Body oval; somewhat flattened dorsoventally; body green; legs red; covered by thin, white, mealy wax, probably with dark submedial bare spots on intersegmental areas of thorax and abdomen on dorsum, these areas forming 1 pair of dark longitudinal lines on dorsum; dorsalovisac covering entire dorsum; with 18 pairs of lateral wax filaments, posterior pairs longest about 1/4 or less of length of the body. Primarily occurring on foliage of host. Specimens in alcohol with 1 pair of dorsosubmedial dark lines on thorax and abdomen. Surface of lateral filaments rough.
This species was intercepted 423 times at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Canada, Costa Rica, Ecuador and Mexico. It has only recently been taken in quarantine. It is most frequently intercepted on herbs from Mexico. We also have examined specimens taken in quarantine from Mexico (Ocimum, Salvia). ScaleNet lists the species from Asteraceae, Euphorbiaceae and Zygophyllaceae, and distribution records include Mexico alone. Several species of Phenacoccus other than P.defectus Ferris, P. franseriae, 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).