There is a reduction in this production rate of guava cultivation since last few years as the fruit cultivation has been adversely affected by different varieties of fruit flies (Bactrocera spp.) infesting different orchards in different areas of Uttar Pradesh. These insect pests severely damage the guava fruits, rendering them unfit for consumption and off-market. In this research, we have carried rigorous investigations in the various orchards of Saharanpur district of Uttar Pradesh state of India, for a course of five months (October-February) over a time duration of three years (2021-2023) to identify the complexity of species of fruit flies that are causing harm to significant guava types including Allahabad Safeda, Chittidar, Arka Mridula and Harijha. The capturing process was conducted using self-made traps of plastic material coated with parapheramone, methyl eugenol, as fruit fly attractant placed in various guava orchards. In this research a total of 247, 251.8 and 272.6 mean number of fruit fly species were captured during 2021, 2022 and 2023 respectively. The findings showed that out of eight total fruit fly species captured during the season four, namely Bactrocera dorsalis, B. zonata, B. Correcta and B. tau belonging to the genus Bactrocera, were significantly overrepresented in all these varieties of guava with mean numbers (per month) 99.8, 73.8, 42.4 and 22.4 respectively for the year 2021 and 102.4, 71.2, 48.8 and 15.8 for the year 2022 and 125.8, 83.8, 40.6 and 14 for the year 2023. Allahabad Safeda was recorded with the highest mean number of fruit flies captured numbering approximately 129.82 per month followed by Arka Mridula, Chittidar and Harijha numbering 76.18, 23.70 and 17.13 per month respectively. Subsequently, for the next two years 2022-2023 Allahabad Safeda variety was again recorded with highest number of fruit flies captured numbering 130.61 and 121.94 followed by the rest of three with mean numbers 73.26, 29.24, 18.69 (2022) and 75.91, 34.81, 39.94 (2023) respectively.