Abstract: 【Aim】To clarify the effects of ultraviolet radiation to the parasitized host pupa on the growth and development of the parasitoid Trichopria drosophilae, so as to provide a reference for the mass breeding of T. drosophilae. 【Methods】Three ultraviolet irradiation lamps, UVA, UVB and UVC, were used to irradiate the parasitized Drosophila melanogaster pupae in a dark box. The irradiation duration was 3, 6 and 9 h, respectively. The pupal mortality rate, egg-adult duration, adult emergence rate, sex ratio (female to male ratio), and longevity of T. drosophilae were observed and calculated. 【Results】Compared to the control, UVA irradiation showed no significant effects on the adult emergence rate, pupal mortality rate and female to male ratio of T. drosophilae. After UVB irradiation for 3, 6 and 9 h, and UVC irradiation for 3 and 9 h, the adult emergence rates of T. drosophilae decreased significantly and the pupal mortality rates increased significantly compared to the control. The female to male ratios of T. drosophilae irradiated by UVB for 3, 6 and 9 h were greater than 2.00. After UVA irradiation for 3 and 6 h, and UVC irradiation for 3, 6 and 9 h, the egg-female adult duration of T. drosophilae was significantly lower than that of the control. After UVC irradiation for 3, 6 and 9 h, the egg-male adult duration of T. drosophilae was significantly lower than that of the control. The female adult longevity of T. drosophilae raised with the increase of irradiation duration of UVA, but showed no significant difference between the UVA irradiation groups and the control. The female adult longevity in UVB irradiation for 6 h was significantly higher than that in the control. The male adult longevity of T. drosophilae in ultraviolet irradiation treatments was higher than that of the control, and the male adult longevity in UVA irradiation for 3 h, UVB irradiation for 6 h and UVC irradiation for 9 h exhibited significant difference from that in the control. 【Conclusion】Ultraviolet irradiation treatment on the parasitized D. melanogaster pupae can significantly affect the egg-adult duration and adult longevity of T. drosophilae. The results of this study provide a reference for the multiplication of natural enemy resources for biological control of Drosophila pests.

Key words: Trichopria drosophilae; Drosophila melanogaster, ultraviolet irradiation, growth and development, biological control