R-selected
Guides
Cactoblastis cactorum
cactus moth, South American cactus moth, nopal moth
Cactoblastis cactorum is a pyralid moth native to South America that has become globally significant both as a biological control agent and an invasive pest. In its native range, natural predators and parasitoids limit population growth. The species was deliberately introduced to Australia in 1925 for control of invasive Opuntia cacti, achieving dramatic success that inspired further introductions to South Africa, the Caribbean, and elsewhere. Following Caribbean establishment in the 1950s, the moth spread naturally and through human activity to the southeastern United States by 1989, where it now threatens native cactus species and the ornamental cactus industry. The moth exhibits r-selected life history traits including high fecundity, short adult lifespan, and strong dispersal ability.