Opuntia-specialist
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.
Melitara
Pricklypear Borers
Melitara is a genus of snout moths (Pyralidae: Phycitinae) established by Francis Walker in 1863. Species in this genus are specialist herbivores of cacti, particularly Opuntia species, with larvae that bore into cactus pads and stems. The genus is taxonomically contentious, with some sources treating it as a synonym of Zophodia while others retain it as valid. Melitara species serve as hosts for parasitoid wasps in the family Braconidae, and have been studied in the context of biological control of invasive cacti and as potential competitors to the invasive South American cactus moth Cactoblastis cactorum.
Melitara dentata
Blue Cactus Borer, North American Cactus Moth
A pyralid moth native to western North America, ranging from Alberta to southern Arizona and central Texas, with introduced populations in Hawaii. Adults have a wingspan of 32–50 mm. The species has one generation per year and is specialized on Opuntia cacti as larval hosts.
Melitara texana
Texas snout moth
Melitara texana is a species of snout moth in the family Pyralidae, described by Herbert H. Neunzig in 1997. The species is known from southern Texas and adjacent Mexico. Its larvae are specialized feeders on Opuntia lindheimeri var. lindheimeri, a prickly pear cactus species.