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A monument to the Cactoblastis cactorum moth at Dalby, Queensland. Prickly pear forest circa 1930 Infestation of O. tomentosa 2019, near Yelarbon, Queensland. Prickly pears (genus Opuntia) include a number of plant species that were introduced and have become invasive in Australia.
Opuntia aurantiaca, commonly known as tiger-pear, jointed cactus or jointed prickly-pear, is a species of cactus from South America. [2] The species occurs naturally in Argentina , Paraguay and Uruguay and is considered an invasive species in Africa and Australia .
Opuntia, commonly called the prickly pear cactus, is a genus of flowering plants in the cactus family Cactaceae, many known for their flavorful fruit and showy flowers. [1] Cacti are well-adapted to aridity; however, they are still vulnerable to alterations in precipitation and temperature driven by climate change. [ 2 ]
Cactoblastis cactorum, 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 inhabit South America, where many parasitoids, predators and pathogens control the expansion of the moths' population.
By 1862 prickly pear was growing in the Chinchilla district and spread rapidly in areas where land holdings were extensive and population relatively low. [1] Prickly pear was declared a noxious weed in Queensland in 1893. By 1900 approximately 10,000,000 acres (4,000,000 ha) were affected by prickly pear; an area which had extended to an ...
Part of a joint of a prickly pear cut open to show the pupa cases of a cactus weevil. From the Report of the Prickly-pear Travelling Commission. In 1912, Johnston was appointed chairman for a committee, the Prickly-Pear Travelling Commission, formed to investigate control measures for the prickly pear cactus.
In the early 1930s, when the amount of prickly pear was at its height, the government garnered enough support to be able to launch the bio-control project. In 1932 biological control in the form of, particularly, the cochineal and phycitid moth, was introduced and was highly effective. [2]
The moth Cactoblastis cactorum was introduced for the control of prickly pear, and the salvinia weevil Cyrtobagous salviniae for the control of aquatic weed Salvinia. More doubtful biological controls were the cane toad , which was introduced to control the sugar cane destroying cane beetle; instead the cane toad ate anything and everything ...