Leguminous aphid, Aphis craccivora (Koch) and jassids, Empoasca spp. are serious insect pests attacking faba bean crop. Therefore, the present work was carried out to study the population density of the two insect species in relation to associated predators (Chrysoperia carnea Steph., Coccinella undecimpunctata L., Paederus alfierii (Koch) and Scymnus spp.) and some related climatic factors (temperature, relative humidity and wind speed). The obtained results cleared that aphid populations were higher than those of jassids and had three peaks of abundance during January, February and March in both seasons. The three climatic factors affected aphids insignificantly in the two seasons except for relative humidity which affected it highly significantly. On the other hand, the predators affected aphids highly significantly in 1991/92 season and significantly in 1992/93. Concerning jassids, three peaks also occurred in the two seasons. The population was affected insignificantly with the three climatic fac­tors. The predators affected jassid populations significantly in the first season and insignificantly in the second one. The joint effect of the four pronounced on aphids than on Jassids during the two seasons, since these factors were responsible for 74.60 and 50.83% of changes in aphid populations and for 37.1 and 21.7% of changes in jassids during 1991/92 and 1992/93 seasons, respectively. The populations of both aphids and jassids as well as associated predators were relatively higher in the second season than in the first one_ Scymnus spp. was the most prevalent in both seasons. The results also showed three overlapping generations of both aphids and jassids during the inspection period in the two seasons.