الفهرس 
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Abstract
The present study was conducted at the experimental farm at Sakha Agriculture Research station, Kafr El-Sheikh during two successive Faba bean and soybean growing seasons, 2010/2011and 2011/2012, to study the seasonal abundance of faba bean leaf miner, Liriomyza. trifolii (Burgess), aphids, Aphis spp and jassids Empoasca spp on five faba bean cultivars. Also Melanagromyza sojae and Spodoptera littoralis on three soybean cultivars. the relative susceptibility of faba bean and soybean cultivars to infestation, their relation to certain weather factors (weekly means of temperature, relative humidity, wind velocity and Rain fall). and to study the relationship between chemical components of faba bean varieties and insect pests infestation, also, relationship between morphological characters of soybean varieties and insect infestation.
Results showed that Liriomyza trifolii generally infested five faba bean cultivars (Sakha 1, Sakha 2, Sakha 4, Giza 843 and Giza 40) throughout tow seasons Also, Liriomyza trifolii had three peaks for mines and larvae in 2010/2011 which was higher than 2011/2012 season on five faba bean cultivars .
The highest average number of Liriomyza trifolii (Burgess) was recorded on Giza 40 variety which had high C. protein (20.72%), acidity (0.89%) chlorophyll (45ppm) and low silica (2.41)and Fe (18.95ppm). with average number of 23.41 and 4.57 larvae/20 leaflets, followed by Giza 843variety (17.82 and 3.28 larvae/20 leaflets) during the successive seasons, respectivly.
On the other hand, showed that the highest average number of Aphis spp. was recorded on Sakha 1 variety with an average number of 9.25±0.02 and 3.71±0.10 indiv/5 plants. while Sakha 4 variety received the lowest number of aphids with mean 1.9±0.40 and 0.92±0.025 indiv/5 plants during the two successive seasons, respectively .
The highest average number of Empoasca sp was recorded on Sakha1 variety with an average number of 100.25±2.13 and 86.21±2.3 indiv/5 plants. While lowest variety infested was Sakha2 (66.16±1.4 and 57.85±1.5 indiv/5 plants). during two successive seasons, respectively.
Statistical analysis revealed significant differences among faba bean varieties and the average number of Aphis spp and Empoasca spp during the two seasons of study .
The results showed insignificantly or significantly positive relationship among varieties contents from T, carbohydrates T. lipids, Fe, Mn ppm, with Aphis spp, Empoasca spp and Liriomyza trifolii while was negative relationship with T, carbohydrates, T. lipids, silica, Fe, and Mn ppm.
Results showed that Melanagromyza sojae generally infested three soybean cultivars had three peaks for mines, larvae and pupae during both seasons population density of Melanagromyza sojae mines larvae and pupae in 2011 season was higher 2010 season on three soybean cultivars .
Concerning cotton leafworm, Spodoptera littoralis results showed that Giza 35, variety with low infestation by Spodoptera littoralis followed by Giza 21 and Giza 82 .
The results showed that positive and significantly between Melanagromyza sojae population densities and chlorophyll (ppm). while negative significantly between chlorophyll and Spodoptera littoralis of soybean variety Giza 35 in the two seasons .
Concern leaf hair density, positive insignificantly between leaf hair density on lower surface of soybean plants and infestation with Melanagromyza sojae and Spodoptera littoralis on Giza 35 and Giza 82 varieties . in the two seasons .