Primextra

1 Trade nameManufacturerForm
PRIMEXTRA GOLD HERBICIDESYNGENTA CROP PROTECTION PTY LIMITEDSC

3 ACTIVE INGREDIENTS: Atrazine 223 g/L + Metolachlor 277 g/L.

4 CHEMICAL GROUP: C + K. Herbicide

5 RELATED HERBICIDES:

Atrazine, Metolachlor, Simazine.

6 GENERAL DESCRIPTION:

A pre emergent, residual herbicide for the control of certain annual grasses and broad leaf weeds in Maize, Sugar Cane, Sweet Corn and oxabetrinil (Concep safener) treated Sorghum. It is of low toxicity to the operator, insects, birds and large aquatic life. It is toxic to algae and the atrazine component has potential to contaminate the ground water in some circumstances.

7 APPLICATION METHODS AND TIPS:

It requires rainfall or irrigation to move it into the root zone and allow uptake by weeds.
It is relatively ineffective on waterlogged soils and has a greater potential to move off target in these conditions.

10 WATER QUALITY:

Hard water
Colloids
pH

11 COMPATIBILITY:

See HerbiGuide.

14 HERBICIDE RESISTANCE:

Weeds tolerant to this herbicide are expected to develop with repeated use of this or related herbicides.

15 REPLANTING INTERVALS:

CropTime

16 WITHHOLDING PERIODS:

CropTypeTime
AllHarvest 
AllGrazing 

17 RE-ENTRY PERIOD:

Wear protective until spray has dried.

18 PROTECTIVE CLOTHING:

When handling concentrate;
Cotton overalls, washable hat, elbow length PVC gloves, goggles.
When spraying;
Cotton overalls, washable hat, elbow length PVC gloves, face shield or goggles.

19 SOIL:

20 MODE OF ACTION:

Uptake and translocation:

Absorbed through roots and young shoots.

Physiological effects:

Acts on the photosynthesis pathway at photo system II.

Residual Life and Breakdown:

21 SELECTIVITY:

Crop tolerance:

Plants tolerant to this herbicide have an alternative photosynthetic pathway.

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:

Yellowing, marginal scorching of leaves and death.

SECONDARY EFFECTS:

24 TOXICITY:

Summary:

A low toxicity herbicide.

Details:

Poison Schedule 5.
Mammalian toxicity -
Acute oral Low toxicity. LD50 - 2935 mg/kg (rats), [For comparison table salt is 3000 mg/kg]
Acute dermal Low toxicity. LD50 - > mg/kg (rabbit).
Skin - Slightly irritating. Non sensitiser.
Eye - Slightly irritating. Label warning is "Will damage eyes".
Vapour inhalation - Low toxicity. LC50 - > 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).

Other Species -

Birds - toxicity.
Fish - toxicity LC50 > ppm.
Invertebrates - toxicity.
Bees - toxicity.

25 TOXICITY SYMPTOMS:

Non specific.

26 FIRST AID:

Contact a doctor or Poisons Information Centre on 13 11 26.
If Swallowed - Contact a doctor immediately.
If on Skin - Wash skin thoroughly with soap and water.
If in Eyes - Flush with water for 15 minutes.
If Inhaled - Remove patient from contaminated area to fresh air.
Advice to Doctor:
Treat symptomatically. No specific antidote exists.

27 ENVIRONMENTAL FATE:

It has a half life in soil of .
It has an EPA classification for soil mobility that ranges from
Ground water contamination
Replanting intervals; 6 months for all non registered crops for rates up to 5.3L/ha and 18 months for rates above 5.3 L/ha. On soils with a pH (CaCl2) greater than 7 a test should be taken to determine herbicide levels.
Accumulation in milk and tissues.
Fish Toxicity: Slightly toxic. LC50(96hr) rainbow trout = 11 mg/L.
Invertebrate Toxicity: Low toxicity. LC50(48hr) Daphnia magna = 57 mg/L.
Bee Toxicity: Practically non toxic.
Bird Toxicity: Practically non toxic.
Earthworms: Practically non toxic.

31 PROPERTIES:

Water solubility at 25 C. - Suspensible
Oil solubility -
Octanol:Water ratio at 25 C. - at pH 5;
Vapour Pressure at 25 C. - NA
Dissociation constant - pKa
Melting point - NA
Molecular weight -
Half life in water - days at pH5 and 35 C.
Corrosiveness: Non Corrosive.

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.

Data Base Data.
6. Product colour : White Flowable suspension.
7. Product Flammability : Non Flammable.
8. Dangerous Goods Class : None.
9. Shelf Life :
10. Mixtures Compatibility :
12. Effect of Soil Texture on Herbicide : Increased risk of crop damage on sandy soils. Poorer weed control on very heavy soils or soils with high organic matter.
13. Effect of Soil pH on Herbicide : Residual life is longer on high pH (alkaline) soils.
14. Effect of Soil Organic Matter on Herbicide : Poorer performance on high organic matter soils.
15. Mode of Action :
16. Application Timing : Pre emergent.
17. Rate Variations :
18. Rates Selection :
19. Weeds Controlled : Certain grasses and broad leaf plants.
20. Effect on Crop :
21. Effect on Legume Species :
22. Soil Moisture at Application :
DRY - Incorporate herbicide if soil is dry.
MOIST - Ideal
WATERLOGGED - Don't use in waterlogged situations.
23. Frost Effects : NA
24. Frost Free Days Required After Application : NA
25. Effect of Application Water Quality on Herbicide :
Saline Water -
Soil Colloids -
26. Recommended Water Volume :
27. Nozzle Type : Flat fan.
28. Recommended Nozzle Pressure :
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 : A few weeks.
34. Weed Symptoms : Plants germinate then die.
35. Effect of Herbicide/Disease Interaction on Crop :
36. Withholding Period : 0 days.
37. Plant-Back Period : 6-18 or more 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 detergent and wash out.
Remove the nozzles and screens and clean separately.
39. Other Comments :
Numbered data adapted from A.J. Chambers.

Acknowledgments:

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