Japanese sunflower (Tithonia diversifolia)

Profile

Impact

It is a serious environmental weed, forming dense thickets and out-competing native vegetation. 

Description

Japanese sunflower is native to Central America. It is a robust and bushy plant, that can be short-lived or long-lived, growing up to 3 m tall. Its leaves have three or five pointed lobes and scalloped margins. Its large yellow daisy-like flower-heads are about 10 cm across and have yellow centres. 

Habitat

It occurs in coastal and tropical areas of NSW and QLD.

References

Weeds of Australia, Biosecurity Queensland. 

back to top

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.


Metsulfuron-methyl 300 g/kg + Aminopyralid 375 g/kg (Stingerâ„¢)
Rate: 20 g in 100 L of water
Comments: Hand gun application.
Withholding period: 3 - 56 days (see label)
Herbicide group: B, Inhibitors of acetolactate synthase (ALS inhibitors) + I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: High/Moderate


Metsulfuron-methyl 600 g/kg (Brush-off®)
Rate: 10 g in 100 L of water
Comments: Apply to actively growing plants after full leaf expansion but before seed set. Add surfactant.
Withholding period: Nil (recommended not to graze for 7 days before treatment and for 7 days after treatment to allow adequate chemical uptake in target weeds).
Herbicide group: B, Inhibitors of acetolactate synthase (ALS inhibitors)
Resistance risk: High


Picloram 100 g/L + Triclopyr 300 g/L + Aminopyralid 8 g/L (Grazon Extra®)
Rate: 350 mL in 100 L of water
Comments: Apply as foliar spray pre-flowering
Withholding period: Where product is used to control woody weeds in pastures there is a restriction of 12 weeks for use of treated pastures for making hay and silage; using hay or other plant material for compost, mulch or mushroom substrate; or using animal waste from animals grazing on treated pastures for compost, mulching, or spreading on pasture/crops.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Picloram 44.7 g/kg + Aminopyralid 4.47 g/L (Vigilant II ®)
Rate: Undiluted
Comments: Cut stump/stem injection application. Apply a 3–5 mm layer of gel for stems less than 20 mm. Apply 5 mm layer on stems above 20 mm .
Withholding period: Nil.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Triclopyr 300 g/L + Picloram 100 g/L (Grazon® DS)
Rate: 350 mL in 100 L of water
Comments: Apply as a foliar spray pre-flowering.
Withholding period: Nil.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


back to top

Legal requirements

Japanese sunflower (Tithonia diversifolia) is not declared in NSW under the Noxious Weeds Act 1993.

back to top


Reviewed 2014