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Abstract
The present work was carried out to determine the biological effect of gamma irradiation, entomopathogenic nematodes and their combination on the greater wax moth, Galleria mellonella.
The obtained results can be summarized as follows:
A. Biological effect of gamma irradiation on full grown pupae:
1. A negative relationship between radiation doses and number of eggs deposited by treated females mated with normal or treated males. When unirradiated females, mated with irradiated males, laid less number of eggs comparing with the control, however there was no significant reduction between treatments.
2. The incubation period of eggs had a positive correlation with the applied doses to both male and female irradiated as full grown pupae; increasing the dose lead to increasing period. In contrast, there was adverse relationship between the applied radiation doses and the percentage of egg hatchability.
3. The radiation dose levels 160 and 260 Gy were considered as the complete sterilizing doses for females and males, respectively.
4. The larval duration of F1 generation resulted from irradiated males and/or female increased as the irradiated dose increased as compared with the control.
5. Percent of pupation of F1was reduced as the radiation dose increased rather than male and / or female was treated. While, the pupal duration was increased with increasing the dose.
6. Adults emergence showed adverse reduction to the dose increase; the higher the dose, the lower was in the percentage of adult emergence in F1 generation of irradiated males and/or females.
7. The sex ratio among the progeny of irradiated parent (male and/or female ) was in favor of males.