Duckweed (Lemna minor)

Profile

Impact

Duckweed can form a dense green mat on the surface of a slow-moving or stationary water body in nurtrient rich conditions. They are an important food source for birds and aquatic animals. 

Description

Duckweeds are tiny, free-floating plants that are native to Australia. They include the smallest flowering plants on Earth. Duckweeds have tiny, white, barely visible flowers, and spread mainly by fragments.

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Control

Herbicide options

WARNING - ALWAYS READ THE LABEL
Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website www.apvma.gov.au

See Using herbicides for more information.


Diquat 200 g/L (Reglone®)
Rate: 400 mL in 100 L of water
Comments: Spray to wet all foliage thoroughly, add Agral 600.
Withholding period: 1 day in pasture, 10 days in treated water.
Herbicide group: L, Inhibitors of photosynthesis at photosystem I (PSI inhibitors)
Resistance risk: Moderate


Diquat 200 g/L (Reglone®)
Rate: 5.0–10.0 L/ha
Comments: Observe withholding period.
Withholding period: 1 day in pasture, 10 days in treated water.
Herbicide group: L, Inhibitors of photosynthesis at photosystem I (PSI inhibitors)
Resistance risk: Moderate


Orange oil 55.2 g/kg (Water Clear®)
Rate: 1 .0 L per 100 L of water
Comments: Spray on to free-floating plants.
Withholding period: Nil.
Herbicide group: n/a
Resistance risk: n/a


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Legal requirements

Duckweed (Lemna minor) is not declared in NSW under the Noxious Weeds Act 1993.

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Reviewed 2014