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Environmental Weeds

Chemical control should be carried out by a licensed professional. Please contact the CCG office for more information.

Sydney Golden Wattle, Acacia longifolia

Sydney golden wattle is a highly invasive and destructive weedy wattle. It is spreading widely and readily into undisturbed bushland as well as degraded sites.  

Hand-pull seedlings; fell mature plants as close to ground as possible.

Basal bark – useful on stems less than 20cm diameter. Spray or paint lower 60cm of bark with herbicide, picloram/triclopyr, and penetrant (usually diesel)

Blackwood, Acacia melanoxylon

Blackwood is a highly invasive long-lived tree from the eastern states. It shades out and excludes local plants, dominating the vegetation. It suckers aggressively and coppices.

Hand pull seedlings; Basal bark – useful on stems less than 20cm diameter. Spray or paint lower 60cm of bark with herbicide, picloram/triclopyr, and penetrant (usually diesel)

Injection -50% glyphosate;

Victorian Tea Tree, Leptospermum laevigatum

The Victorian tea tree is weedy throughout the south west of WA as well as much of Australia and overseas. It is one of our most widespread weeds and a serious pest, especially in coastal areas. It is also allelopathic, which means it inhibits the growth of surrounding plant species.         

Cut trees and paint immediately with neat Glyphosate. Remove cut material to safe location as branches hold seed for a long period

Edible fig, Ficus carica

The edible fig is native to southwest Asia and is widely grown for its fruit. It is one of the first plants to be cultivated by humans, first recorded in southern Arabia in 2900BC

Hand-pull seedlings; Cut and paint large trees with 50% – 100% Glyphosate. Saw or lop tree as close to ground as possible. Essential to apply herbicide immediately to cut trunk with spray, brush, wick or squirt bottle

Sweet Pittosporum, Pittosporum undulatum

This sub-tropical tree is native to eastern Australia but has become a problem species both within and outside its natural range. Pittosporum is an evergreen tree, growing to around 14m and has bright orange fruit. Originally introduced to WA as a garden plant it is now prevalent in bushland areas. Pittosporum is very adaptable. It shades out other vegetation and changes the soil nutrient load with increased leaf litter. Seeds are spread through the activity of birds and animals and the dumping of garden waste. Small saplings can be hand pulled but the roots must dry out to prevent the plant re-rooting. Larger trees can be cut at ground level and the stump painted with 100% glyphosate. Adult Pittosporum trees are destroyed by fire.

Blackberry, Rubus sp.

Native to Europe, Blackberry is a Weed of National Significance. It spreads via seeds, suckers and the rooting of cane tips. The fruits are very attractive to birds and mammals, especially foxes, which may transport the seeds large distances. Large stands can quickly develop which become impenetrable over time. Blackberry can be controlled by spraying with metsulfuron in the dry summer months.

Arum Lily, Zantedeschia aethiopica

Introduced from South Africa as a garden plant, it has since become an established weed. It is found in creeks, ditches and damper areas of the SW area. It often produces large stands, giving almost 100% cover in the worst scenarios. The plant germinates in and starts flowering in early winter, then sets seed before dying back in the summer months. The plant spreads rapidly via it’s seeds which are very palatable to birds and through its vegetative root system.

Control is through the use of chlorsulfuron in winter and spring.

Bridal Creeper, Asparagus asparagoides

Bridal Creeper is an escaped garden plant, originally from parts of Africa and a Weed of National Significance. It is a highly invasive weed with a perennial root system which allows it to survive the long dry summers. It can often be seen along roadsides and in waste ground but it also invades native vegetation. A bio-control for bridal creeper was first released in Australia in 2000. Since then more than 700 releases of the rust fungus Puccinia myrsiphylli have taken place across the country. The rust fungus attacks leaves and stems, reducing the amount of green material available. It is having a positive impact on bridal creeper within the south west.

Dolichos pea, Dipogon lignosus

Originally from South Africa, Dolichos pea is a vigorous climber, seeds readily and can quickly smother native vegetation. The seeds are flung away from the plant as the pod splits and can lay dormant for many years before germinating. Mature plants are fire sensitive and seed viability is reduced following a fire. Large plants can be cut down and the stumps immediately painted with herbicide.

Tambooki grass, Hyparrhenia hirta

Tambooki is native to Africa and the Mediterranean. Once established Tambooki develops into a very thick, large tussock and can be recognised by its grey-green leaves. It can invade bushland, where it out-competes the local vegetation. Glyphosate is effective at controlling this weed.

Watsonia, Watsonia bulbilifera

Originally introduced as a garden ornamental, W. bulbilifera is now a serious weed of roadsides and disturbed areas. It grows readily in the south west, especially in damper areas where it crowds out native species.

The manual removal of watsonia can be effective where isolated plants occur within good bushland, otherwise chemical control with Glyphosate in spring is recommended. The dilution used will depend on the risk of off-target damage to native vegetation.

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