3 ACTIVE INGREDIENTS: Imazapic 240g/L as an aqueous concentrate.
4 CHEMICAL GROUP: B Herbicide. Imidazolinone.
5 RELATED HERBICIDES:
Imazapic is sometimes referred to as imazameth.
6 GENERAL DESCRIPTION:
A residual herbicide for the pre emergence control of some grasses and broadleaved weeds.
7 APPLICATION METHODS AND TIPS:
Long replant times. 4 months and 200 mm rain is required before tolerant crops such as Wheat, Barley and Chickpea can be planted.
Do not apply to waterlogged soils.
9 ADJUVANTS:
Not necessary.
10 WATER QUALITY:
Hard water
Colloids
pH
Tank life: Long.
11 COMPATIBILITY:
Trace elements.
14 HERBICIDE RESISTANCE:
Weeds tolerant to group B herbicides may not be controlled by imazapic. Annual ryegrass, Wild Oats and Wild Radish are expected to develop resistance after several applications.
15 REPLANTING INTERVALS:
Crop
Time
16 WITHHOLDING PERIODS:
Crop
Type
Time
All
Harvest
All
Grazing
17 RE-ENTRY PERIOD:
18 PROTECTIVE CLOTHING:
Use elbow length PVC gloves when handling the concentrate.
19 SOIL:
20 MODE OF ACTION:
Inhibitor of the ALS (acetolactate) enzyme.
Uptake and translocation:
Root absorbed.
Physiological effects:
Residual Life and Breakdown:
21 SELECTIVITY:
Relatively non selective.
Crop tolerance:
Varietal sensitivities:
Effect on Clover Species:
Effect on Medic Species:
Effect on Lucerne:
Effect on Native Plants:
22 DISEASE AND INSECT EFFECTS:
23 PLANT SYMPTOMS:
SECONDARY EFFECTS:
24 TOXICITY:
Summary:
Low toxicity but may irritate eyes.
Details:
Poison Schedule - Exempt.
Mammalian toxicity - Very low.
Acute oral LD50 - Practically non toxic. >5000 mg/kg (rats), [For comparison table salt is 3000 mg/kg]
Acute dermal LD50 - >5000 mg/kg (rabbit).
Skin - May be slightly irritating.
Eye - Irritating.
Vapour inhalation - Practically non toxic. LC50 - >2.38 mg/L air (rat).
Chronic oral toxicity NOEL - ppm for two years.
Not mutagenic or teratogenic (i.e. does not cause cancer or reproductive problems).
Anaemia and liver effects seen at high doses and muscle effects at lower doses from chronic exposure. No adverse effects expected in the field.
Other Species -
Birds - toxicity.
Fish - toxicity LC50 > ppm.
Invertebrates - toxicity.
Bees - toxicity.
25 TOXICITY SYMPTOMS:
26 FIRST AID:
Contact a doctor or Poisons Information Centre on 13 11 26.
If Swallowed - Induce vomiting. Contact a doctor.
If on Skin - Wash skin thoroughly with soap and water. See a doctor if irritation persists.
If in Eyes - Flush with water for 15 minutes. See a doctor if irritation persists.
If Inhaled - Remove patient from contaminated area to fresh air.
Advice to Doctor - Treat symptomatically.
27 ENVIRONMENTAL FATE:
It has a half life in soil of weeks to months. The half life is reduced in waterlogged conditions.
It has an EPA classification for soil mobility that ranges from
Ground water contamination.
Replanting intervals: Wheat, Barley and Chickpea - 4 months.
Mung Bean, Lucerne - 12 months.
Sorghum, Cotton, Sunflower - 24 months.
All other crops - 36 months.
Accumulation in milk and tissues.
Do not spray within 50 metres of waterways or wetlands.
31 PROPERTIES:
Water solubility at 25 C. - Fully miscible.
Oil solubility -
Octanol:Water ratio at 25 C. - at pH 5;
Vapour Pressure at 25 C. - 65% volatiles as water
Dissociation constant - pKa
Melting point - Liquid.
Molecular weight -
Half life in water - days at pH5 and 35 C.
Flash Point - >900C.
Density - 1.07-1.09 kg/L
33 REFERENCES:
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.
Numbered Data
4. Poison Schedule : 0
6. Product colour : amber to green-brown clear liquid.
7. Product Flammability : Nil.
8. Dangerous Goods Class : NA
9. Shelf Life :
12. Effect of Soil Texture on Herbicide :
13. Effect of Soil pH on Herbicide :
14. Effect of Soil Organic Matter on Herbicide :
15. Mode of Action : ALS inhibitor.
16. Application Timing : Pre emergent.
17. Rate Variations : 150-200 mL/ha
18. Rates Selection :
20. Effect on Crop :
21. Effect on Legume Species :
22. Soil Moisture at Application :
DRY - Requires moisture for activation.
MOIST - Ideal
WATERLOGGED - Reduced residual activity
23. Frost Effects :
24. Frost Free Days Required After Application :
25. Effect of Application Water Quality on Herbicide :
Saline Water -
Soil Colloids -
26. Recommended Water Volume : More than 50 L/ha
27. Nozzle Type : Flat fan.
28. Recommended Nozzle Pressure : 200-300 kPa
29. Recommended Filter Size : Mesh size as suitable for nozzle being used.
30. Recommended Wetter : None.
31. Other Additives : None.
32. Rain Fastness : 0 hours.
33. Time Interval Before Effect is Noticed :
34. Weed Symptoms :
35. Effect of Herbicide/Disease Interaction on Crop :
36. Withholding Period : 35 days.
37. Plant-Back Period : Wheat, Barley and Chickpea - 4 months.
Mung Bean, Lucerne - 12 months.
Sorghum, Cotton, Sunflower - 24 months.
All other crops - 36 months.
Spray Tank Clean-Up : Drain tank and flush with clean water for a minimum of 10 minutes. Fill the tank with clean water and rinse with a boom cleaning agent.
Remove the nozzles and screens and clean separately.
39. Other Comments :
Numbered data adapted from "Crop Herbicide Information"
by A.J. Chambers.
Acknowledgments:
Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.