الفهرس 
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Abstract
The present experiments were carried out to study the population abundance of R. dominica on wheat, rice, corn and barley grains during two successive seasons 2014/15 and 2015/16 in Plant Protection Research Institute, Sakha Agricultural Research Station, Kafr El-Sheikh. In addition, study of influence of temperature, crop varieties and density of R. dominica on F1 progeny, damage percentage and weight loss percentage. Furthermore, biological activity of imidazed, essential oils and silica nanoparticles against adults of R. dominica. The obtained results of this study could be summarized in the following points: 1. Monthly average number of R. dominica attacking wheat grains: Results indicated that during the first year of 2014/15, R. dominica population fluctuation among year months, which initiated with average number of (49) individuals, then the insect numbers were significantly increased gradually during May (300 individuals), June (669 individuals) and reached its maximum during September with an average of 1704 individuals. Results indicated that the insect trend was the same in the second stored year (2015/16), but the pest number in the second year was higher than the numbers in the first year. Results indicated that R. dominica in both years of 2014/15 and 2015/16 were of active and recorded a major insect pest from May till October. 2. Monthly average number of R. dominica attacking rice grains: Results indicated that R. dominica initiated with low average number of 35 individuals in November. While, in the following months, the V. SUMMARY 113 number increased gradually from June (498 individuals) till September 2014/15 which reached peak with an average of 934 individuals. Data indicated that in the second year (2015/16), the insect pest initiated with average numbers of 43 individuals in November 2015 and increased gradually reaching its maximum of 1000 individuals in September 2016. 3. Monthly average number of R. dominica attacking corn grains: Results indicated that R. dominica population started in November 2014 with low average number reaching 30 individuals Meanwhile, the population increased in August 2015 (407 individuals) and recorded the highest numbers during October 2016 with an average of 847 individuals Results indicated that R. dominica population the highest numbers in September and October 2016 with an average of 800 and 920 individuals, respectively. On the other hand, the lowest population of the pest was observed in November 2015 with an average of 45 individuals. 4. Monthly average number of R. dominica attacking barley grains: Results indicated that during the first year of 2014/15, R. dominica population was initiated during November 2014 (50 individuals), then the population significantly increased gradually from December 2014 (114 individuals) till reached its the maximum in September 2015 (1904 individuals). Results indicated that the average number of pest population in the second year 2015/16 ranged between 58 and 2133 individuals during November 2015 and September 2016, respectively. V. SUMMARY 114 Results indicated that R. dominica population was present throughout the year on all plant materials, in storehouses. There was a low level of infestation in the beginning of the sampling, increasing gradually and reached the maximum in September of wheat, rice and barley storehouses, but reached the maximum in October of corn storehouses. 5. Effect of temperature, crop varieties and density of R.dominica on F1 progeny. Results indicated that numbers of F1 progeny increased significantly with increasing density (10, 20, 30 and 40 individuals) of R. dominica with compared check (without insect), but F1 progeny at 30˚C was higher than F1 progeny at 25˚C in all of rice varieties. Regarding to rice grains, Numbers of F1 progeny were 230.7, 227.7 and 90.3 individuals of Sakha 102, Giza 179 and Sakha 106 (at density 40 individuals and temperature 30˚C), respectively. Results indicated that numbers of F1 progeny increased significantly with increasing density (10, 20, 30 and 40 individuals) of R. dominica with compared check (without insect) in case of Sods 13 and Giza 171. Also, F1 progeny at 30˚C was higher than F1 progeny at 25˚C in all of wheat varieties. In respect to wheat grains, Numbers of F1 progeny were 248.7, 269.3 and 25 individuals of Sods 13, Gemeza 11and Giza 171 (at density 40 individuals and temperature 30˚C), respectively. Regarding to corn grains, F1 Progeny production increased with increasing parental density and were greater at 30˚C than at 25˚C with compared check (without insect). However, Numbers of F1 progeny were 60, 42.7 and 34.7 individuals of Shandwel 128, Sakha 10.