Abstract: 【Aim】 This study aims to determine the effects of feeding on diets containing components of different plants on the growth and development and detoxification enzyme activitiesof Pagiophloeus
tsushimanus larvae, so as to explore the roles of host plants on the feeding habits and resistance capabilities of P. tsushimanus.【Methods】 Three semi-artificial diets were prepared separately by using twig powders of three plant species of Lauraceae (Cinnamomum camphora, Cinnamomum chekiangensis, and Phoebe chekiangensis) as the plant components, and fed to P. tsushimanus larvae. The developmental duration, body weight, mortality rate, and pupation rate of the larvae fed on the semi-artificial diets were measured. After the 4th instar larvae were subjected to starvation for 12 h and then fed on the three semi-artificial diets, the temporal changes in the activities of detoxification enzymes［glutathione S-transferase (GST), carboxylesterase (CarE) and acetylcholinesterase (AChE)］ were measured. 【Results】 There were significant differences in the developmental duration of P. tsushimanus larvae fed on the semi-artificial diets containing different plant components. The developmental duration of P. tsushimanus larvae fed on the semi-artificial diet containing C. camphora components was the shortest (100.13 d), while that of larvae fed on the semi-artificial diet containing P. chekiangensis components was the longest (123.33 d). In the larval stage, the mortality rate of P. tsushimanus larvae
fed on the semi-artificial diet containing C. chekiangensis components was the highest (41.67%), while that of larvae fed on the semi-artificial diet containing C. camphora components was the lowest (10.00%). The pupation rate of P. tsushimanus larvae fed on the semiartificial diet containing C. camphora components was the highest (87.32%). The growth rate of larvae fed on the semi-artificial diet containing C. camphora components was also significantly higher than that of larvae fed on the semi-artificial diet containing C. chekiangensis or P. chekiangensis components. Meanwhile, there was no significant difference in the activities of GST and AChE between the larvae fed on the semi-artificial diets containing different plant components after being subjected to starvation for 12 h (P>0.05), while the CarE activity in the larvae fed on the semi-artificial diet containing C. camphora components increased significantly at 60 h after feeding. 【Conclusion】 The results suggest that P. tsushimanus has strong physiological adaptability to its natural host plant C. camphora, which may be related to its host specificity. Meanwhile, P. tsushimanus can adapt to different host plants by adjusting its growth and metabolic detoxification.

Key words: Pagiophloeus tsushimanus, semi-artificial diet, growth and development; detoxification enzymes, physiological adaptability