Grader grass control

Page last updated: Wednesday, 18 September 2019 - 1:28pm

Please note: This content may be out of date and is currently under review.

Control methods for Grader grass (Themeda quadrivalvis) a declared pest in Western Australia.

Information about this pest can be found on the grader grass: declared pest page.

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 declared plant control handbook.

Recommended herbicides


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

Active ingredient

Glyphosate 360g/L
Various formulations

Rate of product

1L/100L water
Adjust for each formulation

Time of application

Foliar spray - apply when actively growing from December to March


Seedling or adult (individuals or infestation)

  • Spray topping (spraying seed)
  • May require wetting agent
  • Infestations around water must be sprayed with bioactive glyphosate


Contact information

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