Salvinia control

Page last updated: Tuesday, 29 October 2019 - 8:31am

Please note: This content may be out of date and is currently under review.

Control methods for salvinia (Salvinia molesta) a declared pest in Western Australia. Report the presence of this organism before undertaking a control measure.


Information about this pest can be found on the salvinia: 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 aquatic weed control page.

Recommended herbicides


Herbicide: Diquat (Group L) (various trade names: see APVMA link)

Active ingredient

200g/L diquat                   

Rates of dilution for spot spraying


Amount of product/10L water



Glyphosate also used under Minor Use Permit in New South Wales

Rate of product/ha


Wetting agent dilution

1:600–1:1000 non-ionic such as BS-1000, or Agral® at 15mL/10L water

Time of application

Summer - when actively growing

More information and other control methods

  • Retreatment will be necessary each summer as regrowth appears. Results are not consistently good.
  • Mechanical removal can eradicate it from a water body but every plant must be removed. This is a very long and tedious method. Under ideal conditions rate of weed growth may exceed rate of mechanical removal.
  • Roundup® Biactive, registered in New South Wales
  • Metsulfuron @ 10g/100L water is registered as minor use permit in New South Wales

Contact information

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