The purple scale, Lepidosaphes (= Cornuaspis) beckii Newman (Hemiptera: Diaspididae), is reported herein for first time on Pachycereus marginatus (D.) Britton & Rose (Cactaceae) and Myrtillocactus geometrizans (Mart. Ex Pfeiff.) (Cactaceae) in North-Central Mexico. The purple scale has been reported on plants representing 56 genera in 40 families and is distributed in various countries, including Mexico (García-Morales et al. 2016, http://scalenet.info/catalogue/Lepidosaphes%20beckii/). In Mexico, L. beckii has been reported in Ciudad de Mexico, Colima, Nayarit, Sinaloa and Veracruz in citrus-growing areas (Miller 1996, Proc. Entomol. Soc. Wash. 98: 68–86; García-Morales et al. 2016) and on ornamental and shade plants (García-Morales et al. 2016).

Pachycereus marginatus and M. geometrizans are endemic cactus species in Mexico. Both grow wild: P. marginatus in Colima, Chiapas, Ciudad de Mexico, Guanajuato, Guerrero, Hidalgo, Jalisco, México, Michoacan, Oaxaca, Puebla, Queretaro, San Luis Potosi, Tabasco, Tlaxcala, Veracruz, and Zacatecas states and M. geometrizans in Aguascalientes, Durango,...

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