Life Cycle and Larval Survival Rate of the Redspotted Longicorn Beetle, Eupromus ruber (Dalman) (Coleoptera:Cerambycidae)

Abstract

The larvae of Eupromus ruber (Dalman) were regularly collected from host trees, Persea thunbergii (Sieb, et Zucc.) Kostermans in Shimoda, Shizuoka Pref. in order to clarify the life cycle and the survival rate from egg stage to adult of this cerambycid. Female adults laid several eggs on oviposition sites in summer. The incubation period of eggs was 7–10 days under natural conditions. Larvae pupated, and adults eclosed in the summer after next. These callow adults stayed in the host trees until the following May. A 3 year life cycle was common. There were variations in developmental rates of the larvae hatched from the same oviposition sites, and some individuals seemed to require 4 or more years for 1 generation. The mortalities of the larval period were relatively high during the 1st and 2nd instars and from the last instar to adult eclosion, but low from the 3rd to the last instars. It was calculated that about 20% of eggs laid grew to adult stage, but less than that was estimated to actually appear on host tree. © 1991, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.