Snap bean (Phaseolus vulgaris L.) is one of the most important exporting vegetable crops in Egypt. The experiment was done for two Nili seasons 2014 and 2015 in split plot design. Main plots were assigned to sowing dates and the sub plots were irrigation scheduling treatments. This study aims to investigate the effect of three sowing dates (1st, 16th of August and 1st of September); irrigation scheduling regime by using cumulative pan evaporation C.P.E. from Class A Pan evaporation ( 1.0, 0.8 and 0.6 C.P.E. ) on the population fluctuations of pisum aphid, Acyrthosiphon pisum Harris and growth parameters of snap bean. Results showed that the combination of third sowing date and irrigation at 0.8 C.P.E. (about 18-21 days irrigation interval) gave a low density of A. pisum comparing by the first and second sowing dates; highest averages of fresh pod yield (10196 and 10482 kg ∕ha in 2014 and 2015, respectively) as well as it achieved the greatest net farm income (28653 L.E. ha-1 ) for the third date comparing by anther two dates.