A containment control plant is one that is abundant in suitable habitats in the region and the long term goal is to prevent these plants spreading to new areas or neighbouring properties. Because they are widespread the cost of eradication is considered too great to justify more rigorous methods of control.
The Strategy requires land occupiers to keep their property, boundary free of the plant pest if it is not present within a defined distance of their property.
Containment Control plant pests are banned from sale, propagation and distribution under the Biosecurity Act 1993.
Here is a list of Containment Control Plants:
BATHURST BUR (Xanthium spinosum)
Spiny, woody annual up to 1m tall.
Flowers/seeds: inconspicuous flowers, fruit are small oval burs covered with slender hooks.
Dispersal: animal wool/hair or clothing, machinery.
Problems: burs can downgrade wool, seeds and seedlings poisonous to livestock.
Control/disposal: dig out, spray.
BLACKBERRY (Rubus fruticosus agg)
Prickly scrambling perennial shrub with thorny stems up to 8m long, berries red black when ripe.
Flowers/seeds: white/pink flowers, berries green then red/black when mature.
Problems: grows to form thicket which can harbour pests such as rabbits, hares, possums. It can impede water flow, and thorns entangle sheep. Can be a fire hazard in forestry and urban areas.
Control/disposal: root rake, dig, spray.
GORSE (Ulex europaens)
Spiny perennial shrub up to 4m tall. Conspicuous yellow flowers.
Flowers/seeds: bright yellow flowers, followed by dark, oval seed pods with greenish brown seeds.
Dispersal: stock and machinery.
Problems: seed can be viable for up to 80 years in the soil. Gorse grows vigorously forming thickets which can trap woolly animals.
Control/disposal: combination of two or more of biological control, stock management, mechanical clearance, and sprays.
NODDING THISTLE (Carduus nutans)
Spiny leafed annual or biennial up to 1.5m tall, dark green upper leaves with irregular toothed lobes, flowers 'nod' at right angles to stem when mature.
Flowers/seeds: purplish mauve flowers, seeds are heavy and fall close to the plant.
Dispersal: stock, birds and machinery.
Problems: forms dense clumps which smothers pasture. Its presence in seed can reject the crop for export.
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