This species was intercepted at U. S. ports-of-entry 6 times between 1995 and 2012, with specimens originating from Denmark, El Salvador, Italy, Mexico and The Netherlands. We also have examined specimens taken in quarantine from Japan (Agave, Crassula, succulent); Mexico (Chrysanthemum, Sedum); The Netherlands (Echeveria); South Africa (Euphorbia). ScaleNet lists hosts in 9 plant families. It is most commonly collected on Asteraceae and Crassulaceae. ScaleNet distribution records for P. defectus include Mexico and the The United States of America (California) in the Nearctic region, and France in Europe in the Palaearctic region. Several species of Phenacoccus other than P. defectus, P. franseriae Ferris , P. gossypii Townsend & Cockerell, P. hakeae Williams, P. helianthi (Cockerell), P. madeirensis Green, P. parvus Morrison, P. solani Ferris, P. solenopsis Tinsley and P. stelli (Brain) have been taken at U. S. ports-of-entry including: P. alleni McKenzie (Mexico, on Artemisia); P. avenae Borchsenius (Turkey, on Stachys); P. azaleae Kuwana (Japan, on azalea); P. graminicola Leonardi (New Zealand, on Feijoa); P. hurdi McKenzie (Mexico, on Dendranthema and Capsicum); P. indicus Avasthi & Shafee (Thailand, on Euphorbia); P. multicerarii Granara de Willink (Mexico, on unknown host); P. manihoti Matile-Ferrero (Central Africa and South America, on Manihot); P. nephelii Takahashi (Thailand, on Garcinia; Vietnam, on Nephelium); P. pergandei Cockerell (Japan and Korea, on Diospyros, Magnolia, Malus, Prunus, Punica, and Rhododendron); and P. persimplex Borchsenius (Kazakhstan, on Malus).