Apparently very similar in appearance to Florida wax scale which is described as follows: Body oval or rectangular; convex in lateral view in old females, nearly flat in young females; body reddish brown; with a thick wax covering; eggs laid in chamber under body of adult; ovisac absent. Test: Wet wax rectangular to oval in dorsal view, hemispherical laterally, without horn, grayish to pinkish white, with large marginal flange in older females absent or small in young females, not hiding lateral filaments, without plates and nuclei. Dry wax with filaments as follows: cephalic filament appearing trifurcate, with acute apices; anterolateral and mediolateral filaments simple; posterolateral filaments bifurcate; caudal filaments with weakly divided, bifurcate apices; dorsal dry wax of first and second instars forming small central cap, not surrounded by nucleus; dorsal dry wax not tilted. Stigmatic wax bands present near both spiracles, anterior band directed dorsally, filamentous wax confined to stigmatic areas. On stems.
Ceroplastes japonicus is similar to C. floridensis by having a submarginal row of tubular ducts, no dorsomedial clear area, and tubular ducts with the inner filament expanded. Ceroplastes japonicus differs by having the anterior and posterior clusters of stigmatic setae contiguous (these are separated by thin marginal setae in C. floridensis) and more stigmatic setae (about 130 on each side of body; about 28 on each side of body on C. floridensis ).
U.S. quarantine notes
This species was intercepted 29 times on a variety of hosts at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Armenia, France, Georgia, Germany, Greece, Italy, Russia, South Korea, Thailand, Turkey and Yugoslavia. We also have examined specimens taken in quarantine from China (Paeonia); France (Laurus); Hong Kong (unknown plant); Italy (Laurus); Japan (Aralia, Aspidistra, Azalea, Buxus, Camellia, Cercidophyllum, Chaenomeles, Citrus, Cotoneaster, Diospyros, Euonymus, Eurya, Fatsia, Ilex, Ophiopogon, Paeonia, Pittosporum, Prunus, Punica, Pyrus, Rhododendron, Tamarix, Taxus); Portugal (Diospyros); Sicily (Laurus). ScaleNet includes hosts on over 25 plant families from the Oriental and Palaearctic regions. One species of Ceroplastes other than C. ceriferus (Fabricius), C. cirripediformis Comstock, C. floridensis Comstock, C. japonicus, C. rubens Maskell, C. rusci (Linneaus), C. sinensis Del Guercio and C. stellifer (Westwood) has been intercepted at a U. S. port-of-entry, C. cistudiformis Cockerell (Mexico, on Punica).