Cactoblastis cactorum, commonly known as the cactus moth, is a small, grayish moth native to South America. It is well-known for its larvae, which feed on cacti, particularly the prickly pear. The species has notable orange and black banded larvae and a significant impact on cactus populations, making it both a biological control agent and an invasive pest.

Cactoblastis cactorum, commonly known as the cactus moth, is native to South America. It is primarily found in countries such as Argentina, Paraguay, Uruguay, and parts of Brazil.

Cactoblastis cactorum typically inhabits arid and semi-arid regions where cacti are prevalent. These areas are characterized by warm temperatures and low rainfall, suitable for the growth of the prickly pear cacti (Opuntia species) which the moth larvae feed on.

The cactus moth plays a specific ecological role as a herbivore, specializing in feeding on various species of prickly pear cacti. The larvae burrow into the pads of the cactus, which can lead to significant damage or even death of the plant. This specialization makes the moth an effective biological control agent in regions where prickly pear cacti are invasive.