Body broadly oval to round; flat to slightly convex in lateral view; body yellow-green to yellow-brown, usually with small brown flecks scattered on dorsum; body turning brown with age; without an obvious wax covering; ovisac absent. Occurring on arboreal parts of plant. Males usually absent; eggs hatch within body of female.
Coccus hesperidum is similar to C. moestus De Lotto but differs by having the apices of the dorsal setae acute or slightly rounded (the apices are broadly rounded or clavate in C. moestus) and the dorsalsubmarginaltubular ducts are about the same size as the ventraltubular ducts (the dorsal ducts are conspicuously larger than the ventral ducts in C. moestus). Coccus hesperidum also is similar to C. viridis (Green) but differs by having the marginal setae weakly fimbriate or simple (these setae are broadly fimbriate in C. viridis) the multilocular pores are rare anterior of the vulvar segments (the multiloculars are abundant forward to segment 2 or 3 on C. viridis).
U.S. quarantine notes
This species was intercepted 718 times on a variety of hosts at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Albania, Algeria, Antigua and Barbuda, Argentina, Australia, Bangladesh, Bermuda, Bosnia and Herzegovina, Brazil, Bulgaria, Cambodia, Canada, Chile, China, Colombia, Costa Rica, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, France, Germany, Greece, Guam, Guatemala, Haiti, Hawaii, Honduras, India, Indonesia, Israel, Italy, Jamaica, Japan, Jordon, Lebanon, Mexico, Morocco, The Netherlands, New Caledonia, New Zealand, Nigeria, Panama, Peru, The Philippines, Portugal, Puerto Rico, Singapore, South Africa, South Korea, Spain, St. Lucia, Switzerland, Taiwan, Thailand, Trinidad and Tobago, Tunisia, Uganda, The United Arab Emirates, The United Kingdom of Great Britain and N. Ireland, The United States of America, Uruguay, and Vietnam. It is one of the most cosmopolitan and polyphagous species of all scale insects (WilliaWa1990); therefore older quarantine records are not given. ScaleNet includes hosts on over 120 plant families from 110+ countries and all zoogeographic regions worldwide. Two species of Coccus other than C. capparidis Green, C. hesperidum, C. longulus (Douglas), C. moestus De Lotto , 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 De Lotto (The Philippines, on Dimocarpus, Lansium and Synsepalum).