Express
1 Trade nameManufacturerForm
CHEMAG RAPID 750 WG HERBICIDEIMTRADE AUSTRALIA PTY LTDWG
DUPONT EXPRESS HERBICIDEDU PONT (AUSTRALIA) LTDDF

3 ACTIVE INGREDIENTS: Tribenuron methyl

Formulation: Dry flowable.

4 CHEMICAL GROUP: B - sulfonylurea

5 RELATED HERBICIDES:

Ally, Glean, Logran, Oust.

6 GENERAL DESCRIPTION:

A broad leaf herbicide with a shorter residual life than most of the other sulfonylurea herbicides.

7 APPLICATION METHODS AND TIPS:

Apply to actively growing plants.

Addition of a wetting agent and spray oil combination (eg. Uptake) at 1 L per 100 L of spray mix will usually improve weed control.

Use spray solution within a day or two of mixing because the chemical breaks down in water.

Allow a week or two for regrowth before spraying if plants have been heavily grazed.

10 WATER QUALITY:

Hard water

Colloids

pH

11 COMPATIBILITY:

Trace elements.

14 HERBICIDE RESISTANCE:

Some plant populations may be resistant or develop resistance after multiple use. If plants survive treatment with tribenuron they should be tested for resistance and controlled with herbicides from other groups to reduce the risk of resistance build up.

18 PROTECTIVE CLOTHING:

Wear elbow length PVC gloves, face shield or goggles when handling and mixing concentrate.

20 MODE OF ACTION:

Uptake and translocation:

Mainly leaf absorbed with some root absorption.

Physiological effects:

Inhibits the acetolactate synthase (ALS) enzyme.

Residual Life and Breakdown:

Selectivity:

Has little effect on most grasses.

23 PLANT SYMPTOMS:

Reduced growth and reddening of leaves. Symptoms may take several weeks to develop and take longer in cold, dry conditions.

SECONDARY EFFECTS:

24 TOXICITY:

S5 poison.

Summary:

Low toxicity to humans and the environment.

Details:

Mammalian toxicity - Low.

Acute oral LD50 - >5000 mg/kg (rats), [For comparison table salt is 3000 mg/kg]. Not likely to be hazardous by ingestion. Animal effects include loss of appetite and weight.

Acute dermal LD50 - >2000 mg/kg (rabbit).

Skin - Irritant. May cause allergic skin rashes.

Eye - Irritant. May cause discomfort, tears and blurring of vision.

Vapour inhalation - LC50 - >6.7 mg/L air (rat).

Chronic oral toxicity NOEL - ppm for two years. Animal effects include increase liver and thyroid/parathyroid weights, body weight loss and slight testicular atrophy.

Not mutagenic or teratogenic (i.e. does not cause cancer or reproductive problems). Developmental effects noted in rats at doses toxic to the dam. Increased incidence of mammary tumours in rats at high dose rates.

Other Species -

Birds - Low toxicity. LD50 >2250 mg/kg. Dietary LC5620 >5620 ppm.

Fish - Low toxicity. LC50 >1000 ppm (96 hour Rainbow Trout).

Invertebrates - toxicity.

Bees - toxicity.

25 TOXICITY SYMPTOMS:

26 FIRST AID:

If swallowed - No action is normally required. Contact a doctor.

If in eyes - Flush eye with water for 15 minutes. Contact a doctor.

If on skin - Wash with soap and water.

If inhaled - No action is normally required. Contact a doctor.

Advice to doctor - Treat symptomatically.

27 ENVIRONMENTAL FATE:

It has a half life in moist soil of one to several days.

It has an EPA classification for soil mobility that ranges from

Ground water contamination - Unlikely to cause ground water contamination because it breaks down by chemical hydrolysis in water.

Replanting intervals - 3 days for cereals. 7-21 days for summer crops such as Maize, Mung Beans, Sorghum, Soybeans, and Sunflowers.

Accumulation in milk and tissues.

31 PROPERTIES:

Water solubility at 25 C. Dispersible - ppm at pH ;

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 - several days at pH5 and 35 C.

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.

Field Crop Herbicide Information:

CHEM NAME

4. Poison Schedule : S5

6. Product colour : Light brown.

Product odour : Slightly pungent.

7. Product Flammability : Not a fire or explosion hazard but may form explosive mixtures in air under severe dusting conditions. Decomposes with heat.

8. Dangerous Goods Class :

9. Shelf Life : Long if kept dry.

10. Mixtures Compatibility :

11. Registered Crop(s) :

12. Effect of Soil Texture on Herbicide :

13. Effect of Soil pH on Herbicide : More residual in high pH (alkaline) soils.

14. Effect of Soil Organic Matter on Herbicide :

15. Mode of Action : ALS inhibitor.

16. Application Timing : Post emergent.

17. Rate Variations :

18. Rates Selection :

19. Weeds Controlled : Broad leaf.

20. Effect on Crop :

21. Effect on Legume Species : Toxic to legumes.

22. Soil Moisture at Application :

DRY - Poorer control if plants stressed.

MOIST - Ideal.

WATERLOGGED - Poorer control if plants stressed.

23. Frost Effects : Poorer control if plants stressed.

24. Frost Free Days Required After Application : 3 days.

25. Effect of Application Water Quality on Herbicide :

Saline Water -

Soil Colloids -

26. Recommended Water Volume : Minimum of 30 L/ha for booms and 20 L/ha for aerial application. Company recommends 50 L minimum for booms.

27. Nozzle Type : Flat fan.

28. Recommended Nozzle Pressure : 200-450 kPa.

29. Recommended Filter Size : Mesh size as suitable for nozzle being used.

30. Recommended Wetter - Non ionic wetter or Wetter plus spray oil combination.

31. Other Additives :

32. Rain Fastness : 2 hours.

33. Time Interval Before Effect is Noticed : 1 to 3 weeks.

34. Weed Symptoms : Reduced growth. Discolouration. Death.

35. Effect of Herbicide/Disease Interaction on Crop :

36. Withholding Period : 0 days.

37. Plant-Back Period : 3-21 days.
38.Spray Tank Clean-Up : Drain tank and flush with clean water for a minimum of 10 minutes. Fill tank with clean water and add 300 mL household chlorine (4%) bleach/100 L water, flush hoses and stand 15 minutes with agitation engaged, repeat. Rinse tank, hoses and boom thoroughly with clean water to remove traces of bleach. Remove and clean nozzles and screens separately. Remove all traces of liquid fertilisers or adjuvants containing ammonia, such as ammonium sulphate or ammonium nitrate, before adding chlorine bleach, because bleach and ammonia will react to release a toxic gas.
39. Other Comments :

Numbered data adapted from "Crop Herbicide Information"

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

Acknowledgments:

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