الفهرس 
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Abstract
The present experiments were carried out at the experimental farm of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate. The experiments were conducted on four faba bean varieties (Sakha 1, Sakha 4,Giza 843 and Misr 1) and on four soybean varieties (Crawford, Giza 111, Giza 21 and Giza 35) to evaluate the effect of different soybean varieties on the main piercing-sucking insect pests. In addition, Seeds of sakha 4 faba bean variety and Giza 111 soybean variety were sown in three consecutive dates at 30 days to study influence of planting dates on the main insect pests and their associated predatory insects during two seasons 2015/16 and 2016/2017. The purpose of the present study was to: 1- Survey of the main piercing-sucking insect pests attacking different varieties on leguminous crops (faba bean and soybean) and their associated predators. 2- Study the population density of the main piercing-sucking insect pests attacking different varieties on faba bean and Soybean crops and their associated predators. 3- Effect of different varieties on the population of the main piercing-sucking insect pests attacking faba bean and soybean crops and their associated predators. 4- Effect of different plantations on the population of the main piercing -sucking insect pests attacking faba bean and soybean crops and their associated predators. 5- Biological studies on the Green lacewings, chrysoperla carnea (Steph.) reared on the Green peach aphid, Myzus persicae (Sulzer) as preys under laboratory conditions. The results showed that:- 1. The cowpea aphid, Aphis craccivora (Koch) ranked the first category on different faba bean varities during the two successive seasons followed by the leafhoppers species Empoasca spp. came in the second category. Meanwhile, the cotton mealybug, P. solenopsis came in the last ranking. 2. The faba bean variety Sakha 4 attractived the highest seasonal average number of Aphis craccivora during the two seasons. 3. The faba bean variety Sakha 1 attractived the highest seasonal average number of the Green peach aphid, Myzus persicae (Sulzer) during the two seasons. 4. The faba bean variety Sakha 1 attractived the highest seasonal average number of the leafhoppers, Empoasca spp. during the two successive seasons. 5. The faba bean variety Sakha 1 attractived the highest seasonal average number of the green stink bug, Nezara viridula L. during the first season. While, the highest seasonal average number of N. viridula recorded in Sakha 4 variety during the second season. 6. The faba bean variety Sakha 4 attractived the highest seasonal average number of the cotton mealybug Phenacoccus solenopsis during the two successive seasons. 7. The soybean variety Giza 111 attractived the highest seasonal average number of the cotton aphid, Aphis gossypii Glove during the first season. While, the highest seasonal average number recorded in Crawford variety during the second season. 8. The soybean variety Crawford attractived the highest seasonal average number of the Whitefly, Bemisia tabaci, Empoasca spp. and N. viridula during the two successive seasons. 9. The Green lacewing, chrysoperla carnea was recorded the dominant predators followed by Coccinella undecimpunctata L. and Orius spp. on the different faba bean varieties during the two successive seasons. 10. November plantation attractived the highest total number of the main piercing – sucking insect pests and predators inhibiting sakha 4 faba bean variety followed by October plantation and December plantation during the two successive seasons. 11. C. carnae recorded the dominant predators followed by Scymnus spp. and C. undecimpunctata on the different soybean varieties during the two successive seasons. 12. June plantation attractived the highest total number of the main piercing – sucking insect pests and predators inhibiting Giza111 soybean variety in the two successive seasons. 13. The shortest developmental time of the three larval instars for C. carnea recorded on M. persicae which reared on faba bean followed by kidney bean then cowpea plants.