 RE-ENTRY PERIOD:

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

18 PROTECTIVE CLOTHING:

Overalls, boots and washable hat. Use gloves and face shield when handling the concentrate.

19 SOIL:

Soil texture: May leach and cause crop damage in sandy soils.

Soil pH:

Soil organic matter: May leach and cause crop damage in low organic matter soils.

Soil moisture at application: Best results when applied to moist soil.

20 MODE OF ACTION:

Acts by inhibiting fatty acid synthesis.

It requires moist soil and rainfall to wash it into the top few centimetres of soil to be effective. The primary biochemical mechanism is unknown. Growth inhibition is due to a reduction in both cell division and enlargement. Longitudinal growth is reduced more than lateral growth. This results in a compact appearance of affected roots. Protein and fat synthesis, respiration, lignification and anthocyanin production are reduced. Hormonal effects also occur resulting in hormone like symptoms.

Selectivity of metazachlor is due to the ability of tolerant plants to metabolise the herbicide more rapidly than sensitive plants.

Uptake and translocation:

Metazachlor is absorbed by the roots of all germinating plants and transported upwards mainly in the xylem.

Physiological effects:

Residual Life and Breakdown:

Short residual of a few weeks.

21 SELECTIVITY:

Crop tolerance:

Crop damage may occur;
  1. Where deep planting furrows are infilled by soil throw, wind or rain.
  2. Where a heavy rainfall after application and before crop emergence occurs on soils prone to leaching.
  3. Other factors stress the germinating crop.
Varietal sensitivities:

Effect on Clover Species:

Effect on Medic Species:

Effect on Lucerne:

Effect on Native Plants:

Little effect.

22 DISEASE AND INSECT EFFECTS:

23 PLANT SYMPTOMS:

Expected to be similar to metolachlor which are;

Seeds normally germinate but often fail to emerge. Seedlings that do emerge have stunted and abnormal growth. The first leaf may fail to unfold. Roots are stunted and compact. Leaf senescence may be delayed.

SECONDARY EFFECTS:

24 TOXICITY:

Summary:

Harmful if swallowed. Suspected of causing cancer.

Details:

SUSMP classification (Poison schedule): S5.

Mammalian toxicity: Low

Acute oral LD50: 500-2000 mg/kg (rat), [For comparison table salt is 3000 mg/kg]

Acute dermal LD50: >4000 mg/kg (rabbit).

Skin: Not toxic. Not irritating. Not sensitizing.

Eye: Not irritating.

Vapour inhalation: Not toxic. LC50 > 6.2 mg/L air (rat).

Indication of possible carcinogenic effect in animal tests.

Not mutagenic or teratogenic in animal studies (i.e. does not cause cancer or reproductive problems in animal tests).

Chronic oral toxicity: NOEL mg/kg for two years.

Acceptable Daily Intake (ADI):

Other Species:

Highly toxic to aquatic species.

Birds: toxicity.

Fish: Moderate toxicity LC50 >10 to <15 mg/L, Oncorhynchus mykiss

Chronic toxicity to fish:

No observed effect concentration (28 d) 3.16 mg/l, Oncorhynchus mykiss

Invertebrates: Low toxicity. EC50 (48 h) > 100 mg/l, Daphnia magna

Chronic toxicity to aquatic invertebrates:

No observed effect concentration (21 d), 50 mg/l, Daphnia magna

Bees: toxicity.

Arthropods: toxicity.

Earthworms:

Algae: EC50 (72 h) 0.027 mg/L (growth rate), Pseudokirchneriella subcapitata

EC10 (72 h) 0.0125 mg/L (growth rate), Pseudokirchneriella subcapitata

Aquatic plants: EC50 (7 h) 0.033 mg/L, Lemna gibba

No observed effect concentration (7 h) < 0.005 mg/L

Accumulation: Not expected.

25 TOXICITY SYMPTOMS:

26 FIRST AID:

If SWALLOWED: Wash out mouth with water. Do NOT give anything by mouth to a semiconscious or unconscious patient.

If in EYES: Hold eyelids open and wash eyes with plenty of water for 5 minutes, remove contact lenses if present and wash for a further 10 minutes. See a doctor if symptoms persist.

If on SKIN: Remove contaminated clothing. Wash skin thoroughly with soap and water.

If INHALED: Remove patient to fresh air. See a doctor if symptoms persist.

Advice to doctor: Treat symptomatically.

Contact the Poisons Information Centre on 131126.

27 ENVIRONMENTAL FATE:

Very toxic to aquatic life with long lasting effects.

Half life in soil:

Half life in water: days at pH5 and 35 C.

It has an EPA classification for soil mobility that ranges from

Following exposure to soil, the product trickles away and can - dependant on degradation - be transported to deeper soil areas with larger water loads.
It has a leaching index of . (for comparison, trifluralin is 0-1 and chlorsulfuron is 25-30).

Ground water contamination:

Accumulation in milk and tissues:

pH stability:

Photolysis rate:

Hydrolysis half life:

Biodegradation rate:

Bioconcentration factor (BCF):

Metazachlor should not be applied to wetlands.

28 REGISTERED CROPS:

See HerbiGuide Species Solution tab.

29 REGISTERED WEEDS:

See HerbiGuide Species Solution tab.

30 REGULATION AND LEGAL:

APVMA Numbers:

UN number: 3082

CAS numbers: 67129-08-2

OPP Chemical Code:

Hazchem code: 3Z

SWA classification:

Land transport: ADG
Hazard class:9
Packing group:III
ID number: UN 3082
Hazard label: 9, EHSM
Proper shipping name: ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (contains METAZACHLOR)

Sea transport: IMDG

Proper shipping name: ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (contains METAZACHLOR)

Technical Name: METAZACHLOR
Hazard Class:9
ID Number: UN 3082.
Packaging group:III
EMS Number:

EPG:
Marine Pollutant:Yes.
Hazard label: 9, EHSM
Air transport: IATA/ICAO

Proper shipping name: ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (contains METAZACHLOR)

Technical Name: METAZACHLOR
ID Number: UN 3082.
Packaging group:III
Cargo Packing Instructions:

Passenger Packing Instructions:

Environmental Hazard:
Hazard Class:9
Hazard label: 9, EHSM


Hazard Statement:

Harmful if swallowed. Suspected of causing cancer. Very toxic to aquatic life. Very toxic to aquatic life with long lasting effects.

Risk phrases:

Safety phrases:

A downwind buffer zone of 50 m for aquatic areas and 20 m for sensitive terrestrial environments.

31 PROPERTIES:

Colour: White or pink

Odour: faint and fruity

Form: Liquid

Chemical name:

Empirical formula: C14H16ClN3O



IUPAC:

CAS:

Water solubility: dispersible.

Oil solubility:

Octanol:Water ratio: LogPow = 2.13 at 25 C at pH 5.

Soil organic carbon absorption coefficient (Koc):

Vapour Pressure: 23hPa at 25 C for solvent.

Vapour density:

Dissociation constant: pKa

Melting point: -8 C crystalizes.

Boiling point: 100 C.

Molecular weight:

Bulk density: 1.15 g/cm3

Specific gravity:

Viscosity: dynamic 82 mPa.s

pH: 5-8

Flammability: Not highly flammable

Flashpoint: none.

Autoignition: 552 C.

Corrosivity:

Shelf Life: years.

(When Stored under Ideal Conditions)

32 SPILLS:

Absorb spill with earth, sand, clay or absorbent material such as vermiculite.

Ventilate area after cleanup.

33 FIRE:

Extinguish with water spray, foam, carbon dioxide or dry agent.

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

34 COMMENTS:

35 REFERENCES:

BASF (2017) Butisan label 80664/101359

BASF (2017) Butisan SDS.

ADAMA Sultan label.

Acknowledgments:

Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.