Abstract: 【Aim】 This study aims to explore the effects of different radiation intensity and radiation duration of UV-B on the growth, development and fecundity of Sitobion avenae (Fabricius), and the interactions between radiation intensity and radiation duration. 【Methods】 Following different UV-B treatments (0.20 mW/cm² and 0.75 mW/cm² UV-B intensity, 3 h, 9 h and 15 h radiation duration, respectively) on S. avenae, the age-specific life table of S. avenae was established, the body weight was measured, and the mean relative growth rate, life table population parameters, fecundity parameters, age-specific survival rate and age-specific fecundity were calculated. 【Results】 The results revealed that in the same radiation duration, the intrinsic rate of increase (r_m), the net rate of increase (R₀) and fecundity (F) of S. avenae exposed to the high intensity UV-B (0.75 mW/cm²) were significantly lower than those exposed to the low intensity UVB (0.20 mW/cm²) and the control (UV-B absent), with the mortality increasing faster in a short period. Under the same intensity UV-B, the r_m, R₀  and F values of S. avenae also decreased significantly with the radiation durations, and the period of the fastest decline of the survival rate shifted to an earlier date. The UV-B intensity and the radiation duration had significant interactions. However, under low intensity UV-B for 3 h, the r_m, R₀ and F values of S. avenae were higher than those in the control. The MRGR of S. avenae exposed to high intensity UV-B for 15 h decreased significantly compared with the control, but were not significantly different among other treatments. The number of alataes increased when S. avenae was exposed to high intensity UV-B (0.75 mW/cm²) for long radiation duration (15 h) as compared with that in the control. 【Conclusion】 The growth and development of S. avenae are affected by the UV-B radiation and change with the intensity and duration of UV-B radiation, and these two factors (radiation intensity and duration) also have significant interactions.

Key words: Sitobion avenae, UV-B radiation, radiation intensity, radiation duration, life table, growth and development, fecundity