(100,150,200,250 and 300 Gy) and the combined effect of them and essential oil were tested.
Results: Comparing the estimated LC10, LC50, LC90 values of present investigation of mentioned essential oils indicated that essential oils of Origanum majorana is more toxic to G. mellonella than the other essential oil of Cymbopogon proximus, then were selected in combined with the dose of 100 Gy in the shared experience. It also found that the percentage of pupation, emergence and sex ratio decreased with increasing concentration of both extracts -The lack of the number of eggs and the percentage of hatched eggs increase with the increase the radiation
The present investigation was carried out to study the effect of LC 50 of the entomopathogenic fungi (EPF), Paecilomyces lilacinus and Beauveria bassiana, on larval mortality of the greater wax moth (GWM), Galleria mellonella L., under laboratory conditions and also to study the effect of different doses of gamma irradiation (70, 100, 125, and 150 Gy), separately or combined with the LC 50 of the isolates of the EPF, B. bassiana, and P. lilacinus, on the second-instar larvae of G. mellonella larval mortality. The combined treatment of gamma irradiation and EPF increased the larval mortality rates than that at each treatment alone. The highest percentage of larval mortality was 78 and 84%, with 125 Gy + B. bassiana in the case of F 1 male and F 1 female, respectively. According to the obtained results, the gamma irradiation increased the pathogenicity of the fungi against the tested larvae. The combination between the two control tools may provide satisfactory control of the insect-pest, especially, in the storage.
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