Coccus moestus is similar to C. hesperidum but differs by having the apices of the dorsal setae broadly rounded or clavate (the apices are pointed or slightly rounded in C. hesperidum) and the dorsalsubmarginaltubular ducts form a nearly continuous band (an irregular band on C. hesperidum) and are conspicuously larger than the ventral ducts (the dorsal ducts are about the same size or smaller than the ventraltubular ducts in C. hesperidum).
U.S. quarantine notes
This species was intercepted 14 times at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Costa Rica, Ecuador, Grenada, Honduras, Jamaica, and Puerto Rico. We have examined specimens taken in quarantine from Dominican Republic (Bactris); Jamaica (Artocarpus); Puerto Rico (Mangifera); Trinidad (Mangifera). We also have examined specimens taken in quarantine from Dominican Republic (Bactris); Jamaica (Artocarpus); Puerto Rico (Mangifera); Trinidad (Mangifera). ScaleNet includes hosts in 8 plant families. It is very commonly intercepted on Rambutan (Nephelium, Sapindaceae-Soapberry family). ScaleNet distribution records for C. moestus include the following zoogeographical regions: (Kenya, Tanzania, Zanzibar); : Bonin Islands (=Ogasawara-Gunto), Federated States of Micronesia (Caroline Islands, Truk Islands); Guam; Palau; Vanuatu (=New Hebrides), (various countries) and (China and Japan). Two species of Coccus other than C. capparidis Green, C. hesperidum Linnaeus, C. longulus (Douglas), C. moestus, C. pseudohesperidum (Cockerell) and C. viridis (Green) have been taken at U. S. ports-of-entry, C. alpinus De Lotto (Brazil, on Coffea) and C. celatus (The Philippines, on Dimocarpus, Lansium and Synsepalum).