Permalink : http://hdl.handle.net/2115/90638

Serious damage caused by Aulacaspis yasumatsui Takagi was found on Cycas revoluta in the island of Amami-Ôsima, Japan, in 2022. This scale insect was originally described from Bangkok, Thailand, a locality possibly included in the range of natural distribution of the species; in recent years it has invaded many other areas of the world and is now known as a world-wide catastrophic pest of cycads under the name Cycad Aulacaspis Scale or CAS. In this article, the material of CAS forwarded to the author from various areas for identification has been re-examined for tracing the invasion into Amami-Ôsima.