Effect of Intercropping Three Faba Bean Varieties with Sugar Beet Plants on Piercing Sucking Insect Pests and Associated Natural Enemies Under Ridge Space and Seedling Rates in Relation Crop Yield.

Field experiment were conducted at Gemmiza Agricultural research Station, El Gharbia Governorate, Egypt, in 2014/2015and 2015/2016 seasons to study the effect of intercropping faba bean (Vicia faba L.) with sugar beet (Beta vulgaris L.) at different ridge width 60, 90 and 120 cm and seedling rats on the population densities of piercing sucking insect pests and their effect on the productivity of both crops and estimate the economic return. 
Results was indicated that the intercropping of broad bean at 60cm ridge space with sugar beet harbored the lowest piercing sucking pest infestations. However, Giza 3 improve at 120 cm ridge space was received the highest infestation.  On the other hand, Giza 716 was infested by highest infestation at 37.5% seed rates when intercropping with sugar beet. The lost infestation was recorded on sugar beet + Giza 3 improve with 12.5% seed rates.
Statistical analysis was showed the intercropping faba been with sugar beet on different ridge width significantly affected on sugar beet yield and yield components. Increasing sugar beet root length and purity % by planting on 60 cm ridge width, compared to 90 and 120 cm. On the other hand, root diameter, root fresh weight, top fresh weight, root yield/fed, top yield/fed T.S.S and sucrose were significantly increased by increasing ridge width from 60 to 120 cm. The effect of ridge width on faba bean traits revealed that increasing ridge width from 60 cm to 120 cm reduced plant height only of faba bean. On the other hand, number of pods/ plant, seeds/plant, weight of 100 seeds and grain yield /fed ardab were increased by increasing ridge width from 60 cm to 120 cm , while Protein content% was not affected by ridge width. Increasing seeding rates from 12.5 % to 37.5 % increased plant height and straw yield/ fed. The differences among faba bean varieties indicated that only plant height and number of seeds/ plant were affected by faba bean varieties. On the other hand, all the other characters were affected by faba bean varieties. highest values of Land equivalent ratio (LER), Farmer^,s benefit (Total return of intercropping culture , Net profit fed^-1 ) and Monetary advantage index (MAI) compared with other treatments  . It could be concluded that intercropping 100 % sugar beet + 37.5 % faba bean Giza 3 improve cultivar (52500 plants / fed) on ridge width 120 cm gave the greatest values for all treatments which gave the maximum yield benefits and least competition between component crops compared with other treatments  .