Canadian pond weed control

Page last updated: Wednesday, 31 August 2016 - 10:49am

Please note: This content may be out of date and is currently under review.

Control methods for Canadian pond weed (Elodea canadensis) a declared pest in Western Australia. Report the presence of this organism before undertaking a control measure.

Report the presence of this pest before undertaking control

Information about this pest can be found on the Canadian pond weed: 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.

Control options

Chemical control options can be found below. For other methods of control please refer to the aquatic weed control page.

Chemical control options

Recommended herbicides Coptrol, Diquat


Herbicide: Coptrol

Active ingredient

107g/L present as mixed copper chelates

Rate of product


Time of application

Water temperature at least 15oC

Wetting agent

Non-ionic @ 1mL/L of water

Remarks and more information

  • Full effect may take up to five days. Reapply after 14 days if required.
  • Use in lakes, potable water, reserves, farms, fish and industrial ponds, hatcheries, ditches and canals.

Herbicide: Diquat (Group L)

Active ingredient

200g/L diquat

Rate of product/10L water


Time of application

Summer when plant is actively growing

Remarks and more information

  • Diquat should be sprayed onto or injected into still or slow moving water. Mixing the water is desirable but avoid stirring up mud as chemical not effective in muddy water.
  • Do not use water for irrigation for at least 10 days.
  • A concentration of 0.5–1ppm is required; this is 1mL Reglone in 1m2 surface area x 1m depth.

Contact information

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