Abstract: 【Aim】 To understand the effects of exposure to 5 h LED light of different wavelengths in scotophase on the growth, development and reproduction of Spodoptera litura. 【Methods】 Various developmental stages of S. litura in treatment groups were exposed to LED light of different wavelengths ［red (620-625 nm), yellow (580-585 nm), blue (465-467 nm), green (520-523 nm) and white (composite) light］, respectively, for 5 h in scotophase, expressed as the photoperiods of 14L∶5R∶5D, 14L∶5Y∶5D, 14L∶5B∶5D, 14L∶5G∶5D and 14L∶5W∶5D, respectively, with those in the control group cultured under a photoperiod of 14L∶10D, and the egg hatching rate, pupation rate, adult eclosion rate, developmental duration and adult longevity were observed and calculated. Pupae were weighted and the number of eggs laid per female counted. 【Results】 Exposure to LED light of different wavelengths for 5 h in scotophase had no significant effect on the egg hatching rate, pupation rate, adult eclosion rate of S. litura. The egg duration of the yellow light group (4.0 d) was significantly prolonged as compared to that of the control (3.0 d), while the pupal duration of various treatment groups was significantly shortened as compared to that of the control, and the male pupal duration was significantly longer than the female pupal duration. The pupal weight of various treatment groups was reduced as compared to that of the control, but there was no significant difference in the pupal weight between female and male. The adult longevity of various treatment groups was extended as compared to that of the control. The male adult longevity of the red light group (18.4 d) was significantly longer than the female adult longevity of this group (15.0 d), and the pre-oviposition period of the red light group (3.0 d) was the shortest and the number of eggs laid per female (1 346.0 eggs) of this group was the highest. 【Conclusion】 Under certain conditions, 5 h LED light of different wavelengths in scotophase mainly affects the pupal duration, pupal weight and adult longevity of S. litura, but the effects vary with the wavelength.

Key words: Spodoptera litura, LED light, growth and development, reproduction, pupal weight, adult longevity