The carob moth Ectomyelois ceratoniae Zell (Lep: Pyralidae), is one of the most important factors in reducing the quantity and quality of the pomegranate in Iran. Releasing Trichogramma wa ( Trichogramma .) to parasite the eggs are a common method to control this pest. In this research performance of these wa in the biological control and damage reduction of carob moth were assessed in pomegranate orchard with a Trichogramma release program based on the plant protection organization protocol and orchards without this program in Isfahan Iran. These orchards located in Najaf-Abad, Shahreza, Kashan and Shahin-shahr and they selected based on types of irrigation; Flood and drip irrigation. Orchards were sampled every two weeks during spring to autumn in 2015 and 2016 and parasitism percentage, number of larvae in infected fruit and damaged fruits were determined. Results showed that parasitism percentage is very low, but were significantly affected by season of wasp release, location of orchard, irrigation types and egg location on fruit. So that the highest and lowest percentage of egg parasitism were happening in September and July, respectively, and the highest and lowest average of egg parasitism percentage was occurred in the orchards of Kashan (44.31) just in 2016 and orchards of Najaf-Abad (0.97) in 2016, respectively. Parasitism was observed to be in this range for orchards of Shahin-Shahr and Shahreza. In most areas, reduce amount infection in the end of season in orchards with Trichogramma release program were higher than orchards without this program, But this reduction was not affected by release of Trichogramma , but was due to better manage orchards with wasp release program than orchards without this program. Parasitism percentage in orchards with flood irrigation were more than in orchards with drip irrigation system, But due to better management of orchards with drip irrigation system, reduce amount infection and damage were higher in the orchards. Field surveys and laboratory experiments showed that carob moth oviposition and their egg parasitism were higher in crack of fruits than crown of fruits. The factors contributing to the success of biological control, such as quality of released wa based on biological control agents guideline and emergence of wa in the orchard by using egg‘s traps and control of tricocards in the orchard were determined. The results showed that the rates of wasp emergence were low in all of release program and the rates of wasp emergence were decreased in duration of release program. Also, the emergence of released wasp was higher than in orchards with flood irrigation compared to orchards with drip irrigation system. Host preference of Trichogramma wasp in laboratory experiments showed that when wa reared on the flour moth eggs, they prefer flour moth eggs than the carob moth eggs, but carob moth eggs were preferred by wa that reared on grain moth eggs. Our results showed that Trichogramma realase program based on plant protection organization protocol is not effective method in reduce damage of carob moth in pomegranate orchards of Isfahan. Keywords: Pomegranate, Egg parasitoid, Trichogrammatidae, Pyralidae