Pinnaspis aspidistrae (Signoret, 1869) (Homoptera, diaspididae) is an important citrus pest in Brazil. However, researches concerning this insect are scarce, particularly in Brazil. Therefore, studies were developed on the biology, predators and chemical control of this pest and also the effects of inseticides on Cyeloneda sanguinea (Linnaeus, 1763) which is frequent predator in orchards. The experiments were set at the Departament of Entomology of"Escola Superior de Agricultura Luiz de Queiroz", University of São Paulo, in Piracicaba, State of São Paulo, Brazil. Pinnaspis aspidistrae was reared on cucurbit hosts in the laboratory. The insecticides were tested on second and third nymphal instars of male and female of the scale which were kept on discs of citrus leaves in petri dishes and on pumpkins. The results were as follows: Pinnaspis aspidistrae is an oviparous species and presents amphigen reproduction; the mean longevity periods were 59,17 ± 0,92 days in the hot season and 71,37 ± 1,40 days in the cold season; the mean number of generation per year is 5,6; the coccinellid predators of the scale were Exoplectra sp., Scymnus sp. and a Stethorus sp., as well as the chrisopid Chrysopa sp.; as to the effects of chemicals on Cycloneda sanguinea mineral oil and carbophenothion presented low toxicity while abamectin was selective to this predators. Mineral oil, carbophenothion and abamectin were selective and dimethoate presented median toxicity to Cycloneda sanguinea, when the predator was placed on substratum previously treated with those chemicals; dimethoate and mixture of azinphos ethil, diazibon and carbophenothion with mineral oil were efficient to control the second and third nymphal instars of the pest regardless the sex; mineral oil, dimethoate and carbophenothion should be used on the integrated control of Pinnaspis aspidistrae not only because they provide a good control of the pest, but also because they preserve the coccinellid predators.