Portillo Martínez, L. 1993 Producción de cochinilla del nopal con tres diferentes densidades de población. [Production of the prickly pear cochineal with three different population densities.]. Nakari 4(2): 25-34.

Notes: Results indicate that there are no differencies among the three population densities of Dactylopius coccus with respect to the quantity of cochineal produced. There is a difference in the average dry weight showing that the carminic acid content is constantly maintained without regard to the weight of the cochineal adults nor their size.