3 ACTIVE INGREDIENTS: 33 g/L imazamox plus 15 g/L imazapyr
Formulation
33 g/L Imazamox as the ammonium salt plus 15 g/L Imazapyr as the ammonium salt
Water soluble liquid formulation.
A similar mix may be made using Arsenal or Clearsol mixed with Raptor.
500 mL Intervix = 24 g Raptor plus 10 g Arsenal750 (or 30 mL Arsenal250).
4 CHEMICAL GROUP: B - Imidazolinones. ALS inhibitors.
5 RELATED HERBICIDES:
Arsenal, Flame, OnDuty, Raptor, Spinnaker.
6 GENERAL DESCRIPTION:
An early post emergence, translocated, leaf and root absorbed herbicide for many grasses and broad leaved weeds. It is used mainly in imidazolinone tolerant (IT or Clearfield) crops.
7 APPLICATION METHODS AND TIPS:
Best results on young actively growing weeds when applied in fine weather on moist soil and rain follows a day or two later.
Add 500-1000 mL spray oil per 100 L spray mix. 500 mL Hasten or Kwickin per 100 L spray mix is recommended by the manufacturers.
Poor results on stressed crops.
Do not use on TT or conventional Canola.
Add an antifoaming (silicone based) agent if using a suction probe to load chemical. Add chemical to nearly full spray tank to reduce foaming problems.
Long replanting intervals for many crops and pastures.
Do not apply within 50 m of wetlands and waterways.
Buffer Zones:
Do not spray within 50 m of waterways and wetlands.
8 WEATHER:
Rainfast in 2 hours for post emergence applications.
Frost effects: Poorer control in frosty conditions
Wind:
Inversions:
Temperature:
Delta T and relative humidity: Avoid application when Delta T is greater than
9 ADJUVANTS:
Wetting agents: Not required if spray oils are used.
Spray oils: Usually applied with 0.5-1% spray oil (eg Hasten, Kwickin)
10 WATER QUALITY:
Hard water - compatible with hard and soft water.
Salty water:
Colloids - .
pH
Tank life: 24 hours on the label. Expected to be several weeks.
11 COMPATIBILITY:
Trace elements.
See HerbiGuide for a full list of compatibilities.
Intervix + clopyralid + tepraloxydim(Aramo) mixes are stable for 24 hours.
12 EQUIPMENT:
Registered for application by ground equipment.
Label recommends application in a minimum of 70 L/ha water. Lower volumes down to 20 L/ha can be used if droplet density on the target is kept above 50 droplets/square centimetre.
Normally applied with water as a carrier by boom sprays using flat fan nozzles at 200-400 kPa.
13 SPRAYER DECONTAMINATION:
Clean up:
Remove nozzles and filters and clean separately. Triple rinse with water.
Decontamination:
Remove the nozzles and screens and clean separately and allow to soak in a mixture of 500 mL chlorine bleach per 10 L water for at least 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. Drain tank and flush with clean water for a minimum of 10 minutes. Rinse tank, hoses and boom thoroughly with clean water.
Rinse screens and nozzles and replace.
14 HERBICIDE RESISTANCE:
Plants resistant to group B herbicides will not be controlled by Intervix.
Many populations of Annual Ryegrass and some populations of Wild Radish tolerate group B herbicides. See HerbiGuide Information/Resistance for a full list of plants that have been recorded with resistance to group B herbicides.
15 REPLANTING INTERVALS:
Crop
Time
All other crops
34 months
Barley
10 months
Canola
34 months
Chickpea
10 months
Faba Bean
10 months
Field Pea
10 months
IT Canola
0 days
IT Wheat
0 days
Lucerne
10 months
Lupin
10 months
Oats
10 months
Pasture legumes
10 months
Triticale
10 months
Vetch
10 months
Wheat
10 months
For barley, oats, triticale and normal wheat in the following season:
Apply Intervix before September.
Do not plant cereals if rainfall from last application to sowing is:
<150 mm for rates <375 mL/ha
<200 mm for rates <500 mL/ha
<250 mm for rates <750 mL/ha
Do not use rates > 375 mL/ha in the Lower Great Southern of WA if cereals are to be planted in the following season.
16 WITHHOLDING PERIODS:
Crop
Type
Time
Canola
Harvest
Not required
Canola
Grazing
5 weeks
17 RE-ENTRY PERIOD:
After spray has dried. Wear protective clothing as above if it is necessary to work with plants that are still wet.
18 PROTECTIVE CLOTHING:
Wear cotton overalls buttoned to the neck and wrist, a washable hat, water proof gloves and footwear or equivalent.
19 SOIL:
Residual control of weeds may be poor when applied to soil that is dry at the surface and no rain follows application.
Crop damage is more likely under waterlogged conditions.
20 MODE OF ACTION:
Inhibits the acetolactate synthase (ALS) enzyme.
Uptake and translocation:
Absorbed through leaves and roots and translocated throughout the plant.
Physiological effects:
Residual Life and Breakdown:
Selectivity:
Crop may show transient yellowing and reduced growth rate about 2 weeks after application.
21 SELECTIVITY:
Crop tolerance:
Only apply to crops with imidazolinone tolerance (eg Clearfield). Conventional and triazine tolerant canola will be damaged.
Transient yellowing and slower growth of the crop following application may occur but rarely affects yield. These symptoms are more likely under poor growth conditions.
Varietal sensitivities:
Effect on Clover Species:
Damages clover.
Effect on Medic Species:
Damages medics.
Effect on Lucerne:
Damages lucerne.
Effect on Native Plants:
Most established native plants are tolerant. Damages seedlings of many native plants. Drift onto native species is not expected to give significant damage.
22 DISEASE AND INSECT EFFECTS:
There is a greater chance of damage in crops affected by insects or diseases.
23 PLANT SYMPTOMS:
Symptoms usually take 1-2 weeks to develop. Young foliage discolours (usually yellows) and may become distorted. Weeds may die about a month after application or remain stunted
SECONDARY EFFECTS:
24 TOXICITY:
Summary:
Details:
Poison schedule: Not a schedule poison
Mammalian toxicity: Low toxicity.
Acute oral LD50: >5000 mg/kg (rat). Low toxicity for imazamox and imazapyr. [For comparison table salt is 3000 mg/kg]
Vapour inhalation: LC50 > 6.3 mg/L air (rat) for imazamox. LC50 > 5.1 mg/L air (rat) for imazapyr
Chronic oral toxicity: NOEL 282 mg/kg for imazamox. 250 mg/kg/day for imazapyr.
Not carcinogenic, mutagenic or teratogenic in animal studies (i.e. does not cause cancer or reproductive problems).
Acceptable Daily Intake (ADI): 2.8 mg/kg/day for imazamox. 2.5 mg/kg/day for imazapyr.
Other Species:
Birds: LD50 >1846 mg/kg for bobwhite quail. Not toxic.
Fish: toxicity LC50 >100 mg/L for 96 hours for Rainbow trout for imazamox and imazapyr. Not toxic
Invertebrates: EC50 > 100 mg/L for 48 hours for Daphnia for imazamox and imazapyr. Low toxicity.
Bees: LD50 >25ug/bee. Not toxic.
Arthropods: toxicity.
Earthworms:
Algae:
25 TOXICITY SYMPTOMS:
26 FIRST AID:
If SWALLOWED: Rinse mouth with water. Drink plenty of water. Do NOT induce vomiting. Do NOT give anything by mouth to a semiconscious or unconscious patient. If vomiting occurs, place patient to avoid vomit entering lungs.
If in EYES: Irrigate with plenty of water.
If on SKIN: Rinse with plenty of water, remove contaminated clothing, wash with soap and water.
If INHALED: Remove patient to fresh air.
Advice to doctor: Treat symptomatically.
Contact the Poisons Information Centre on 131126.
27 ENVIRONMENTAL FATE:
Half life in soil: months
Half life in water: many days at pH5 and 35 C.
It has an EPA classification for soil mobility that ranges from
Ground water contamination
Accumulation in milk and tissues.
pH stability:
Photolysis rate:
Hydrolysis half life:
Biodegradation rate:
28 REGISTERED CROPS:
See HerbiGuide.
29 REGISTERED WEEDS:
See HerbiGuide.
30 REGULATION AND LEGAL:
UN number: None allocated.
CAS numbers: Imazamox - 114311-32-9. Imazapyr - 81334-34-1
Hazchem code: None allocated.
NOHSC classification:
Land transport:
Dangerous goods class: Not a dangerous good.
Sea transport:
Proper shipping name:
Class:
Packaging group:
EPG:
31 PROPERTIES:
Colour: Yellow to amber liquid.
Odour:
Form: Liquid, water soluble.
Empirical formula:
Water solubility: Soluble in water. mg/L at 25 C at pH ;
Oil solubility:
Octanol:Water ratio: LogPow = -1.03 at pH 5 for imazamox. 0.11 for imazapyr;
Soil organic carbon absorption coefficient (Koc):
Vapour Pressure: <0.013 mPa at 25 C for imazamox and imazapyr.
Dissociation constant: pKa = 2.3, 3.3, 10.8 for imazamox. 1.9, 3.6, 11 for imazapyr.
Melting point: C.
Boiling point: C.
Molecular weight:
Bulk density:
Specific gravity: 1.07-1.09.
pH: 6.6
Flammability: Not flammable.
Flashpoint: C
Autoignition: C
Corrosivity: Corrosive to mild steel. Non corrosive to stainless steel, polythene and plastics.
Shelf Life: years.
(When Stored under Ideal Conditions)
32 SPILLS:
Absorb spill with earth, sand, clay or absorbent material.
33 FIRE:
Not flammable.
Extinguish with water spray, foam, carbon dioxide or dry agent.
Toxic fumes may be released in fire including oxides of nitrogen. Wear breathing apparatus or avoid smoke.
34 COMMENTS:
Use of sulfonylurea herbicides on cereals on paddocks treated with Intervix in the previous season may cause crop damage.
35 REFERENCES:
Nufarm (2006) Intervix label 60683/0706
Nufarm (2006) MSDS.
Acknowledgments:
Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.