Declared plant in Western Australia Arrowhead (Sagittaria montevidensis)

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See also: Control Method | Weed description | Declared plants list

(Locality Code: C= City; S=Shire; T=Town)

Category: P1, P2

Location: for the whole of the State

Control Codes and Landholder Obligations

Recommended herbicides

:

Hammer

Herbicide	:	Hammer
Active ingredient	:	240 g/kg Carfentrazone – ethyl          (Group G)
Amount of product per 10 litres water	:	4.0 g
Rate of product use	:	400 g/ha
Time of application	:	Weeds should have 4 - 6 leaves
Remarks	:	Water should be held for at least 5 days.
More information	:	Treatment can be sprayed on or injected under the water surface. Other products 2,4-D and glyphosate used under minor use permits in other states Victoria and NSW.

Family:           Alismataceae

Form :             Aquatic

Status:            Not present in WA

                    (click to view image)

Introduced from South America, perennial or occasionally an annual, to 1 m tall.

Stems :         Erect 7-75 cm tall with 2-12  whorls of flowers at the apex.

Leaves:        Emergent broadly arrow shaped to 25 cm long and 20 cm wide with basal lobes 15 cm long and 10 cm wide. Submerged leaves linear and only sometimes slightly arrow shaped.

Flowers:       White and sometimes with a purple patch in the centre, about 2.5 cm in diameter in whorls of 3 lower female and upper are male.

Fruit:            A cluster of 1 seeded fruitlets.

Seeds:          Laterally flattened 1.5-3 mm long, beaked and with dorsal wings.

Other relevant information related to this topic:

·     Quarantine WA

·     Wetlands not weedlands

·     Permitted and quarantine species list