Salama, H.S., & Saleh, M.R. 1970 Distribution of the scale insect Pulvinaria psidii Maskell (Coccoidea) on orchard trees in relation to environmental factors.. Zeitschrift für Angewandte Entomologie 66: 380-385.

Notes: On Psidium guajava, two generations per year; distribution in different zones of the trees; seasonal variations.