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Prickly pears -LRB- Genus Opuntia -RRB- are an invasive plant species in Australia .. Opuntia. Opuntia. invasive plant. invasive plant. Australia. Australia. Prickly pears -LRB- mostly Opuntia stricta -RRB- were imported into Australia in the 19th century for use as a natural agricultural fence and in an attempt to establish a cochineal dye industry .. Opuntia. Opuntia. Australia. Australia. Opuntia stricta. Opuntia stricta. cochineal. cochineal. dye. dye. Many of these , especially the Tiger Pear , quickly became widespread invasive species , rendering 40000 km2 of farming land unproductive .. Tiger Pear. Tiger Pear. invasive species. invasive species. The moth Cactoblastis cactorum from South America , whose larvae eat prickly pear , was introduced in 1925 and almost wiped out the population .. Cactoblastis cactorum. Cactoblastis cactorum. South America. South America. This case is often cited as an example of successful biological pest control .. biological pest control. biological pest control. In the early days it was used as a clothing dye .. dye. dye. There is a monument to the Cactoblastis cactorum in Dalby , Queensland commemorating the eradication of the prickly pear in the region .. Cactoblastis cactorum. Cactoblastis cactorum. monument. monument. Dalby. Dalby, Queensland. Queensland. Queensland. The Cactoblastis Memorial Hall in Boonarga , Queensland , also commemorating the eradication .. Queensland. Queensland. Cactoblastis Memorial Hall. Cactoblastis Memorial Hall. Boonarga. Boonarga, Queensland