This species was intercepted 14 times at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Canada, and Mexico. Although P. gossypii has been identified hundreds of times from quarantine interceptions, these determinations are mostly misidentifications of P. madeirensis. ScaleNet lists the species from 13 families of host plants, and distribution records include Mexico and Florida in The United States of America, and countries in the Neotropical and Palaearctic zoogeographical regions. We suspect that many of these are based on misidentifications of P. madeirensis. Several species of Phenacoccus other than P.defectus Ferris, P. franseriae Ferris, P. gossypii, 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. However we suspect that at least some of them are in fact misidentifications of P. madeirensis, 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).