Prickly Acacia

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Prickly Acacia control

Access all the information needed for control of this noxious weed, including weed identification, herbicide application and spray timings.

Prickly Acacia Description

Prickly Acacia Identification

Prickly acacia is a thorny shrub or small tree growing from 4–5 m to occasionally 10 m tall. The plants are distinct with fern-like leaves, a pair of stout thorns (1–5 cm long) and pods.

Young shrubs form dense thorny thickets and mature plants are usually single stemmed with spreading branches that have lost their thorns. The bark on saplings has a tinge of orange and/or green. Older trees have dark, rough bark.

The ball-shaped flowers are golden-yellow and about 1 cm across. The flowers grow in a group of two to six on a stem. The flat pods are 10–15 cm in length and turn grey when ripe.

Prickly Acacia Control

Controlling Prickly Acacia

Prickly Acacia is a weed of national significance and is identified as being invasive, having the potential for widespread environmental, social and economical damage. Landowner’s and land managers at all levels are responsible for actively managing this weed.

For best results use Starane Advanced for seedling and young plants up to 2 m tall at the rate of 450 mL/100 L of water. For best results add Uptake™ Spraying Oil.

Consult Tropical Weeds Research Centre, Charters Towers, for specific advice on application.

When treating with Access™ Herbicide as a basal bark application (plants with stems up to 5 cm basal diameter), use the 1 L/60 L of diesel rate.

Herbicides for Control of Prickly acacia

Method of application Rate* State
Access™ Herbicide Basal bark and Cut stump 1:60 with diesel distillate
Starane™ Advanced Herbicide Basal bark and cut stump 900 mL/100 L of diesel distillate All
Garlon™ 600 Herbicide
Basal bark and cut stump 1:120 with diesel distillate All
Starane Advanced Foliar spray 450 mL/100 L water + Uptake™ All
Vigilant™ II Herbicide Cut stump Apply neat: 3–5 mm layer All

#Note: Preferred product option in bold. *Consult label for details of growth stage and use, especially where range of rates is given.

Treatment Timing

Timing for Prickly Acacia Control

Treatment should only be carried out when plants are actively growing. Do not treat during hot, dry summer periods.

PRODUCT Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug
Statane Advanced
Best time to spray/treat
Can spray/treat
if conditions are suitable
Do not spray/treat