Effect of sucrose levels in artificial diet on larval growth of cryptomeria bark borer, Semanotus japonicus (Lacordaire) (Coleoptera : Cerambycidae)

Larvae of the cryptomeria bark borer, Semanotus japonicus (Lacordaire) were reared on four artificial diets containing different sucrose levels of 1.9 %, 3.7%, 7.2%, and 13.4% per total weight of diet. Although there were no s ignificant differences in emergence rate, duration from insertion of hatchl ings to adult emergence, and elytral length of adult females between diet s ucrose levels, there was a significant difference in the elytral length of adult males. In diets containing 7.2% and 13.4% sucrose, the variances of e lytral length of adult males and females were small. In addition, in a diet containing 7.2% sucrose, the pupation rate of surviving larvae at 30 days after insertion was higher than that of the other diets. Therefore, a diet containing 7.2% sucrose seems to produce the best adult yield.