Paterson’s curse control

In cereals

Chlorsulfuron; Metsulfuron methyl; Triasulfuron; Tigrex; Broadstrike; Jaguar; Bromoxynil + MCPA

In pasture, up to four leaf stage

Jaguar®; Tigrex®; Broadstrike®; Bromoxynil + MCPA

At early flowering, seed set control

Chlorsulfuron; Metsulfuron methyl; Triasulfuron; Glyphosate + 2,4-D LV ester

1. 500g/L 2,4-D amine
2. 625g/L

Not recommended

Not recommended

1. 0.75L for 'spray grazing' - 1.6L for rosettes less than 10 leaves
2. 0.6L for 'spray grazing' - 1.3L for rosettes less than 10 leaves

'Spray grazing’, winter - from three weeks after germination

'Spray graze’ technique for selective control in pastures

‘Spray grazing’ apply low rate (0.75L) of 2,4-D amine (500g/L) or MCPA (1L/ha) and heavy graze at four to six times normal stocking rate from seven to ten days after treatment. Best results in small paddocks 10-20ha.  Other formulations of 2,4-D amine are available and if using these adjust rates accordingly.

750g/kg chlorsulfuron

1g/50L

0.2g

15–20g

1:400

• In cereals: wheat pre-sowing. Wheat, barley and oats post-emergence.
• In pasture: apply at early flowering to prevent seed formation. The addition of 750mL-1L of 2,4-D amine (500g/L) will improve the control.

• Ensure chlorsulfuron is thoroughly dissolved when using small quantities prior to adding to tank mix.
• May also be used for spot spraying, roadsides etc. Can be used in non-legume pastures. Spot spraying recommendations are based on 20g/ha.
• An application of 1g/L through a blanket wiper can also be effective in pasture where reduced damage to subterranean clover is desired.

Application of 10–15g/ha at flowering prevents seed formation. Addition of 2,4 –D amine at 10mL/10L or 1L/ha will improve control of seed formation.

600g/kg metsulfuron-methyl

5g

0.5g/100L water

1:400

• In cereals: pre-sowing in wheat only. Post-emergence in wheat and barley.
• In pastures: at flowering of Paterson's curse for seed control.

More effective on older plants, that is, August – September

Addition of 2,4 –D amine @ 1L/ha of 500g/L or 0.8L of 625g/L will improve control of seed formation.

714g/kg triasulfuron

1. 30g
2. 15g

1. Apply pre-emergence to wheat only
2. At early flowering of Paterson’s curse for control of seed formation on plants growing along road sides

For seed set control. Addition of 0.75-1L 2,4-D amine (500g/L) or 0.6 – 0.8L/ha of the 625g/L 2,4-D amine concentration will give a quicker kill of seeds.

• Triasulfuron, metsulfuron or chlorsulfuron @ 1g/L of water are effective for controlling seed set when used through a ‘Blanket wiper’ on plants that have run up in pasture.
• Resistance has developed to these chemicals so it is important to rotate use.
• Results are poorer once green/black seeds of Paterson’s curse are present.

1. 360g/L or
2. 450g/L glyphosate (Group M) + 600g/L or 680g/L 2,4-D LV ester (Group I)

Other concentrations of glyphosate are available. Adjust rates if using them.

1. 5mL or
2. 4mL

+ 5mL LV ester

1. 500mL or
2. 400mL

+ 500mL of 2,4-D LV ester

At early flowering

Where Paterson's curse is growing in drains or near water courses the herbicide Roundup Biactive® should be used. An APVMA permit is required to apply 2,4-D ester (80%) from 1 September until 1 May. Alternative formulations of 2,4-D are available to substitute the 80% formulation. Rates should be adjusted for the different formulations.

Glyphosate is suitable for spot spraying in non-selective situations. Care should be taken to check for restricted spraying permits when applying 2,4-D ester. This treatment is only suitable in cereal growing areas where there are no commercial vineyards or tomato gardens.

250g/L bromoxynil (Group C) + 25g/L diflufenican (Group F)

500-750mL/ha

Lower rate for plants with less than two leaves, higher rates for plants with up to four leaves

Registered in cereals and pastures, including cover crops in vineyards

Similar product Barracuda registered @ 600mL for small Paterson’s curse

250g/L MCPA (Group I) + 25g/L diflufenican  (Group F)

1L/ha

Up to four leaf stage

Clovers should have three trifoliate leaves

Some yellowing of clovers may occur. Check label for tolerance of various clovers.

800g/kg flumetsulam

25g/ha

1:400 BS 1000 or Uptake® at 500mL/100L

Safe on clovers. Appears more effective in the south west. Clovers should have three trifoliate leaves. Paterson’s curse around metro areas has developed resistance to this herbicide as well as the sulfonyl areas.

Restrictions on grazing or cutting for stockfeed as follows:

• Medic/clover three days.
• Wheat eight weeks after treatment.
• Improved control has been obtained when this product is mixed with terbutryn (Igran) @ 300-500mL/ha. If using this mixture with Broadstrike, do not use the spraying oil Uptake®. Only use a non-ionic wetting agent.