关键词:  樟叶蜂, 樟树, 温度, 发育历期, 发育速率, 发育起点温度, 有效积温

Abstract: 【Aim】 The camphor sawfly, Mesoneura rufonota, is an important leaf-feeding pest of the camphor tree, Cinnamonum campora. In this study the effects of temperature on the development and reproduction of M. rufonota were investigated so as to provide a foundation for the forecasting and integrated management of this pest. 【Methods】 The duration of different developmental stages, survival rate and reproduction of M. rufonota reared at different constant temperatures (19, 22, 25, 28 and 30℃) were measured and analyzed, the model fitting between the developmental rate and temperature was conducted, and the developmental threshold temperature and effective accumulated temperature were calculated by using the method of least squares. 【Results】 Within the constant temperatures ranging from 19 to 30℃, the average duration of various developmental stages of M. rufonota shortened as temperature rose gradually. This insect needed 34.62 d to complete a life cycle at 19℃, while needed 18.97 d at 30℃. The developmental rates in different stages were positively correlated with temperature, and the relationships between developmental rates and temperature all fitted the quadratic regression model. The developmental thresholds of egg, larva, pupa, adult and whole generation were 5.26, 3.22, 7.66, 8.24 and 5.11℃, respectively, while the effective accumulated temperatures were 65.58, 204.15, 121.94, 65.01 and 460.29 d·℃. The accumulative survival rates in different stages were decreased and the adult longevity shortened with increasing temperature. The fecundity was the highest at the temperatures ranged from 22 to 25℃ and the lowest at 30℃, indicating that higher or lower temperature inhibits oviposition of M. rufonota. 【Conclusion】 Temperature is a key factor affecting the development and reproduction of M. rufonota, and the optimum temperature range for its development and reproduction is from 22 to 25℃. These findings provide a scientific basis for the monitoring and integrated management of this pest.

Key words: Mesoneura rufonota, Cinnamomum campora, temperature, developmental duration, developmental rate, developmental threshold temperature, effective accumulated temperature