Khaki weed (Alternanthera pungens)

Profile

Impact

Native of Brazil, Ecuador, Peru and Venezuela khaki weed is a prostrate herb with perennial root system with annual above ground growth.

Khaki weed spreads by seed within spiny bracts that adhere to tyres, clothing and animals. Local spread may also occur through spreading stems that root at nodes. Widespread in wasteland, caravan parks, orchards and recreation areas. Spines are a problem with dogs and stock but are particularly troublesome to humans and readily penetrate skin.

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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.


PERMIT 12362 Expires 30/11/2021
Triclopyr 300 g/L + Picloram 100 g/L (Grazon® DS)
Rate: 2.0 L/ha
Comments: Apply when secondary roots are present on the shown pasture. DO NOT spray tropical grasses before the early tillering stage. Apply when weeds are small and actively growing, preferably before flowering or vining. Legumes present at the time of spraying will be damaged. Refer to cautionary warning on product label.
Withholding period: Nil.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


2,4-D 300 g/L + Picloram 75 g/L (Tordon® 75-D)
Rate: 650 mL in 100 L of water
Comments: Active growth in full leaf.
Withholding period: 1-8 weeks (see label).
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


2,4-D amine 625 g/L (Amicide® 625)
Rate: 1.1 – 2.2 L/ha
Comments: Seedlings only.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


2,4-D LV ester 680g/L (Estercide® Xtra)
Rate: 800 ml to 1.15 L per hectare
Comments: Boom spray application for young seedlings
Withholding period: 7 days
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Amitrole 250 g/L + Ammonium thiocyanate 220 g/L (Various products)
Rate: 1.1 L in 100 L of water
Comments: Spot spray. Actively growing plants.
Withholding period: Nil
Herbicide group: Q, Bleachers: Inhibitors of carotenoid biosynthesis unknown target
Resistance risk: Moderate


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Legal requirements

Khaki weed (Alternanthera pungens) is not declared in NSW under the Noxious Weeds Act 1993.

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Reviewed 2016