The non-native invasive plant species have been matter of national concern and has caused heavy impact on the expenditure of the federal as well as state government. The prime goals of the policies drawn by the government for the environment and agriculture development, includes prevention and management of invasive species. The mere management of invasive non-native weeds in Australian ecosystem causes an annual expenditure of about $ 4 billion. While the land clearing is prime threat of Australian biodiversity, weeds is the second largest menace. The 220 noxious weeds as recognised by the law were introduced in the country intentionally.
The threat of invasive species is a matter of great concern mainly because it is a continuous process. It causes threat to the precious environment, agriculture or other individual resources by harming it. They put huge pressure on the land’s biodiversity by spoiling soil and water. The local plants, crops as well as animals that consume these invasive species get adversely affected. It occupies the agricultural land and damage crops causing loss of millions of wealth. Weeds are the threat not only to the environment but also the industries of primary production. Weeds tend to dislocate the local plant classes and significantly degrade the quality of land as well as productivity of forests and farms. It also changes the naturally occurring biodiversity and ecological balance of the groups. These drastic changes in the environment cause threats for the survival of various other animals and plants. Weeds contest for the resources like land space, sunlight and nutrients from soil with the local plants.