1 Trade nameManufacturerForm


Trounce - Glyphosate 835 g/kg + metsulfuron methyl 10g/kg as a dry flowable.

Cut-Out - Glyphosate 760.5 g/kg + metsulfuron methyl 63.2g/kg as a dry flowable.

4 CHEMICAL GROUP: M + B Herbicide


Glyphosate, Ally or Brush Off(metsulfuron)


A translocated, very short residual herbicide for the control of a wide range of weeds.


Best results when applied to actively growing plants. Dust or dirt on plants may reduce the effectiveness of Trounce.

Drought or nitrogen stressed plants are difficult to kill with Trounce.

If plants have been heavily grazed or defoliated they should be allowed to regrow until the root:shoot ratio is around 1 before application of herbicide or the rate of herbicide may need to be increased to achieve effective control.

Don't treat wet plants.

Thorough coverage of leaves and stems is desirable.

Rainfall within 6 hours of application may reduce effectiveness. Heavy rain within 2 hours of application may necessitate repeat spraying.

Don't allow this product to come in contact with galvanised or unlined steel containers because a highly flammable gas may be produced.

Spray drift may cause serious injury to desirable plants.

Remove stock from areas where Bracken or other toxic plants have been sprayed. Don't graze these areas until plants have completely browned.

Don't disturb, burn, cultivate or slash treated for one month after spraying.


Add 100 mL Pulse® Penetrant per 100 L water for hand spraying or 200 mL per 100 L for boom spraying. On some species up to 250 mL of Pulse® Penetrant per 100 L spray mix is required for maximum effect.


Hard water: Reduces the effectiveness. Calcium and di and trivalent ions cause the most effect. The effect can be partially overcome by adding 2 kg of ammonium sulphate per 100 litres of spray mix.

Salt: It is reasonably tolerant of salty (NaCl) water.

Colloids: Clay and mud in the water will reduce the effectiveness.

pH: High pH or alkaline water can cause reduced effectiveness because it is often associated with calcium and other ions in the water.

Tank life: Manufacturers recommend that all mixed herbicide should be used within 24 hours of mixing.

In acid water the metsulfuron component breaks down more quickly. The half life of the metsulfuron component of Trounce is expected to be about 2 weeks when mixed with rain water in summer.


See HerbiGuide.


A number of plants are resistant to Group B herbicides and these may be tolerant to Trounce. A few populations of Annual Ryegrass are tolerant to Group M herbicides and these may not be controlled by Trounce.


Wear a face shield or goggles and impervious gloves where contact with the undiluted herbicide may occur.

Avoid breathing dust or mist.


Inhibits ALS enzyme and EPSP synthase. This interferes with lipid(fat) production and N metabolism.

Uptake and translocation:

Absorbed mainly through leaves and shoots with minor absorption of metsulfuron through roots. Rapidly and highly translocated throughout the plant. It tends to concentrate at the growing tips.

Physiological effects:

Glyphosate component interferes with the shikimic acid pathway.

Residual Life and Breakdown:


Almost non selective at normal use rates.

Crop tolerance:

Varietal sensitivities:

Effect on Clover Species:

Effect on Medic Species:

Effect on Lucerne:

Effect on Native Plants:



Leaves usually turn yellow or red about from 1-6 weeks after spraying. Death of leaves and plants may take 3-6 months. In woody plants there may be some regrowth followed by death from the tips. New growth may show "witches broom" characteristics where the shoots are tightly bunched and resemble a witch's broom. Reduction in internode length often give affected plant a compact appearance.




Low toxicity.

It is harmful if swallowed and will irritate eyes and skin.

Do not inhale dust or mist.


Mammalian toxicity - Low.

Acute oral. Slightly toxic. LD50 - 4613 mg/kg (rats), [For comparison table salt is 3000 mg/kg]

Acute dermal; Glyphosate component - Practically non toxic. LD50 - >5000

mg/kg (rabbit). Metsulfuron component - slight to moderately toxic.

Skin - Non irritating

Eye - slightly to moderately irritating.

Vapour inhalation - Slightly toxic. LC50 - >1.9 mg/L air (rat). Prolonged exposure may cause upper respiratory tract irritation.

Chronic oral toxicity NOEL - ppm for two years.

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

Other Species -

Birds - low toxicity.

Fish - low toxicity LC50 > ppm.

Invertebrates - low toxicity.

Bees - low toxicity.



Contact a doctor or Poisons Information Centre on 13 11 26.

If Swallowed - Contact a doctor immediately. Induce vomiting preferably using Ipecac Syrup APF.

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.

If further treatment advice is required, contact 1800 033 111.


It has a half life in soil of 1 week to 1 month. Longer in alkaline soils.

It has an EPA classification for soil mobility that ranges from

Ground water contamination. Unlikely.

Replanting intervals. (based on metsulfuron) Wheat - 10 days, Linseed - 9 months, Barley - 6 weeks, Lucerne - 9 months, Peas - 9 months, Medics - 9 months, Lupins - 9 months, Clovers - 9 months, Safflower - 9 months, Japanese Millet - 14 months, Oats - 9 months, Maize - 14 months, Faba Beans - 9 months, Sorghum - 14 months, Chickpeas - 9 months, Sunflower - 14 months, Rapeseed - 9 months, Soybeans - 14 months. Soil residues will last longer in alkaline soils.

Accumulation in milk and tissues. Does not accumulate in milk or tissues.


Water solubility at 25 C. - dispersible and partly soluble.

Oil solubility - insoluble.

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

Vapour Pressure at 25 C. - Low

Dissociation constant - pKa

Melting point - C.

Molecular weight -

Half life in water - 33 days at pH5 and 25 C. 2.1 days at pH5 and 45 C.

Corrosive to mild steel, zinc and galvanised steel.


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.

3. Formulation : Dry flowable. Disperses and partially dissolves in water.

4. Poison Schedule : 0

6. Product colour : White granule.

7. Product Flammability : Flashpoint >93 (TCC). Non flammable. Non combustible.

8. Dangerous Goods Class : NA

9. Shelf Life : Long.

12. Effect of Soil Texture on Herbicide : Little effect.

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

14. Effect of Soil Organic Matter on Herbicide : Little effect.

21. Effect on Legume Species : Kills them.

22. Soil Moisture at Application :

DRY - Avoid if possible.

MOIST - Ideal.

WATERLOGGED - Avoid if prolonged.

23. Frost Effects :

24. Frost Free Days Required After Application :

26. Recommended Water Volume : 200 -3000 L/ha

27. Nozzle Type : Hand spraying - Use No.6 cone nozzle at more than 800 kPa for bushes less than 2 m round. Use No 8 cone nozzle and higher pressures for larger bushes.

Boom spraying - Use a flat fan nozzle at 240-280 kPa.

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

32. Rain Fastness : 6 hours.

33. Time Interval Before Effect is Noticed : 1-6 weeks.

36. Withholding Period : 0 days unless Bracken or toxic plants are present then grazing should be delayed until plants have died . Otherwise, if area is to be grazed 1-2 days is suggested to allow product to be translocated throughout target plant.

37. Plant-Back Period: (based on metsulfuron) Wheat - 10 days, Linseed - 9 months, Barley - 6 weeks, Lucerne - 9 months, Peas - 9 months, Medics - 9 months, Lupins - 9 months, Clovers - 9 months, Safflower - 9 months, Japanese Millet - 14 months, Oats - 9 months, Maize - 14 months, Faba Beans - 9 months, Sorghum - 14 months, Chickpeas - 9 months, Sunflower - 14 months, Rapeseed - 9 months, Soybeans - 14 months. Soil residues will last longer in alkaline soils.

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.

Numbered data adapted from "Crop Herbicide Information" by

A.J. Chambers.


Collated by HerbiGuide. For more information see or phone 08 98444064.