Abstract: Research was conducted to determine the effect of Coccinellid predators and plant phenology on the population dynamics of Macrosiphum rosaeiformis Das (Aphididae: Homoptera) in the University of Arid Agriculture Rawalpindi from 5th November 2000 to 15th April 2001. The rose aphid population was peaked in the month of January 2001. Rose aphid population was negatively correlated with Coccinellids predators. Rose aphid preferred the tender portion of plant especially flowers and flower buds causing deformation and discolouration. The resistance of four varieties i.e. Ice White, Sarabande, Lake Como and Iceburg (Rosa indica: Rosaceae) was studied against rose aphid. None of variety had resistance against rose aphid to significantly reduce their population.