Treatment of nitrogen can be used as alternative method to chemical control against stored-product-insects. The aim of this study was to determine the effectiveness of modified atmospheres (MAs) based on high nitrogen (N₂) contents on infestation by immature stages of Ephestia cautellaandStegobium paniceum, major pests of date fruits, and their effect on the quality of date fruits. The tested MAs were 98% nitrogen gas (Oxygen 2%), in diverse exposure-times. The study found, the egg, larval, and pupal stages of E. cautella and S. paniceum responded significantly to MAs enriched by “N2" as exposure-time increased. Two days (48h) exposures of date fruits to nitrogen gas were adequate enough to complete suppression in adult emergence of E. cautella. While, 24 h exposure to N₂ gas was enough to suppress S. paniceum. Time and pest level were an influential factor that have a massive effect on the immature mortality percent and adult emergence of E. cautella and S. paniceum after exposure to N₂ gas. Furthermore, nitrogen gas did not effect on the quality of the date fruits.