Figure 14.4 The prickly pear cactus in Australia. Following the import of the cactus from South America to Australia, its numbers increased dramatically. (a) To reduce the abundance of the cactus, the cactus moth was introduced to Australia from South America. (b) A site in Queensland, Australia, in 1926 prior to the introduction of the moth. (c) The same site three years after the introduction of the moth.

Photos courtesy of (a) USDA/ARS, photographer Peggy Greb; (b) The Alan Fletcher Research Station, Department of Lands, Queensland; and (c) the Queensland Government.