Questions about scale insects (Coccoidea)? Check out ScaleNet, a repository of information about the more than 7000 species of these plant pests. As reported by the ARS, Douglass and Gary Miller, creators of the site, are considered experts on the subject, and often consulted if species are found that are suspected to be invasive. You can also read the full article, recently published in the magazine Agricultural Research. There are currently at least 253 invasive scale insect species residing in the U.S.