Portillo Martínez, L. 1995 Los hospederos de las cochinillas del carmin (Dactylopius spp.) y algunos consideraciones sobre su aprovechamiento. [Hosts of the carmine cochineal (Dactylopius spp.) and considerations for its improvement.]. [Knowledge and Improvement of the Prickly Pear. Proceedings of the 6th National Congress and 4th International Congress.] [University of Guadalajara] Universidad de Guadalajara Guadalajara, Jalisco, Mexico 308 pp.

Notes: [Original title of conference proceedings: Conocimiento y Aprovechamiento del Nopal. Memorias del 6to Congreso Nacional y 4to Congreso Internacional.] Dactylopius ceylonicus, D. coccus, D. confusus, D. opuntiae and D. tomentosus are discussed.