The maize, Zea mays (Lederer) (white single cross 2036 variety, Hytech company) is the first economically crop of the most important and widely grown as a staple food in many parts of the Egypt and world. Maize infested with fall armyworm (FAW), (Spodoptera frugiperda) is a species in the order: Lepidoptera, Fam: Noctuidae. The field experiment was conducted at Agricultural Research station "Qaha" in Qalyobia Governorate, Egypt. The paper aimed to study the impact of seeding dates on maize on infesting with FAW, Spodoptera frugiperda and the efficiency of some insecticides against FAW larvae. The statistical analysis illustrates that there are negative correlation relation (R= -0.36) between seedling dates, population and average temperature but these relations convert to become positive correlation relation with relative humidity and wind speed whereat  ( R= 0.12 and 0.08 ).  Specially seedling date 14^th and 27^th May 2021, data indicate that each maize plants are healthy and free from infestation with FAW larvae. While, other dates 15 July and 5 August, data illustrate that infestation was speedily spread on maize plants, wherever larvae attack all maize plants. On the other hand, In case of efficiency of insecticides on mean reduction % of FAW larvae, The statistical analysis, illustrates there are significant differences between treatments in case of initial effect and mean general reduction % the results were summarized that the compound Indoxacarb recorded highly initial effect 84 %  after 24 hours from the first and second application, while the Emamectin benzoate compound recorded 76.66 and 74.5 % reduction in case of residual effect and mean general % reduction.