Two field experiments were carried out in Sids, Agricultural Research Station, Beni-Suef Governorate, Middle Egypt, throughout 1997/98 and 1998/99seasons. Area of half a feddan for each was cultivated with Giza 674 variety in every season. The first experiment; comprised four different planting dates at 15-days intervals; during October 7, October 21, November 7 and November 21, were applied. The second experiment; a systemic insecticide Gaucho (Imidacloprid) at four rates, 0.5, 1, 3 and 5 g / Kg seed weight, used to coat faba bean seeds before cultivation in each season. Weekly mean numbers of aphids per plant shoot and at final harvest the crop yields and its components were recorded.        The obtained results and conclusion can be summarized as follows: (1). In both 1997/98 and 1998/99 seasons, the sowing date applied to faba bean had a significant   effect on the population abundance of cowpea aphid. (2). The second (October 21) and third sowing dates (November 7), seems to be more efficient  time to avoidance high population of aphids and showing highest yields of faba beans. (3). Delaying-sowing date of faba bean during November 21 greatly reduced the seed yield of faba  bean by 75.58 %, 73.93 %; and as well as, when moving the sowing date earlier to October 7; the seed yield reduced by 24.04 % and 76.23 %, in both 1997/98 and 1998/99 seasons, respectively. (4). Pre-sowing seed treated with Gaucho (Imidacloprid, 70 % WSP), at a rate 3 g / Kg seed weight was superior performance against cowpea aphid throughout 12-weeks after sowing, it gave over 80 % reduction in aphid populations and significantly improved plant stand which  resultant a significantly increase in seed yield by 181.85 % over control