| In order to understand the effects of 60Co-γ radiation on the development and reproduction of the adult Spodoptera frugiperda, 6 day old pupae were irradiated with different doses of 60Co-γ radiation to compare the differences on the adult emergence, wing deformity, longevity, egg production and offspring hatching rate of S. frugiperda in inbreeding population. Results showed that, emergence rate of adult S. frugiperda decreased gradually with the increase of irradiation dose, and emergence rate under 250 Gy, 350 Gy, 400 Gy and 500 Gy irradiation was significantly different from control group (91.7%), which decreased into 72.8%, 69.4%, 69.4% and 50.6%, respectively. The rate of wing deformity was highest at 400 Gy with a value of 25.6%,was no significantly different founded from control group. Longevity of both female and male adults decreased with increasing irradiation doses, and the longevity of both female and male adults in the control group was significantly higher than treatment groups with different doses (7 doses).Under treatment of 100 Gy, 200 Gy, 300 Gy and 500 Gy, daily survival rate of male adults was higher than female adults, while daily survival rate of female adults in 350 Gy, 400 Gy and control groups was higher than male adults. Compared with the control, there were significant differences in the number of females laying eggs, number of eggs laid by single females and hatching rate of their progeny in S. frugiperda population. By the treatment of 300~500 Gy radiation doses, there were no eggs produced by the parents, while under 100~250 Gy radiation doses, the number of eggs laid by the parents decreased significantly, and a small amount of eggs hatched in the 100 Gy treatment group. In this study, the radiation sterility dose of S. frugiperda was preliminarily investigated, which provided a scientific basis for the realization of sterility control technology of S. frugiperda in future. |
