Rotundo, G. 1975a La discriminazione dierodiagnostica negli Pseudococcidi. (Homoptera: Coccoidea). [Serum diagnostic discrimination in pseudococcids].. Bollettino del Laboratorio di Entomologia Agraria 'Filippo Silvestri'. Portici 32: 3-9.

Notes: Examined Planococcus citri, Pseudococcus obscurus, Fragilis and adonidum by double immunodiffusion; each species presents a pattern of reaction; immunological differences agree with morphological divergencies.