David, A.L., & Muthukrishnan, T.S. 1953 The prickly pear cochineal: observations on its natural hosts and enemies in south India.. Indian Journal of Entomology 15: 219-224.

Notes: Dactylopius coccus, D. indicus and D. tomentosus is discussed on Opuntia spp. Nopalea cochinillifera is identified as an alternate host for D. tomentosus and two coccinellid predators have been found on D. tomentosus.