Information about this pest can be found on the hydrocotyl: 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 and the declared plant control handbook.
Recommended herbicides | Any time when green leaf surface exposed
Actively growing plants
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| Herbicide: Diquat (Group L) (various trade names: see APVMA link) | |
| Active ingredient | 200g/L diquat |
| Rates of dilution for spot spraying | 1:100 |
| Amount of product/10L water | 100mL |
| Rate of product/ha | 10L |
| Wetting agent dilution | 1:400 |
| Time of application | Any time when green leaf surface exposed |
| Remarks | Not very effective on large areas because regrowth occurs. Higher rates of 50L/ha to a water depth of 1m may work but expensive. |
| Herbicide: Roundup Biactive®, Razor®, Eraze®, Weedmaster® 360 Herbicide (Group M) | |
| Active ingredient | 360g/L glyphosate as the isopropylamine salt ; |
| Rates of dilution for spot spraying | 100mL |
| Amount of product/10L water | 1:1000 - Using a non-ionic surfactant such as BS-1000 |
| Rate of product/ha | 10L |
| Wetting agent dilution | 1:1000 - Using a non-ionic surfactant such as BS-1000 |
| Time of application | Summer to winter |
| Remarks |
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