In Egypt. S. myopeeformis is a serious pest in apple orchards. Lan. vae were reared on its natural host and artificial medium diet containing apple saw dust. Number of larvae and pupae completed their develop­ment, percentage of pupation, larva and pupa durations, rate of moth emergence, mating, oviposition, longevity, incubation period and per­centage hatchability were studied in details on natural host and artificial diet. The approximated life cycle was 97.6 (91 - 102) days on natural host and 56.8 (53 - 61) days on artificial medium diet. Out of 100 eggs reared on their natural host plant (apple) or artificial diet, 22 and 42 completed their development to adult moths, respectively. Rearing S myopeeformis on artificial diet reduced the total life cycle 1/2 than rear­ing on their natural host.