Narrow leaf cotton bush control

Page last updated: Friday, 13 April 2018 - 2:38pm

Control methods for narrow leaf cotton bush (Gomphocarpus fruticosus).

Information about this pest can be found on the narrow leaf cotton bush: 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.

Control options

Chemical control options can be found below. For other methods of control please refer to the narrow leaf cotton bush: what you should know page.

Chemical control options

The recommended herbicides for controlling narrow leaf cotton bush are glyphosate and triclopyr. Spraying is carried out when plants are actively growing, usually from spring to December.

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

Active ingredient

100, 360, 450, 470-480, 490, 500, 517, 540, 570g/L; 680, 700, 840 and 875g/kg glyphosate

Rate of product/ha

1:100 for 360 g/L formulation

Rate of product/10L water

  • 100mL for 360g/L formulation
  • 80mL for 450g/L formulation
  • 70mL for 490/500g/L formulation
  • 65mL for 540g/L formulation
  • 50g for 680g/kg formulation

Adjust rates for other formulations of glyphosate

Rate of product/ha Not recommended

Wetting agent

Wetting agent and/or summer spraying oil may be beneficial

Time of application

Cotton bush can be sprayed at any time when actively growing: September-December is the most effective time to spray before fruit forms.

Remarks

  • Glyphosate is effective on mature bushes, regrowth and seedlings, provided good coverage is achieved.
  • Where low volume/low pressure pumps are being used the rates should doubled.
  • Slash established bushes during winter, and burn, cultivate or grub seedlings and regrowth.
  • Roundup Biactive® or Razor® preferred treatment in wet areas or along water courses near shallow water.
  • The addition of 1g of metsulfuron/100L of water has also given improved control.

 Triclopyr (Group I) (various trade names: see APVMA link)

Active ingredient

600g/L triclopyr. A 755g/L formulation also available.       

Rate of product/10L water

30mL

Wetting agent

Use crop-oil such as Uptake® @ 500 mL 100 L, or DC-Trate @ 1L/100L

Time of application

Spring-December

Remarks

  • Use in place of glyphosate when annual pastures are still growing to avoid damage to grasses.
  • Other products containing triclopyr and picloram are also reasonably effective but further work is required.
  • Dicamba is effective on seedlings.

Contact information

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