Prickly pears in Australia
Encyclopedia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
.
Prickly pears (mostly Opuntia stricta
Opuntia stricta
Opuntia stricta is a species of cactus from southern North America, Central America, the Caribbean, and northern South America. Common names include Erect Prickly Pear and Nopal Estricto ....
) were imported into Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
in the 19th century for use as a natural agricultural fence and in an attempt to establish a cochineal
Cochineal
The cochineal is a scale insect in the suborder Sternorrhyncha, from which the crimson-colour dye carmine is derived. A primarily sessile parasite native to tropical and subtropical South America and Mexico, this insect lives on cacti from the genus Opuntia, feeding on plant moisture and...
dye industry. They quickly became a widespread invasive species
Invasive species
"Invasive species", or invasive exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats, with several definitions....
, rendering 40000 square kilometre of farming land unproductive. The moth Cactoblastis cactorum
Cactoblastis cactorum
Cactoblastis cactorum, commonly known as the Cactus Moth, South American Cactus Moth, or Nopal Moth, is native to Argentina, Paraguay, Uruguay, and southern Brazil. It is one of five species in the genus Cactoblastis that lives in South America...
from South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...
, whose larvae eat prickly pear, was introduced in 1925 and almost wiped out the population. This case is sometimes cited as an example of successful biological pest control
Biological pest control
Biological control of pests in agriculture is a method of controlling pests that relies on predation, parasitism, herbivory, or other natural mechanisms...
.
There is a monument
Monument
A monument is a type of structure either explicitly created to commemorate a person or important event or which has become important to a social group as a part of their remembrance of historic times or cultural heritage, or simply as an example of historic architecture...
to the Cactoblastis cactorum in Dalby, Queensland
Dalby, Queensland
Dalby is a town in the Darling Downs region of Queensland, Australia, and is located approximately west of the state capital, Brisbane, at the junction of the Warrego, Moonie and Bunya Highways. Dalby is the administrative centre of the Western Downs Region and the centre of Australia's richest...
commemorating the eradication of the prickly pear in the region.
See also
- Invasive species in AustraliaInvasive species in AustraliaInvasive species are a serious threat to the native biodiversity of Australia and are an ongoing cost to Australian agriculture.Management and the prevention of the introduction of new invasive species are key environmental and agricultural policy issues for the Australian federal and state...
- Conservation in AustraliaConservation in AustraliaConservation in Australia is an issue of state and federal policy. Australia is one of the most biologically diverse countries in the world, with a large portion of species endemic to Australia...
- Agriculture in AustraliaAgriculture in AustraliaAustralia is a major agricultural producer and exporter. Agriculture and its closely related sectors earn $155 billion-a-year for a 12% share of GDP. Australian farmers and graziers own 135,996 farms, covering 61% of Australia’s landmass. There is a mix of irrigation and dry-land farming...
External links
- Prickly Pear photograph album 1926-1933 digitised and held by State Library of QueenslandState Library of QueenslandThe State Library of Queensland is a large public library provided to the people of the State of Queensland, Australia, by the state government. Its legislative basis is provided by the Queensland Libraries Act 1988...
- Prickly pears in Australia at the Australian Weeds Committee
- History of prickly pear in Australia - from a New South Wales' perspective