Hoary cress control

Page last updated: Friday, 4 January 2019 - 2:08pm

Control methods for hoary cress (Lepidium draba) a declared pest in Western Australia.

REPORT THE PRESENCE OF THIS PEST BEFORE UNDERTAKING CONTROL

Information about this pest can be found on the hoary cress: declared pest page.

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Chemical requirements

When using any agricultural chemicals please ensure that you always follow instructions on the label and any permit. Users of agricultural chemical products must always strictly comply with the directions on the label and the conditions of any permit. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website.

Chemical control options

Chemical control options can be found below. For other methods of control please refer to the aquatic weed control page, and the declared plant control handbook.

Recommended herbicides

Shortly after full emergence

  • Chlorsulfuron

Rosette to pre-flowering

  • Picloram + 2,4-D amine ; 2,4-D ester

Late rosette stage

  • Glyphosate; Roundup® Biactive

 

Herbicide: Picloram + 2,4-D amine (Group I) (various trade names: see APVMA link)

Active ingredient

75g/L picloram + 300g/L 2,4-D

Rates of dilution for spot spraying

1:120

Amount of product/10L water

80mL

Rate of product/ha

Not recommended

Time of application

Winter-spring from rosette to pre-flowering

Remarks

Re-treatment may be necessary

More information and other control methods

  • Cultivation not effective as root fragments will regenerate. Amitrole T® can be used in restricted spraying areas
  • Dicamba, dicamba + MCPA or 2,4-D ester and glyphosate 450 (1.2L/ha)

 

Herbicide: 2,4-D LV ester (Group I) (various trade names: see APVMA link)

Active ingredient

  1. 600g/L 2,4-D ester
  2. 680g/L 2,4-D ester

Rates of dilution for spot spraying

  1. 1:200
  2. 1:230

Amount of product/10L water

  1. 40mL for 600g/L
  2. 35mL for 680g/L

Rate of product/ha

  1. 4L for 600g/L
  2. 3L for 680g/L

Time of application

Winter-spring from rosette to pre-flowering.

Remarks

Suitable for larger areas. Re-treatment will be necessary.
Not as effective as picloram.

More information and other control methods

  • Care should be taken near crops sensitive to 2,4-D, or in areas where the restricted spraying regulations apply. Amitrole T® can be used in restricted spraying areas.
  • Dicamba, dicamba + MCPA or 2,4-D ester and glyphosate 450 (1.2L/ha)
  • An APVMA permit is required to apply the 800g/L 2,4-D ester formulation between 1 September to 30 April

 

Herbicide: Chlorsulfuron (Group B) (various trade names: see APVMA link)

Active ingredient

750g/kg chlorsulfuron

Rates of dilution for spot spraying

2g/100L

amount of product/10L water

0.2g

Rate of product/ha

20g

Wetting agent dilution

1:1000

Time of application

Shortly after full emergence.

More information and other control methods

  • Cultivation is not effective as root fragments will regenerate. Amitrole T® can be used in restricted spraying areas.
  • Dicamba, dicamba + MCPA or 2,4-D ester and glyphosate 450 (1.2L/ha)

 

Herbicide: Glyphosate (Group M) (various trade names: see APVMA link

Active ingredient

360, 450, 490, 500 and 540 g/L and 680 and 840g/kg glyphosate
Other concentrations are available

Amount of product/10L water

  • 50mL for 360g/L concentration
  • 40mL for 450g/L concentration
  • 36mL for 490 and 500g/L concentration
  • 33mL for 540g/L concentration
  • 25g for 680g/kg concentration

Adjust rates for other concentrations of glyphosate

Rate of product/ha

1.5L for 360g/L concentration

Wetting agent dilution

As per label for various formulations

Time of application

Late July to September. Plants in late rosette stage to flowering.

Remarks

Plant should be actively growing

More information and other control methods

Wiper application may be used where sufficient stem present. Mix 1L in 5-10L water

 

Herbicide: Roundup® Biactive, Razor® (Group M)

Active ingredient

360g/L glyphosate

Rates of dilution for spot spraying

1:200

Amount of product/10L water

50mL

Rate of product/ha

1.5L

Wetting agent dilution

1:400 of non-ionic product

Time of application

Late July to September, when plants in late rosette to flowering

Remarks

Preferred treatment of glyphosate for wet areas where shallow water is present

More information and other control methods

Wiper treatment may be useful when sufficient stem material present. Mix 1L in 5-10L water.

Contact information

Pest and Disease Information Service (PaDIS)
+61 (0)8 9368 3080