Atrazine 900 Granules
1 Trade nameManufacturerForm
4FARMERS ATRAZINE 900 WG HERBICIDE4 FARMERS PTY LTDWG
AGROREG ATRAZINE 900 WG HERBICIDEAGROREG PTY LIMITEDWG
ATRADEX WG HERBICIDECROP CARE AUSTRALASIA PTY LTDWG
ATRAGRANZ HERBICIDECROP CARE AUSTRALASIA PTY LTDWG
ATRAQUEST 900 WG HERBICIDECONQUEST AGROCHEMICALS PTY LTDWG
CHEMAG ATRAZINE 900 WG HERBICIDEIMTRADE AUSTRALIA PTY LTDWG
CMS ATRAZINE 900 WG HERBICIDECMS TRADE PTY LTDWG
COUNTRY ATRAZINE 900 WG HERBICIDEACCENSI PTY LTDWG
FARMOZ FARMOZINE 900 WDG HERBICIDEFARMOZ PTY LIMITEDWG
GENFARM ATRAGEN 900 WG HERBICIDEGENFARM CROP PROTECTION PTY LTDWG
GESAPRIM GRANULES 900 WG HERBICIDESYNGENTA CROP PROTECTION PTY LIMITEDWG
GESAPRIM GRANULES HERBICIDESYNGENTA CROP PROTECTION PTY LIMITEDWG
KENSO AGCARE ATRAZINE 900 WG HERBICIDEKENSO CORPORATION (M) SDN BHDWG
NUFARM NU-TRAZINE 900 DF HERBICIDENUFARM AUSTRALIA LIMITEDDF
OZCROP ATRAZINE 900 WG HERBICIDECMS TRADE PTY LTDWG
RYGEL ATRAZINE 900DF HERBICIDERYGEL AUSTRALIA PTY LTDDF
SIPCAM ATRAZINE 900WG HERBICIDESIPCAM PACIFIC AUSTRALIA PTY LTDWG
SIPCAM PACIFIC MAIZINA 900 WDG HERBICIDESIPCAM PACIFIC AUSTRALIA PTY LTDWG
SUMMIT ATRAZINE 900DF HERBICIDESIPCAM PACIFIC AUSTRALIA PTY LTDDF
UNITED FARMERS ATRAZINE 900 WG HERBICIDEUNITED FARMERS CO-OPERATIVE COMPANY LTDWG

2 PRICE:

$8.8/kg


3 ACTIVE INGREDIENTS: Atrazine

Formulation: Water dispersible granule.

4 CHEMICAL GROUP: C - Triazine.

5 RELATED HERBICIDES:

Cyanazine, propazine, simazine, terbutryn.

6 GENERAL DESCRIPTION:

Atrazine is a translocated, pre and post emergence herbicide that is mainly absorbed by the roots with some foliar absorption. It controls a wide range of weeds in tropical (C4) grass crops, triazine tolerant crops, orchards, vineyards, plantations and fallow situations.

7 APPLICATION METHODS AND TIPS:

See Best Management Practices for Atrazine in Broadacre Crops.

Best residual weed control comes from split applications where an initial dose is applied and a half dose is applied each month until weeds have finished germinating.

For post emergence control of weeds the minimum rate is around 500 g/ha of atrazine900 with 1% spray oil. Weeds must be small and those with more than 4 leaves are not likely to be adequately controlled unless they are very shallow rooted species like Rat or Squirell-tailed Fescue (Vulpia species or Silver Grass).

9 ADJUVANTS:

For pre emergent applications no adjuvants are required.

For post emergent applications the mineral spray oils such as DC-Tron, DC-Trate, Spray Plus, Uptake, Ad-here and others at 1-2% provide far better control of most weeds than the esterified vegetable oils such as Hasten and Kwickin or wetting agents or multi purpose products such as LI700.

Results from the Birchip Group showed Radish control of 84-97% with 0.5-2% of mineral oils, 59-69% with 0.3-1% of esterified vegetable oils and 51% with 0.25% of wetting agent.

More atrazine is absorbed by susceptible plants and less by tolerant plants in good nutrient conditions and inactivation in tolerant plants is faster (1215, 1216) so better weed control and greatest crop safety occurs at optimum nutritional levels.

10 WATER QUALITY:

Hard water

Colloids

pH

11 COMPATIBILITY:

Trace elements.

12 EQUIPMENT:

14 HERBICIDE RESISTANCE:

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

Atrazine resistance in weeds will disappear a few years after the last application of triazine herbicides because the resistant plants are less competitive than the susceptible plants. Rotate to other herbicides when triazine resitance first appears.

15 REPLANTING INTERVALS:

CropTime

16 WITHHOLDING PERIODS:

28 days (grazing) for most crops.

6-15 weeks (grazing and harvesting) for canola.

18 PROTECTIVE CLOTHING:

19 SOIL:

20 MODE OF ACTION:

Inhibits photosynthesis at photosystem 2. Tolerant plants metabolise it.

Uptake and translocation:

Absorbed mainly by roots with some absorption through leaves.

Physiological effects:

Residual Life and Breakdown:

Selectivity:

23 PLANT SYMPTOMS:

Leaf yellowing and death along the edges of leaves followed by overall death. Some plants show strong veinal or inter-veinal yellowing.

SECONDARY EFFECTS:

24 TOXICITY:

Summary:

Slightly to moderately toxic to mammals. Atrazine is absorbed through the gastrointestinal tract, lungs and skin.

Details:

Poison schedule - S

Mammalian toxicity -

Acute oral LD50 - mg/kg (rats), [For comparison table salt is 3000 mg/kg]

Acute dermal LD50 - > mg/kg (rabbit).

Skin - Mild skin irritant (WHO classification)

Eye - Severe eye irritant (WHO classification)

Vapour inhalation - LC50 - > mg/L air (rat).

Chronic oral toxicity NOEL - ppm for two years.

Not carcinogenic, mutagenic or teratogenic (i.e. does not cause cancer or reproductive problems).

Acceptable Daily Intake (ADI) - 0.005 mg/kg bw/day.

NOEL - 0.5 mg/kg bw/day.

It is readily absorbed through the gastrointestinal tract, lungs and skin.

Symptoms

At high doses it can cause neuromuscular effects such as motor incoordination, paralysis of limbs, respiratory distress and hypothermia.

Other Species -

Birds - practically non toxic.

Fish - slight toxicity LC50 > ppm.

Invertebrates - Slight to moderate toxicity.

Bees - toxicity.

Algae - High toxicity. NOEC (No effect concentration) 0.0037 mg/L for Chlamydomonas reinhardii (Girling et al, 2000).

Highly toxic to duckweed.

Reports of effects on frogs are not likely to occur at levels of atrazine that occur in the field.

25 TOXICITY SYMPTOMS:

26 FIRST AID:

If SWALLOWED -

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. See a doctor.

Advice to doctor - Treat symptomatically.


27 ENVIRONMENTAL FATE:

It has a half life of 55 days at 20 degrees and 50% WHC in Mohlin soil. The half life in soil can vary considerably with Australian values ranging from 12 days to 140 days.

It is broken down mainly by chemical processes with some degradation due to micro-organisms, metabolism by plants and UV degradation on surfaces.

It has an EPA classification for soil mobility that ranges from moderately to highly mobile in soils with low clay or organic matter contents.

It has a leaching index of 10. (for comparison, trifluralin is 0-1 and chlorsulfuron is 25-30).

Ground water contamination risk is high in some situations. Most of the atrazine in aquatic ecosystems enters via surface runoff. 80-90% of the atrazine that occurs in streams, lakes and ground water is due to a few post application run off events (or storms) within a few weeks of application. In the US about 2% of the atrazine applied to the catchment is eventually discharged into the sea (USGS, 1999).

Bubb and Barnes (2000) have Australian results on atrazine in the environment.

Ecosystems are not likely to be affected with atrazine concentrations below 0.05 mg/L in the water (Giddings & Hall, 1998; Huber, 1993).

Replanting intervals

Accumulation in milk and tissues - does not accumulate in milk or tissues. Traces of the breakdown products (particularly 2-chloro-4,6-diamino-s-atrazine) are occasionally found in milk.

Degradation

In soil atrazine is moderately absorbed by the clay and organic matter and degrades mainly by chemical dealkylation (to form the more mobile desethylatrazine) and dechlorination reactions

28 REGISTERED CROPS: (Button)

29 REGISTERED WEEDS: (Button)

31 PROPERTIES:

Water solubility at 25 C. - 33 ppm at pH ; Moderately soluble, slightly hydrophilic.

Oil solubility -

Octanol:Water ratio at 25 C. - at pH 5;

Vapour Pressure at 25 C. -

Dissociation constant - pKa

Melting point - C.

Molecular weight -

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

Colour -

Odour -

Bulk density -

pH -

Flammability -

Usage

2100 tons of active ingredient were sold in Australia in 1998.

33 REFERENCES:

See

Acknowledgments:

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





2. Concentration of Active Constituent : 900 g/kg of Atrazine.

3 : Formulation : Water dispersible granules.

4. Poison Schedule : Exempt from scheduling.

8. Dangerous Goods Class : Not classed as a dangerous good.

10. Mixtures Compatibility :

2.4-D Amine Spray.Seed (paraquat + diquat)

Gramoxone(paraquat) Spray.Seed 200

Stomp 330E(pendimethalin)

11. Registered Crop(s) : Sorghum, Maintenance of fallow areas prior to sowing wheat, peas or lupins, maize.

12. Effect of Soil Texture on Herbicide : Do NOT use as a pre-emergent spray on light sandy soils.

13. Effect of Soil pH on Herbicide : High pH's (i.e. alkaline) increases residual life.

14. Effect of Soil Organic Matter on Herbicide : More readily adsorbed on muck or clay soils.

15. Mode of Action : Both root and shoot absorbed, latter of minor importance.

Selective and non-selective depending on timing of application. Preplant, pre-emergent or post-emergent but before weed seedlings are more than 3.8cm (1.5") high.

16. Application Timing : Pre-emergent - At or immediately after sowing and before crop and weeds emerge.

Post-emergent - As soon as possible after crop has emerged and has developed 2-3 leaves.

17. Rate Variations : 0.65 - 3.6 kg/ha.

18. Rates Selection : Lower rate will effectively control many common annual broadleaf species.

Higher rate non-selective weed control.

20. Effect on Crop : Damage will occur if applied with crop oil to stressed crops.

22. Soil Moisture at Application : Acts mainly through root absorption, therefore for satisfactory results it is essential that sufficient rain or irrigation to thoroughly wet soil through weed root zone occurs or is made within 10 days of spraying.

26. Recommended Water Volume : Minimum volumes:-Boom

Pre-plant/pre-em. 50L/ha Aircraft Pre-plant/pre-em. 15 L/ha

Post-emergence 100 L/ha Post-emergence 22 L/ha.

For aircraft application the need for good soil moisture at the time of application and follow up rain or irrigation within 10 days is critical.

27. Nozzle Type : Flat fan.

28. Recommended Nozzle Pressure : 200-300 kPa (29-43.5 psi).

29. Recommended filter Size : 50 to 80 mesh.

30. Recommended Wetter : Activator 90 at 125 m./100 L or X-77 at 250 ml/100 L or Agral 600 at 125mL/100L or Shirwet 600 at 125mL/100L when applying to weeds as a foliar spray.

31. Other Additives : Crop oil.

32. Rain Fastness : 6 hours.

33. Time Interval Before Effect is Noticed : 1-2 weeks.

34. Plant Symptoms : Leaf chlorosis (yellowing).

36. Withholding Period : 0 days.

37. Plant-Back Period : Do NOT plant crops other than those recommended on the label for at least 6 months following treatments of this product at rates of up to 1.3kg/ha and for 18 months following treatment of 1.3-3.9kg/ha. When rates exceed 3.9kg planting may not be possible for long periods afterwards.

38. Spray Tank Clean-Up : Flush with clean water.

Numbered data from "Crop Herbicide Information"

courtesy of A.J. Chambers, Vic. Dept of Food & Agric.